The sintered polycrystalline diamond compacts (PDC) can be used in drilling in outer space with its excellent tribological properties such as low friction coefficient and high wear resistance. However, an unsatisfactory adhesion resistance behavior should be brought to the forefront, which may be the main factor resulting in the failure of PDC under vacuum environment. Consequently, we make the first attempt at improving the vacuum tribological behaviors of PDC. The effects of annealing on the vacuum tribological behavior of PDC are discussed in view of experimental studies using complementary analytical techniques (Raman, SEM&EDS, AFM). Raman spectra revealed that the degree of graphitization of PDC was increased with the temperature. The wear mechanism of the PDC under vacuum condition varied from adhesion to the abrasive wear when the annealing temperature was increased from 25 °C (RT) to 700 °C in ambient air. It was found that the friction coefficient of the compacts under vacuum can be minimized to lower than 0.015, while the wear can hardly be seen. Therefore, the vacuum tribological behavior of PDC can be largely improved after annealing treatment.

中文翻译：

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经高温退火处理的烧结多晶金刚石复合片真空摩擦学性能的改善

烧结聚晶金刚石复合片（PDC）以其低摩擦系数和高耐磨性等优异的摩擦学性能可用于外太空钻孔。然而，令人不满意的抗粘附行为应该被摆在首位，这可能是导致真空环境下 PDC 失效的主要因素。因此，我们首次尝试改善 PDC 的真空摩擦学行为。根据使用互补分析技术（拉曼、SEM&EDS、AFM）的实验研究，讨论了退火对 PDC 真空摩擦学行为的影响。拉曼光谱表明，PDC 的石墨化程度随着温度的升高而增加。当退火温度在环境空气中从 25 °C (RT) 增加到 700 °C 时，真空条件下 PDC 的磨损机制从粘附到磨料磨损。发现真空下压坯的摩擦系数可以最小化到低于0.015，而几乎看不到磨损。因此，经过退火处理后，PDC 的真空摩擦学行为可以得到很大的改善。