Cold spray technology has developed from a specialized coating process into an advanced platform for metal deposition, component repair and additive manufacturing. Unlike conventional thermal spray and fusion-based metal additive manufacturing, cold spray does not rely on fully melting the feedstock. Instead, solid powder particles are accelerated to high velocities and impact a substrate with sufficient kinetic energy to produce severe plastic deformation and solid-state bonding.

This distinctive deposition mechanism gives cold spray several important advantages, including low thermal input, limited oxidation, minimal heat-affected zones and the ability to build relatively thick metallic deposits.

Today, cold spray is used for protective coatings, dimensional restoration, repair of high-value components and cold spray additive manufacturing (CSAM). Different equipment architectures—including low-pressure cold spray, high-pressure cold spray and specialized vacuum cold spray systems—have been developed for different materials and manufacturing requirements.

This article explains the origin and working principle of cold spray technology, particle deposition mechanisms, the differences between low- and high-pressure cold spray equipment, suitable materials, equipment costs and major industrial applications.

What Is Cold Spray Technology?

Cold spray, also known as cold gas dynamic spray (CGDS), is a solid-state material deposition process in which fine powder particles are accelerated by a high-velocity gas stream and directed toward a substrate.

The process normally uses a converging-diverging nozzle, commonly referred to as a De Laval nozzle, to convert the pressure and thermal energy of compressed gas into high gas velocity.

Powder particles carried by the gas stream are accelerated toward the substrate. When the impact velocity and material conditions are suitable, the particles undergo intense plastic deformation and form a bonded deposit.

The feedstock generally remains in the solid state during deposition.

This distinguishes cold spray from processes that rely on melting and solidification.

Modern cold spray technology can be divided into three broad application areas:

• Cold spray coating for protective and functional surface layers.
• Cold spray repair and remanufacturing for dimensional restoration and localized material replacement.
• Cold spray additive manufacturing for building thick deposits, features and near-net-shape components.

As deposition thickness, process control and automated motion capabilities have improved, the boundary between cold spray coating and additive manufacturing has become increasingly broad.

The Origin and Development of Cold Spray Technology

The modern cold spray process originated from gas-dynamic research conducted in the Soviet Union during the 1980s.

Researchers studying high-velocity two-phase flows observed that fine solid particles accelerated in a gas stream could accumulate on a target surface under specific impact conditions.

This was an important discovery.

At lower or unsuitable impact conditions, particles could rebound from or erode the target. However, once suitable material and velocity conditions were reached, particles began to adhere and form a deposit.

Subsequent research focused on understanding:

• particle acceleration,
• critical impact velocity,
• gas pressure and temperature,
• nozzle geometry,
• powder characteristics,
• substrate response,
• and particle-to-particle bonding.

Early industrial cold spray applications were primarily associated with coatings. The technology was particularly attractive because metallic material could be deposited without the extensive thermal exposure associated with conventional thermal spray or fusion processes.

As high-pressure gas systems, powder feeders, nozzle technology and automated motion systems improved, cold spray expanded into component repair and material build-up.

This development ultimately led to cold spray additive manufacturing, where controlled deposition is used to create substantial three-dimensional metallic structures.

How Does Cold Spray Technology Work?

A cold spray system converts compressed gas energy into particle kinetic energy.

Although equipment configurations vary, the fundamental process normally includes gas supply, gas heating, powder feeding, particle acceleration, impact and progressive deposit formation.

1. Compressed Gas Supply

Compressed gas enters the cold spray system.

Depending on the process and equipment configuration, the gas may be:

• compressed air,
• nitrogen,
• helium,
• or a controlled gas mixture.

Nitrogen is widely used in industrial cold spray because of its availability and balance between performance and operating cost.

Helium can provide greater particle acceleration under suitable conditions because of its gas properties. However, helium consumption can significantly increase process cost.

Low-pressure systems may use compressed air for selected materials and repair applications.

2. Gas Heating

The process gas passes through a gas heater.

Heating the gas does not necessarily mean melting the powder.

Instead, increasing gas temperature changes gas properties and can improve expansion and particle acceleration through the nozzle.

Gas temperature is therefore an important process parameter.

The required temperature depends on:

• gas type,
• powder material,
• particle size,
• equipment pressure,
• nozzle geometry,
• and required particle velocity.

