In high temperature environment, friction and wear are more likely to cause the failure of Polycrystalline diamond compact (PDC) by graphitization. PDC with cobalt removal (PDC-CR) and friction pairs (silicon nitride balls) were purposely selected for frictional wear experiments at temperatures of 200 °C, 300 °C, and 400 °C, respectively. Scanning electron microscope, energy spectrometer, X-ray diffractometer and metallographic microscope were employed to characterize the worn materials. The results showed that the friction coefficient and wear rate increased with the increase of wear temperature, resulting in a decrease in wear resistance. And no graphite phase was found by XRD, which proves that decobalt treatment can effectively inhibit the graphitization of polycrystalline diamond at high temperature. SEM images revealed that the increase of temperature is not conducive to the generation of friction transfer film which can increase the wear resistance of materials. Meanwhile, the surface layer of decobalt polycrystalline diamond composite sheet and friction pair will fall off, then form three-body abrasion.

中文翻译：

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PDC-CR在不同温度下的摩擦学行为

在高温环境下，摩擦磨损更容易导致聚晶金刚石复合片（PDC）石墨化失效。特意选择脱钴PDC（PDC-CR）和摩擦副（氮化硅球）分别在200℃、300℃和400℃温度下进行摩擦磨损实验。采用扫描电子显微镜、能谱仪、X射线衍射仪和金相显微镜对磨损材料进行表征。结果表明，随着磨损温度的升高，摩擦系数和磨损率增大，导致耐磨性能下降。并且通过XRD没有发现石墨相，证明脱钴处理可以有效抑制聚晶金刚石在高温下的石墨化。SEM图像显示，温度升高不利于摩擦转移膜的生成，从而提高材料的耐磨性。同时，脱钴聚晶金刚石复合片及摩擦副的表层会脱落，形成三体磨损。