Effect of removing internal residual metallic phases on wear resistance of polycrystalline diamond compacts |
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| Affiliation: | 1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, PR China;2. Key Laboratory on Deep Geo-drilling Technology of the Ministry of Land and Resources, China University of Geosciences (Beijing), Beijing 100083, PR China;1. Element Six UK Ltd, Global Innovation Centre, OX11 0QR, Harwell Oxford, UK;2. University College Dublin, School of Mechanical & Materials Engineering, Dublin, Ireland |
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| Abstract: | 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. |
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