Industrial systems may operate across very different gas temperature ranges. Higher gas temperature does not automatically mean a higher-quality deposit; it must be coordinated with the complete process window.

3. Powder Feeding

Metal or composite powder is introduced into the gas flow.

Stable powder feeding is essential for consistent deposition.

Important powder characteristics include:

• particle size distribution,
• morphology,
• apparent density,
• flowability,
• oxygen content,
• surface condition,
• and mechanical properties.

The powder feeding architecture also differs between cold spray systems.

In many high-pressure cold spray systems, powder is introduced upstream of the nozzle throat under pressurized conditions.

In many low-pressure systems, powder is introduced into the downstream or diverging region of the nozzle.

This difference affects equipment architecture, powder feeder pressure requirements and particle acceleration behavior.

4. Acceleration Through a De Laval Nozzle

The gas and particles pass through a converging-diverging nozzle.

The gas accelerates as it expands through the nozzle. Under appropriate operating conditions, the gas flow can reach supersonic velocity.

The solid particles are accelerated by interaction with the high-speed gas.

Particle velocity is influenced by:

• gas pressure,
• gas temperature,
• gas molecular weight,
• particle diameter,
• particle density,
• nozzle length,
• nozzle expansion ratio,
• and powder injection position.

The gas velocity and particle velocity should not be treated as identical.

Particles have mass and inertia and therefore respond differently to the accelerating gas flow.

5. High-Velocity Particle Impact

The accelerated particles leave the nozzle and strike the substrate.

This is the critical stage of cold spray deposition.

If the particle velocity is insufficient, the particle may rebound without forming a stable bond.

At suitable impact conditions, the particle experiences extremely rapid deformation.

The particle flattens against the substrate or previously deposited particles, while intense localized strain develops at the interface.

6. Particle Bonding and Deposit Formation

Cold spray bonding is a complex solid-state phenomenon.

Severe plastic deformation, interfacial disruption, localized heating, high strain rates and material flow all contribute to successful deposition.

Surface oxide layers and contaminants can be disrupted during impact, allowing more intimate contact between materials.

The exact bonding mechanism varies with the particle and substrate materials.

For this reason, cold spray should not be described simply as particles being mechanically “stuck” to a surface.

A successful cold spray deposit develops through repeated high-energy particle impacts and progressive consolidation.

What Is Critical Velocity in Cold Spray?

Critical velocity is one of the fundamental concepts in cold spray technology.

For a specific powder and substrate combination, particles generally need to reach a sufficient impact velocity before effective deposition can occur.

Below the required deposition condition, particles may:

• rebound,
• produce surface deformation,
• remove surface material,
• or generate erosion.

Once suitable particles reach or exceed the effective critical velocity, severe deformation can promote bonding.

However, critical velocity is not a single universal value.

It depends on:

• particle material,
• substrate material,
• particle temperature,
• particle diameter,
• particle morphology,
• oxidation state,
• mechanical strength,
• impact angle,
• and substrate surface condition.

For example, a process window suitable for relatively ductile aluminum powder cannot simply be transferred to titanium, nickel alloys or stainless steel.

There can also be an upper practical velocity limit. Excessive impact energy may increase erosion, particle fragmentation or undesirable process behavior in certain material systems.

The objective is therefore to establish an appropriate deposition window, rather than simply maximizing particle velocity.

How Does a Cold Spray Coating Form?

Cold spray deposit formation is a progressive process.

It can be broadly understood through four stages.

Stage I: Initial Adhesion and First-Layer Formation

The first particles impact the substrate.

Successful particles deform and establish initial bonding with the substrate surface.

The quality of this first layer is particularly important because it forms the interface between the original component and the cold spray deposit.

Surface preparation and substrate condition can significantly influence this stage.

Stage II: Particle Deformation and Realignment

Additional particles impact the first deposited layer.

Previously deposited particles may undergo further deformation as new particles strike them.

Particle arrangement changes and the deposit begins to grow.

At this stage, individual particle boundaries can still be clearly present within the developing structure.

Stage III: Particle Bonding and Void Reduction

Continuous particle impact causes further deformation and consolidation.

Particles fill available spaces and the number and size of internal voids can decrease.

Particle-to-particle bonding becomes increasingly important.

The deposit becomes denser as additional layers accumulate.

Stage IV: Further Deformation and Work Hardening

Particles in the existing deposit continue to experience repeated impact from incoming material.

