Tungsten Carbide Button Gradient Structure Optimization

The top layer of gradient cemented carbide contains WC much to resist abrasion. The middle layer contains an amount of Co, so it has good toughness. This structure is beneficial for drilling, which has larger impact loads and longer working life. For instance, using φ45mm drill bit with DP55 cone button in limestone tunnel drilling, the average working life of gradient structure is 3121m at 1.96m/min compare with the ordinary 1000m at 1.48m/min. Many researchers overseas proves that the amount of carbon practical needs 0.1% -0.4% lower than theoretical value, and an appropriate increase in carburizing temperature conducive to migrate to the liquid Co sintered body inside. In addition, the different size of the sintered body should choose different respective carburizing time.

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