Geological Engineering: Proceedings of the 1st International Conference (ICGE 2007)
47 Fabrication of Single Crystal Diamonds∕Cemented Carbide Composite Cutter for Rock Drilling
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This study investigated the fabrication method of single crystal diamond∕cemented carbide composite cutter for rock drilling. By adopting just right amount of phosphorus and nickel as sintering aid, the consolidation of diamond∕WC-Co composite was achieved by hot pressing the blended powder in vacuum at 1060°C for 5 min with a pressure of around 20MPa. The sintering temperature was relatively low so that the serious degradation of diamond grit was avoided. The hardness, wear ratio and impact strength of the composite were tested and the results indicated that the composite can meet the demand for rock drilling. The indoor drilling experiments using coring bits set with the prepared diamond∕WC-Co composite cutters were performed and the results indicated that the drilling rate was satisfactory when the rock drilled had a drill ability index of 4–6. Compared with the traditional polycrystalline diamond compact (PDC), the single crystal diamond∕WC-Co composite cutter was inexpensive and can be easily manufactured.