This can produce additional deformation and work hardening.

The final microstructure and mechanical properties depend on the powder, impact conditions, deposit thickness and subsequent processing.

For some demanding applications, post-deposition heat treatment or other post-processing may be used to modify the deposit microstructure and properties.

How Do Impact Angle and Stand-Off Distance Affect Deposition?

Particle velocity alone does not determine cold spray deposition efficiency.

The impact angle is also important.

When particles strike the substrate under favorable near-normal impact conditions, a greater proportion of particle kinetic energy acts toward the surface.

This generally supports deformation and deposition.

As the impact becomes increasingly oblique, more particles may deflect from the surface.

This can increase the quantity of undeposited powder and reduce deposition efficiency.

This is particularly important when processing:

• curved surfaces,
• complex geometries,
• internal features,
• corners,
• and components with changing surface orientation.

Robot path planning must therefore consider more than nozzle position.

The nozzle angle relative to the local surface can directly influence process stability.

Stand-Off Distance

Stand-off distance is the distance between the nozzle exit and the substrate.

If the distance is inappropriate, particle velocity and spray distribution at the substrate may change.

The optimal stand-off distance depends on:

• nozzle design,
• gas conditions,
• powder material,
• particle size,
• and application geometry.

For automated cold spray, nozzle angle and stand-off distance should be controlled throughout the programmed deposition path.

Why Is It Called “Cold” Spray?

The term cold spray is relative to thermal spray and fusion-based manufacturing technologies.

The process gas can be heated to several hundred degrees Celsius and some advanced systems use even higher gas temperatures.

However, the powder does not need to undergo bulk melting before deposition.

This is the fundamental difference.

In processes such as plasma spray or laser directed energy deposition, substantial thermal energy is involved in heating or melting the feedstock.

Cold spray relies primarily on particle kinetic energy.

Because the material is deposited in a solid state, cold spray can reduce problems associated with melting and resolidification, including:

• extensive oxidation,
• solidification cracking,
• elemental segregation,
• large heat-affected zones,
• and thermal distortion.

This is why cold spray can be particularly attractive for reactive metals, heat-sensitive substrates and high-value components.

Low-Pressure vs High-Pressure Cold Spray

Cold spray equipment is commonly divided into:

• Low-Pressure Cold Spray (LPCS)
• High-Pressure Cold Spray (HPCS)

The distinction is not based on pressure alone.

The two systems can differ in gas supply, powder injection, heating capacity, particle velocity, material compatibility and intended application.

It is important to note that there is no single global pressure value that universally separates LPCS and HPCS equipment.

Classification can vary between technical literature and equipment manufacturers.

Therefore, pressure data should always be evaluated together with gas type, powder injection architecture, particle velocity and material capability.

Low-Pressure Cold Spray Systems

A Low Pressure Cold Spray System is typically designed for compact operation, localized deposition and cost-effective surface repair.

A representative LPCS architecture may include:

• compressed air or gas supply,
• gas heater,
• pre-chamber,
• powder feeder,
• De Laval nozzle,
• pressure control,
• and mobile equipment platform.

Depending on the system, powder may be introduced into the diverging section of the nozzle.

Representative low-pressure equipment can operate with gas pressures around the 10 bar class, although actual specifications vary by system.

Advantages of Low-Pressure Cold Spray

Compact and Portable

LPCS equipment can be integrated into a relatively small mobile platform.

This is particularly valuable for field maintenance and workshop repair.

Lower Equipment Investment

Lower-pressure components and simplified gas infrastructure generally reduce equipment cost.

Lower Gas Consumption

Compared with large HPCS systems, compact LPCS equipment can require substantially lower gas flow.

Suitable for Localized Repair

Operators can process selected worn or damaged areas without installing the component in a large automated manufacturing cell.

Suitable for Selected Ductile Materials

LPCS is commonly associated with selected:

• aluminum,
• copper,
• zinc,
• and metal-composite powders.

Powder engineering and ceramic reinforcement can also be used to modify deposition behavior for certain applications.

Limitations of LPCS

Low-pressure cold spray has a narrower processing window for materials requiring high critical velocities.

Limitations may include:

• lower deposition efficiency,
• limited difficult-alloy capability,
• lower particle acceleration,
• greater dependence on powder design,
• and reduced suitability for high-performance structural CSAM.

LPCS should therefore be selected according to the actual material and repair requirement.

