Tungsten Carbide Button Properties

Tungsten carbide button has good hardness (86 ~ 93HRA, equal to 69 ~ 81HRC), good heat hardness (reach 900 ~ 1000 ℃, keep 60HRC), good wear resistance and other excellent performances. It is a high hardness refractory metal carbides (WC, TiC) micron powder as a main component, cobalt (Co) or nickel (Ni), molybdenum (Mo) as a binder, in a vacuum furnace or a hydrogen reduction furnace sintered powder metallurgy products. ⅣB, ⅤB, ⅥB metal carbides, nitrides, borides, and so on called as cemented carbide, due to their particularly high hardness and melting point.

ⅣB, ⅤB, ⅥB metal and carbon consist of tungsten carbide, which can fill the voids in the metal lattice and retain the original metal lattice to form interstitial solid solution because of the small radius. Under appropriate conditions, such solid solutions will dissolve its elements gradually until saturated. When the dissolved carbon content exceeds the limit (eg. titanium carbide Ti︰C = 1︰1), the lattice pattern will be changed so that the original metal lattice changes into another form of the metal lattice, which called this solid solution mesenchymal compound.

Tungsten carbides button especially ⅣB, ⅤB, ⅥB melting point are more than 3273K. Most of carbide has great hardness (micro hardness is higher than 1800kg / mm2, equal to a Moh's hardness 9). They are difficult to break down at high temperatures, and have great antioxidant capacity than the metal component. However, all carbides are easily oxidized in an oxidizing atmosphere at high temperature actually, which is a distinct weakness of carbides.

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