Presentation of the equipment's characteristics

Aluminum alloy cold spraying equipment is mainly composed of four parts: cold spraying host system, powder feeding system, industrial dust collection system, and booster system. It can meet the application needs of industrial on-site cold spray repair, surface modification, etc. of aluminum and aluminum alloy materials, saving the cost of industrial application of cold spraying.

processed samples

Equipment advantages
1. Portable operation: easy to move and operate;
2. High coating quality: coating bonding strength>35MPa, porosity<2%, can be repaired on site

Technical advantages
1. Low spraying temperature, little influence on material structure, little thermal influence,
2. High spraying efficiency, high utilization rate of spraying materials, no oxidation in the preparation of organic coating, dense coating, low porosity.
3. Mobile online repair, integrated explosion-proof dust removal, safe and reliable, fast and portable, low-temperature operation;

Application range
Mainly used for remanufacturing and surface strengthening of parts such as aluminum alloy, copper alloy and stainless steel, and preparation of ceramic and aluminum alloy composite materials.

Equipment ParametersValue
Spraying Pressure0.5～1.2MPa
Gas Heating Temperature300～600℃
Powder Feeding Rate3～15kg/h
Spraying Distance5～15mm
Cold spray principle diagram
Cold spray metal 3D printing

Cold spraying is a powder deposition method that uses the self-consolidation ability of solid powder particles to achieve mutual bonding of particles. This self-consolidation of powder can only be achieved under high-speed impact conditions. With the research on cold spraying process equipment and spraying process, some shortcomings of cold spraying have been gradually overcome, and its application field has gradually expanded.

Cold spraying technology is a coating preparation method invented by Papyrin and others from the Institute of Theoretical and Applied Mechanics of the former Soviet Academy of Sciences in the mid-to-late 1980s. Studies have found that when the powder spraying speed exceeds a certain critical value, the powder will be deposited on its surface to form a coating after colliding with the substrate. As a result, they proposed the concept of cold spraying in 1990 and published the first paper on cold spraying. Subsequently, cold spraying technology has gradually attracted people’s attention due to its preparation advantages, and has developed rapidly in the field of material surface coating preparation technology. At the same time, researchers have also carried out the development of cold spraying equipment, the research on coating deposition principles and coating structure and properties, which has played a positive role in promoting the development and application of cold spraying technology.

Cold spray technology is a new type of spraying technology based on the principle of aerodynamics. It uses compressed gas to drive powder particles through the Laval convergent nozzle to accelerate them, so that the supersonic powder particles collide with the substrate to undergo plastic deformation and deposit on the substrate surface to form a coating. According to the spraying air pressure and powder feeding method, cold spray equipment can be mainly divided into high-pressure (1.5~4.0MPa) and low-pressure (0.6~1.5MPa) cold spray. The high-pressure cold spray equipment system mainly uses N2, He or a mixture of the two as the gas source. Its high-pressure gas circuit and powder flow pipeline are independent of each other. The spray powder enters from the front end of the convergent nozzle, mixes with the hot air flow inside the nozzle, and is accelerated and sprayed out through the convergent nozzle. The equipment system is relatively large and is mostly fixed. In addition, the spraying temperature of the equipment is relatively high (200~800℃), and the spraying powder speed can reach 300~1200m/s; the coating deposition rate is high, the structure is uniform and dense, and large-area coatings can be quickly prepared; but at the same time, there are also disadvantages such as large gas and powder consumption, high spraying economic cost, and difficult equipment transportation.

In theory, cold spray technology can prepare almost all metal and metal/ceramic composite coatings with a thickness of more than 50pm, and the cold spray deposition layer can effectively prevent high temperature, corrosion, erosion, oxidation and chemical corrosion. It is currently widely used in aerospace, automotive, energy, medical, marine and other fields and shows unique advantages in the field of additive manufacturing technology.