It is not simply a smaller HPCS machine.

High-Pressure Cold Spray Systems

A High Pressure Cold Spray System uses higher gas pressure and more advanced gas heating and powder feeding equipment to achieve greater particle acceleration.

A typical industrial system may include:

• high-pressure gas supply,
• precision pressure regulation,
• high-capacity gas heater,
• high-pressure powder feeder,
• De Laval nozzle,
• cold spray gun,
• gas and powder monitoring,
• HMI control system,
• industrial robot or CNC motion system,
• and application-specific safety equipment.

Representative industrial HPCS systems can operate at pressures up to approximately 50 bar or more, depending on the equipment design.

Particle velocities can extend from several hundred metres per second to above 1,000 m/s under suitable system and material conditions.

These figures are representative process ranges rather than universal specifications for every cold spray machine.

Advantages of HPCS

• Higher particle velocity
• Wider material processing capability
• Higher deposition efficiency
• Dense metallic deposits
• Thick material build-up
• Advanced component repair
• Robotic process integration
• Cold spray additive manufacturing

High-pressure cold spray becomes particularly valuable when the manufacturing objective moves from a thin functional coating toward substantial material addition.

Vacuum Cold Spray Technology

In addition to conventional atmospheric cold spray, specialized vacuum cold spraying systems have also been developed.

A typical vacuum cold spray system may integrate:

• gas supply,
• powder feeder,
• particle classifier,
• spray nozzle,
• vacuum chamber,
• vacuum pump,
• process control system,
• and X-Y-Z motion stage.

The controlled chamber environment changes gas-flow and particle-transport conditions.

Vacuum-based spray systems are particularly relevant to specialized powder and functional material research.

However, vacuum cold spray should not be treated as a direct replacement for conventional industrial HPCS or LPCS.

The equipment architecture and application objectives can be substantially different.

For most large industrial component repair and CSAM applications, atmospheric high-pressure or low-pressure cold spray systems remain the primary equipment categories.

How Much Does Cold Spray Equipment Cost?

There is no universal cold spray equipment price.

A compact low-pressure cold spray system and a robotic high-pressure CSAM system are fundamentally different manufacturing platforms.

Why Does LPCS Cost Less?

Low-pressure equipment generally uses:

• lower-pressure gas infrastructure,
• smaller heaters,
• simpler powder feeders,
• compact controls,
• and fewer automation components.

A portable system may also operate manually without an industrial robot.

Why Is HPCS More Expensive?

High-pressure systems may require:

• pressure-rated gas components,
• high-capacity heating,
• high-pressure powder feeding,
• precision process control,
• advanced nozzle systems,
• gas monitoring,
• robotic integration,
• CNC motion control,
• and safety engineering.

The selected process gas also affects operating cost.

Helium can improve particle acceleration in certain applications, but helium consumption may represent a significant operating expense.

For this reason, equipment prices should be evaluated according to the application.

A manufacturer depositing aluminum for localized repair does not necessarily need the same system as an aerospace organization developing titanium or nickel-based CSAM processes.

Materials Suitable for Cold Spray

Material suitability depends strongly on plastic deformation behavior and the achievable particle impact conditions.

Aluminum and Aluminum Alloys

Aluminum is one of the most widely studied and applied cold spray material families.

Applications include:

• dimensional restoration,
• corrosion repair,
• aerospace component repair,
• protective coatings,
• and additive manufacturing.

Its relatively favorable deformation behavior makes many aluminum systems attractive for cold spray.

Copper and Copper Alloys

Copper cold spray is important for electrical and thermal applications.

Typical applications include:

• conductive coatings,
• heat transfer structures,
• electrical contacts,
• thermal management,
• and additive manufacturing.

Avoiding complete melting can help retain desirable material characteristics in properly developed processes.

Titanium and Titanium Alloys

Titanium is important in:

• aerospace,
• defense,
• biomedical engineering,
• and advanced manufacturing.

Because titanium can require high particle impact conditions, HPCS is generally more relevant for demanding titanium deposition.

Powder oxygen content, particle condition and post-processing are important considerations.

Nickel and Nickel-Based Alloys

Nickel-based materials are attractive for corrosion-resistant and high-performance applications.

Their higher mechanical strength can make deposition more demanding.

High-pressure systems and optimized gas conditions are therefore often required.

