Tungsten Carbide Additives (1/2)

Tungsten carbide (WC-Co) consists of the hard phase WC and the binder Co, it has higher hardness, high strength, high melting point and excellent wear resistance, which can be widely used in cutting tools, molding and drilling industries. However, with the expanding application and more and more complex conditions, tungsten carbide with WC-Co system can not entirely meet the requirements of the working performance. Tungsten carbide additives appear to effectively solve this problem, different additives can be suitable for different properties of tungsten carbide required.

For instance, in order to suppress the grain growth, the grain growth inhibitors can be used (TaC, MoC, VC); in order to improve the density, toughness and other properties, we can add the corresponding rare earth elements; in order to improve the corrosion resistance of tungsten carbide, we can add some ingredients of corrosion resistance. A relatively small amount of additives, will not have a greater impact on the original carbide other properties, but can significantly improve a certain desired properties, which is an ideal solution.

Theoretically, the finer tungsten carbide WC grain size (micron scale to submicron scale, even nanometer scale), its product density, hardness, fracture toughness, impact toughness will be remarkably improved. But correspondingly to prepare tungsten carbide with smaller granularity, its specific surface area larger and surface activity greater and it easily grows during the sintering process, so the grain growth inhibitors plays a important role. There are several major additive inhibitory effects: VC> Cr3C2> NbC> TiC> Mo2C> TiC> ZrC> HfC.

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