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Application of titanium carbide in coating materials

wallpapers News 2020-05-13
Titanium carbide for coating materials

1) Diamond coating: The manufacturing method of diamond tools is mainly the powder metallurgy impregnating method. Since diamond is a non-metal, it has high interface energy with general metals or alloys, so that low melting point metals or alloys cannot infiltrate the diamond surface, and its bonding performance is reduced. In recent years, many scholars have strengthened the bonding strength between diamond and metal matrix. A lot of research has been done. The most widely used method is the active metal method, that is, a small number of active metals such as titanium, chromium, and vanadium are added to the metal binder. When the tool is sintered in the liquid phase, because the active metal is a high carbon compound forming element, it has a large affinity for diamond and is easy Enriched to the diamond surface, so as to achieve metallurgical bonding of diamond and metal binder. However, the interface strength is affected by parameters such as the amount of active metal added and the sintering temperature and time and requires the melting of the binder to achieve the enrichment of the active metal to the interface, because this method is not suitable for the hot pressing of the solid phase of diamond and metal powder in a short time sintering.

 
Based on the above reasons, many scholars hope to seek other ways to improve the bonding strength between the diamond surface and the metal matrix. A large number of studies have found that the metal or alloy is formed by the physical or chemical plating of certain strong carbides on the diamond surface. At high temperatures, it can interact with the carbon atoms on the surface of the diamond to form stable metal carbides. These carbides (such as C), on the one hand, have a good bond with the diamond surface, on the other hand, they can be well carcass metal The infiltration can significantly enhance the adhesion between diamond and carcass metal. Depositing a layer of titanium carbide on the tool can increase the service life of the tool by 3-5 times.

2) Coating of electrical contact materials; TiC has broad application prospects in new composite electrical contact materials. According to statistics, at present, the silver used for contact materials in the world accounts for one-quarter of the total silver consumption. Whether the performance of silver-based composite materials can be further improved and their silver content decreased is a common concern of material workers. The silver-tungsten contact material has been widely used since it came out in 1935, but the silver-tungsten contact has unstable contact resistance, and the temperature gradually increases during use. This is due to the contact surface during the breaking process. The tungsten in the material oxidizes and forms tungsten trioxide and insulating tungstate.

3) Roadhead pick coating: TiC also plays an important role in improving the lives of the cutting head pick of the roadheader. The pick is a part that directly contacts the rock during tunneling, and its life directly affects the driving efficiency. S100, The picks of EBJ160 and other roadheaders have the disadvantages of low hardness, poor abrasion resistance, large friction coefficient, poor corrosion resistance, and poor thermal conductivity. The application of vacuum measurement and sputtering titanium carbide film technology can solve the above problems. The hardness of the pick is close to the diamond, and the service life is increased by 3-5 times.

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Tag: Titanium car