Magnesium Alloys

Magnesium components can be expensive and difficult to repair using conventional fusion techniques.

Cold spray can selectively restore damaged regions with limited thermal input.

This makes magnesium component repair particularly relevant to aerospace applications.

Stainless Steel and Steel Materials

Cold spray research and industrial development include:

• stainless steel coatings,
• dimensional restoration,
• functional surfaces,
• and additive manufacturing.

Higher critical velocity requirements can make steel deposition more demanding than softer metals.

Zinc

Zinc is suitable for selected corrosion protection applications.

Its relatively favorable deformation characteristics make it relevant to low-pressure cold spray.

Metal Matrix Composites

Cold spray feedstock can incorporate reinforcing phases such as:

• Al₂O₃,
• SiC,
• WC-based constituents,
• and other ceramic particles.

Ceramic particles may influence powder flow, surface activation, deposition behavior and final wear properties.

However, brittle ceramics generally cannot be treated in the same way as ductile metallic particles.

The metallic matrix normally plays an important role in deposit formation.

Industrial Applications of Cold Spray Technology

Aerospace and Aviation

Aerospace is one of the most important cold spray markets.

Aircraft components can experience:

• corrosion,
• dimensional loss,
• localized wear,
• surface damage,
• and mechanical degradation.

Replacing a complete high-value component may be extremely expensive.

Cold spray enables material to be selectively added to damaged regions.

Applications include:

• magnesium gearbox housing repair,
• aluminum structural component restoration,
• dimensional recovery,
• driveshaft and housing repair,
• titanium deposition,
• and feature restoration.

The limited thermal influence of cold spray is particularly attractive when the original component microstructure must be protected.

Defense

Cold spray can support maintenance and restoration of high-value defense components.

Portable LPCS systems are attractive for selected field repair applications, while automated HPCS equipment can be used for engineered component restoration.

Applications include:

• corrosion damage repair,
• dimensional rebuilding,
• localized material addition,
• and life extension.

Energy and Power Generation

Cold spray can be used for:

• corrosion protection,
• conductive coatings,
• dimensional restoration,
• component repair,
• and functional material deposition.

Advanced copper alloy deposition is also being investigated for high-performance energy and propulsion applications.

Electronics and Electrical Engineering

Copper, aluminum and other conductive materials make cold spray relevant to electrical manufacturing.

Applications include:

• conductive tracks,
• electrical contacts,
• electromagnetic shielding,
• metallization,
• and thermal management structures.

Cold spray can also deposit metal onto selected temperature-sensitive substrates.

Automotive and New Energy Vehicles

Potential applications include:

• lightweight alloy repair,
• battery-related components,
• copper deposition,
• electrical structures,
• functional coatings,
• and thermal management.

The increasing use of aluminum and copper in electric vehicles creates new opportunities for solid-state deposition technologies.

Marine Industry

Cold spray can support:

• corrosion protection,
• aluminum component restoration,
• dimensional repair,
• and localized surface rebuilding.

Process and material selection must consider the final marine environment.

Oil and Gas

Cold spray can be considered for selected:

• corrosion-resistant coatings,
• dimensional restoration,
• component repair,
• and functional surface applications.

The deposited material must be selected according to the actual pressure, temperature, corrosion and wear environment.

Medical and Biomedical Engineering

Cold spray research also covers biomedical surface engineering.

Potential applications include:

• metallic surface functionalization,
• implant-related coatings,
• and specialized material deposition.

The relatively low thermal input can be advantageous for selected material systems.

Cold Spray Additive Manufacturing and Repair

Cold spray is no longer limited to thin coatings.

By continuously depositing material and controlling nozzle movement, thick structures can be produced layer by layer.

This is known as cold spray additive manufacturing (CSAM).

Cold Spray Additive Manufacturing

CSAM can be used for:

• near-net-shape components,
• thick-wall structures,
• feature addition,
• freeform deposition,
• large metallic structures,
• and hybrid manufacturing.

Because CSAM does not create a conventional melt pool, it follows a fundamentally different metallurgical route from laser DED and powder bed fusion.

Deposited components may require:

• heat treatment,
• hot isostatic pressing,
• machining,
• or other post-processing,

depending on the required final properties.

Cold Spray Repair and Remanufacturing

Cold spray can restore material only where material has been lost.

