Effect of removing internal residual metallic phases on wear resistance of polycrystalline diamond compacts

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• 作者：Chengliang Liu ^{liuchengliang8888@yahoo.cn} ; Zili Kou ; Duanwei He ; Ying Chen ; Kaixue Wang ; Bo Hui ; Rui Zhang ; Yanfei Wang
• 关键词：High temperature wear resistance ; Residual metal removal depth ; PDC
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：31
• 期：Complete
• 页码：187-191
• 全文大小：1288 K

文摘

Internal residual metal phases (mainly cobalt) were effectively removed from polycrystalline diamond compacts (PDCs) by electrolysis to improve their high temperature wear resistance. Through turning granite (dry cutting), we have checked the wear resistance of PDCs with different residual metal removal depth (RMRD). The relationship between the measured wear rate and RMRD was obtained, and the results showed that PDCs treated by electrolysis have a significant improvement in wear resistance. X-ray diffraction (XRD) and scanning electron microscopy (SEM) observation of PDCs' wear surface indicated that diamond-graphite phase transformation occurs for the samples with residual metal phase. The wear mechanism is discussed, and our study suggests that the graphitization is the main wear process of PDCs with internal residual metal phases.