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       Tungsten carbide spraying technology has high hardness, wear resistance, high temperature resistance and corrosion resistance, and is widely used in aerospace, petroleum, metallurgy, machinery and other fields. In general industrial applications, we call it a cemented carbide coating, which is usually made of tungsten carbide/cobalt as raw materials, and supersonic spraying on the surface of nickel or iron-based materials to form a protective layer, which can increase the wear resistance of the substrate. and service life.



On the whole, the implementation cost of this type of process is not cheap, but the amount of money saved in terms of damage to the entire component and the overall replacement cost is considerable. In the field of aerospace engine research and development, surface strengthening coating is one of the most eye-catching technologies, and tungsten carbide is an important basic material for strengthening coating of aircraft parts.

With the rapid development of high-tech, the aviation industry has put forward various performance requirements for data from time to time. Cermet? Yes, but most of the metal ceramics mentioned by aviation are composite materials, and the process components are unknown, but most of them have added tungsten components, such as negative thermal shrinkage materials zirconium tungstate, tungsten aluminum ceramics, etc.


There are advantages and disadvantages, depending on the material. The existing coating processes include supersonic flame spraying tungsten carbide, hard chromium plating, physical vapor deposition tungsten carbide and explosive spraying tungsten carbide. While these applications have triumphed in some categories, each has its limitations.



Thermal spraying technology refers to the use of a certain heat source, such as electric arc, plasma arc, extinguishing flame, etc., to heat powder or filamentary metal and non-metallic coating materials to a molten or semi-molten state, and then use the power of the flame itself or externally. The high-speed airflow is atomized and radiated to the surface of the pretreated matrix material at a certain speed.



A technology that separates from the base material to form a surface covering coating with various functions. During the spraying process, the molten particles hit the surface of the substrate and spread into flakes, which are cooled and solidified instantly, and the subsequent particles hit the previously formed flakes from time to time to form a coating.

 

Thermal spraying technology can be divided into: atmospheric plasma spraying, supersonic plasma spraying, arc spraying, high-speed arc spraying, flame spraying, supersonic flame spraying, explosive spraying, cold spraying, etc. according to different heat sources. The general process of thermal spraying includes three basic processes, namely surface pretreatment, spraying and post-coating treatment.

 

Thermal spraying technology has the comprehensive advantages of low cost of coating preparation, high efficiency, simple and sensitive process, etc. The coating can be prepared with many functions, including wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, heat insulation, electrical conductivity, insulation, reduction It has been widely used in aviation, power generation, automobile and metallurgy, and has been paid more and more attention by the industry.

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