Abstract
Wear resistance of the rock drill bit is one of the important factors affecting drilling efficiency and exploration cost. Hence, the development of tool materials with high wear resistance has been widely concerned by researchers. The composites of cemented carbides and Ti-coated diamond (Ti/Dia) were successfully prepared by spark plasma sintering with excellent wear resistance. The characterization of microstructure and phase composition revealed that diamond particles distributed homogeneously without obviously graphitization. With 2–6 wt% Ti/Dia, the relative density, hardness and flexural strength of the composites were all improved. However, with the further increase in Ti/Dia content, the relative density and flexural strength sharply decreased. The composites with 2 wt% Ti/Dia shown the best wear resistance and the wear rate was reduced by 50 times compared with that of the sample without diamond addition. The diamond plays an important role in the rock cutting and grinding for the sample with 2 wt% Ti/Dia. However, for the samples with 18 wt% Ti/Dia, the cutting edge is easy to fracture and the diamond is more likely to pull-out whole because of the weak retention ability of the matrix to diamond.
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