Typical repair objectives include:

• dimensional recovery,
• worn surface restoration,
• corrosion damage repair,
• localized material addition,
• and rebuilding features before final machining.

For high-value components, this can reduce the need for complete replacement.

Cold Spray vs Laser Directed Energy Deposition

Cold spray and laser DED are both material addition technologies, but their physical mechanisms are fundamentally different.

Neither process is universally better.

Cold spray is attractive when:

• thermal input must be minimized,
• rapid material build-up is required,
• and the material can be effectively deposited through high-velocity impact.

Laser DED is attractive when:

• metallurgical fusion is required,
• complex deposition paths are involved,
• a broad range of engineering alloys must be processed,
• and precise repair or additive manufacturing is required.

The two technologies are complementary.

Cold Spray vs Thermal Spray

Conventional thermal spray processes use thermal energy to heat, soften or melt feedstock materials.

Cold spray relies primarily on kinetic energy.

This fundamental difference influences:

• oxidation,
• phase stability,
• coating thickness,
• substrate heat input,
• and deposit microstructure.

Cold spray offers important advantages for metallic deposition and thick material build-up.

However, thermal spray remains highly important for:

• ceramic coatings,
• thermal barrier coatings,
• wear-resistant coatings,
• and established surface engineering applications.

Process selection should always be based on the required coating function and material.

Advantages of Cold Spray Technology

The major advantages of cold spray include:

• Solid-state material deposition
• Minimal heat-affected zone
• Reduced oxidation
• Limited thermal distortion
• High deposition rates
• Thick deposit capability
• Repair and dimensional restoration
• Dissimilar material opportunities
• Additive manufacturing potential
• Robotic and CNC integration

Limitations of Cold Spray Technology

Cold spray also has important limitations.

Material-Dependent Critical Velocity

Different materials require different impact conditions.

Difficult Hard and Brittle Materials

Materials with limited plastic deformation capability can be difficult to deposit.

Gas Consumption

Industrial HPCS systems can consume substantial quantities of process gas.

Helium Cost

Helium-based processing can significantly increase operating costs.

Nozzle Wear

Powder and operating conditions can cause nozzle degradation.

Geometry and Impact Angle

Complex surfaces can make it difficult to maintain an optimal nozzle angle and stand-off distance.

Residual Stress and Work Hardening

Repeated high-velocity impact can generate residual stresses and significant deformation within thick deposits.

Post-Processing

Machining and thermal post-processing may be required for demanding applications.

These limitations demonstrate why successful cold spray manufacturing requires coordinated development of the powder, gas parameters, nozzle, equipment, motion path and post-processing route.

How to Choose a Cold Spray System

Choose a Low Pressure Cold Spray System when:

• portability is important,
• field repair is required,
• selected ductile materials are used,
• coating or localized restoration is the primary objective,
• and equipment investment must be controlled.

Choose a High Pressure Cold Spray System when:

• higher particle velocity is required,
• advanced alloys must be processed,
• high deposition performance is required,
• thick deposits are needed,
• aerospace component repair is involved,
• or cold spray additive manufacturing is the primary objective.

Before selecting equipment, manufacturers should evaluate:

1. Substrate material
2. Powder material
3. Particle size and morphology
4. Required deposit thickness
5. Required deposition efficiency
6. Bonding and mechanical properties
7. Component geometry
8. Nozzle accessibility
9. Production rate
10. Process gas availability
11. Automation requirements
12. Post-processing requirements
13. Final service environment

The correct system should be selected around the application—not pressure alone.

Cold Spray Equipment and Additive Manufacturing Solutions from Greenstone

Greenstone provides advanced material deposition, component repair and additive manufacturing solutions for industrial applications.

Our cold spray technology portfolio covers two primary equipment configurations.

Low Pressure Cold Spray System

The Low Pressure Cold Spray System is a compact and flexible platform for selected coating, surface restoration and localized repair applications.

Its mobile equipment architecture is suitable for applications requiring:

• portability,
• process accessibility,
• localized deposition,
• and cost-effective operation.

The system can be configured according to the powder material, repair objective and operating environment.

Cold Spray Additive Manufacturing System

The Cold Spray Additive Manufacturing System is an integrated high-pressure cold spray platform for advanced material deposition, thick coatings, component restoration and CSAM.

Depending on the application, the system can integrate:

• high-pressure gas control,
• gas heating,
• precision powder feeding,
• cold spray gun and nozzle technology,
• HMI process control,
• robotic or CNC motion,
• and automated system integration.

