Tungsten Carbide Button Material Optimization (1/2)

Tungsten carbide button is mainly composed of tungsten carbide (WC) and cobalt (Co), which has excellent wear resistance and impact toughness. Compared with similar products, it has a higher rate of drilling. Drill bits series has passivity long life cycle, which does not wear life is about the same diameter drill bit grinding edge leader once life 5-6 times, will help save the auxiliary work, reduce manual workers and improve the efficiency. Tungsten carbide button usually used in shearer drilling, tunneling, mining machinery tools and road sweeping snow removal and road maintaining tools so that it required perfect hardness and wear resistance. In order to improve tungsten carbide button properties, it can be improved in two ways. One is to optimize the material, includes grain refinement, structure optimization and trace elements adding, another is to optimize the preparation process.

Grain refinement refers to the crystallization of ultrafine particles even nano crystallization. The studies have shown that the content of binder phase in the cemented carbide under the same circumstances, WC grain size of less than 1μm, hardness and strength carbide buttons remarkably improved. So the researchers speculate that further refinement of the WC grain size, the effect will be more remarkable. Nano-crystalline carbide grain has small grain size, larger surface area and high surface reactivity. The experiments have prepared different sizes of WC powder 84% WC-15% Co-1% VC carbide ball gear tested and found that nano-crystalline carbide button required minimum sintering temperature, has the best hardness, strength, resistance wear resistance and impact toughness, which is beneficial for  overall efficiency and extending the service life.

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