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Hard Alloy Chemical

Hangzhou JWG Technology Co.Ltd | Updated: Oct 26, 2017

Carbide is composed of cobalt (Co) or nickel (Ni), molybdenum (Mo) as the binder in the vacuum furnace or hydrogen (WC), which is the main component of carbide (WC, TiC) Reduction furnace sintered powder metallurgy products. ⅣB, ⅤB, Ⅵ B metal carbides, nitrides, borides, etc., due to the hardness and melting point is particularly high, collectively referred to as cemented carbide. The following carbide to focus on the hard to explain the structure, characteristics and applications. Carbide manufacturers ⅣA, ⅤA, ⅥA metal and carbon formed by the metal carbide, because the carbon atom radius is small, can be filled in the metal character of the gap and retain the original metal lattice form, the formation of gap solid solution. Under suitable conditions, such solid solution can continue to dissolve its constituent elements until it reaches saturation. Therefore, their composition can vary within a certain range (for example, the composition of titanium carbide varies between TiC0.5 and TiC), and the chemical formula does not conform to the valence rules. When the dissolved carbon content exceeds a limit, the tin carbide (for example, Ti: C = 1: 1 in titanium carbide), the lattice type will change, the original metal lattice into another form of metal lattice , Then the filling solution is called intercooled compounds.

Metal carbide, especially ⅣB, ⅤB, Ⅵ B metal carbide melting point of 3273K or more, of which hafnium carbide, tantalum carbide were 4160K and 4150K, is the currently known material in the highest melting point. Most of the carbide hardness is very large, their micro hardness greater than 1800kg · mm2 (microhardness is one of the hardness that is used for hard alloy and hard compounds, the hardness of 1800kg · mm2 equivalent to a Diamond a hardness of 9). Many carbides are not easily decomposed at high temperatures, Suzhou Cemented Carbide has stronger antioxidant capacity than its constituent metals. Titanium carbide in all carbides in the best thermal stability, is a very important metal carbide. However, in the oxidizing atmosphere, all carbides are easily oxidized at high temperatures, which can be said to be a major weakness of carbides

In addition to carbon atoms, nitrogen atoms, boron atoms can also enter the metal lattice of the gap, the formation of inter-filling solution. They are similar to the nature of the interstitial carbides, can be conductive, thermal conductivity, high melting point, hardness, and brittleness is also large. The matrix of the cemented carbide consists of two parts: one is the hardened phase and the other is the bonded metal. Shanghai hard alloy hardening phase is the periodic table of transition metal carbide, such as tungsten carbide, titanium carbide, tantalum carbide, their hardness is high, the melting point of more than 2000 ℃, and some even more than 4000 ℃. In addition, transition metal nitrides, borides, silicides also have similar characteristics, can also act as hard alloy hardening phase. The presence of the hardened phase determines that the alloy has extremely high hardness and abrasion resistance.

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