Greenstone can support material evaluation, process development, sample testing, equipment configuration and automated system integration for cold spray coating, repair, remanufacturing and additive manufacturing projects.

Conclusion

Cold spray has evolved from an unexpected high-velocity particle deposition phenomenon into an important solid-state manufacturing technology.

Its fundamental advantage is not simply that the process operates at a lower temperature.

The real technological difference is that cold spray uses particle kinetic energy and severe impact deformation to achieve material deposition without requiring bulk melting of the feedstock.

Low-pressure cold spray provides a compact and economical solution for selected coating and localized repair applications. High-pressure cold spray extends the process toward higher particle velocities, broader material capability, advanced component restoration and cold spray additive manufacturing.

However, pressure alone does not determine process performance.

Particle material, critical velocity, gas temperature, nozzle geometry, impact angle, stand-off distance, substrate condition and progressive particle consolidation all influence the final deposit.

For industrial manufacturers, the correct question is therefore not simply:

Which cold spray machine has the highest pressure?

The more important question is:

Which material, process window and equipment configuration can produce the required deposit and final component performance with the lowest technical and production risk?

This application-driven approach is the foundation of reliable cold spray coating, component repair and additive manufacturing.

GST-CS-800 High Pressure Cold Spray System

The GREENSTONE GST-CS-800 High Pressure Cold Spray System is an integrated industrial platform developed for cold spray coating, component repair, surface restoration and cold spray additive manufacturing applications.

The complete system consists of a main control cabinet, powder feeder, cold spray gun, gas heating and water cooling system, and HMI control unit. Its modular architecture enables coordinated control of gas pressure, gas temperature, powder feeding and spray parameters for stable and repeatable deposition.

Technical Specifications

Integrated Process Control

The GST-CS-800 uses a PLC-based control architecture with touchscreen HMI operation. The system integrates the main control unit, powder feeder and gas heating system into a coordinated process platform.

Operators can set and monitor key cold spray parameters through the HMI. Process data for different materials and deposition conditions can be configured and stored, supporting repeatable process development and production.

Automatic safety monitoring and alarm functions are integrated into the control system to supervise critical operating conditions.

Gas Heating and Water Cooling System

The gas heating system uses a dedicated high-power heater to rapidly heat the process gas. The heating unit supports gas temperatures of up to 800°C, with a maximum output current of 630 A and maximum output voltage of 45 V.

A PID-based temperature control system provides a control accuracy of approximately ±5°C under appropriate operating conditions.

The integrated water cooling system uses a 25 L water tank, provides a maximum cooling water temperature of 10°C, and supports a cooling water flow rate of up to 5.4 m³/h.

Real-time water level monitoring, cooling circuit protection and temperature control help protect the heating and electrical components during continuous operation.

Precision Powder Feeding System

The GST-CS-800 is equipped with a rotary powder feeding system driven by a servo motor.

The powder feeder supports a rotational speed range of approximately 0–30 r/min, enabling stable and adjustable powder delivery for different cold spray materials and process requirements.

The system is designed for metallic and metal-based composite powders and features a compact mobile structure for easier system integration and maintenance.

High Pressure Cold Spray Gun

The cold spray gun is the core deposition component of the GST-CS-800 system and integrates the high-pressure gas inlet, powder feeding interface, temperature and pressure monitoring, and nozzle assembly.

The gun body is manufactured from high-strength stainless steel and incorporates an internal water-cooling structure for improved thermal stability and service life.

The nozzle assembly uses a replaceable design and can be configured with different nozzle geometries according to the powder material and deposition process. The system supports both automatic cold spray processing and manual spray operation.

Through optimized nozzle and process configurations, the GST-CS-800 can be adapted for materials including aluminum alloys, copper alloys, nickel-based materials, titanium alloys and selected metal composite powders.

Custom Cold Spray Equipment and Processing Services

GREENSTONE can configure the GST-CS-800 High Pressure Cold Spray System according to the customer’s powder material, component geometry, coating requirements and production objectives.

In addition to custom cold spray equipment, we provide cold spray processing, component repair, process development and sample testing services. Customers can submit drawings, material information, components or technical requirements for process evaluation and cold spray sample development.

Contact GREENSTONE to discuss your cold spray coating, repair or additive manufacturing application.