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Chromium carbide: chromium carbide composite powder and its application in the metallurgical industry?

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2022-07-05 11:46

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Chromium carbide composite powder and its application in metallurgical industry?
Among the many carbides, only tungsten carbide and chromium carbide are used as thermal spraying materials in industry. In the application field of thermal spraying technology, aviation, power generation and automobile manufacturing are three important sectors. The latter's coatings are widely used in power generation, metallurgy and aviation systems. The research and development of thermal spraying materials is based on the urgent needs of these related industries in China. What are the chromium carbide composite powders and their applications in the metallurgical industry?
Chromium carbide composite powder and its application in metallurgical industry?
1. Chromium carbide composite powder is composed of two components with different properties. Among them, the alloy has good heat resistance, corrosion resistance and high melting temperature. Among them, chromium carbide is a common and important one. These chromium carbides have the characteristics of strong oxidation resistance in metal carbides. They only begin to oxidize significantly in the air at high temperature. They still maintain high hardness at high temperature. Chromium carbide also has strong corrosion resistance and wear resistance, it is 30 times that of stainless steel in dilute sulfuric acid solution and 50 times that of alloy in steam. When spraying power plant boiler pipes, the service life of the pipes is prolonged due to the wear of the pipe wall.
2. Usually, the coating formed by thermal spraying is used as the binder phase of heat-resistant alloy, and its hardness is close to that of chromium carbide, which constitutes an excellent high-temperature and wear-resistant material. Using ion spraying technology, the alloy and ceramic can have sufficient conditions to form a uniform metal ceramic coating, which has the functions of wear resistance, erosion resistance, cavitation resistance and high-temperature micro-vibration. At the same time, it is also resistant to high temperature gas and even sulfur-containing gas corrosion and high temperature oxidation. Typical applications are: coal-fired boiler tubes, power plants, paper mills, metallurgical annealing furnace rollers, thermoforming molds, hydraulic machine valves, combustion rod mandrels, turbines Gas sealing ring, wind damper, internal nozzle bracket, pump sleeve, hot crushing roller, piston guide rail, shift fork, compressor gas seal, telescopic joint, etc.
What is the structure and composition of chromium carbide composite powder?
1. Chromium carbide, as a thermal spraying material, has different structures and compositions. The structure can be divided into mixed type and coating type. The former is mixed as a component according to the requirements of a certain particle size and weight. This type of chromium carbide composite powder has been used for many years and still occupies an important position. Coated powder appeared in the early 1980 s, it is a composite powder that uses chemical and metallurgical methods to coat the alloy and chromium carbide together. This powder reduces the possibility of loss during the spraying process, making the coating highly homogeneous and uniform in texture.
2. The composition of chromium carbide composite powder mainly refers to the ratio between the two components. The nickel-chromium alloy itself is usually made of chromium carbide, and the content of chromium carbide alloy can be increased from 0 to 50. With the increase of chromium carbide, the toughness of the coating increases, but the hardness decreases, and the wear resistance is poor. Only the ratio of two components is just right, and the coating is resistant to high temperature.


Chromium carbide

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