金刚石因其高硬度和耐磨性而被广泛用于材料的抛光、磨削和切割。然而，目前将聚晶金刚石（PCD）的其他独特性能用于滑动磨损应用的应用相对较少。本文介绍了对PCD和其他轴承材料进行滑动磨损试验的结果。介绍了PCD在井下泥浆马达推力轴承应用中的当前使用情况，显示了PCD的使用寿命延长。本文还简要介绍和讨论了其他应用。

DIAMOND IS USED WIDELY FOR THE POLISHING, GRINDING, AND CUTTING OF MATERIALS BECAUSE OF ITS HIGH HARDNESS AND WEAR RESISTANCE. HOWEVER, THERE ARE RELATIVELY FEW CURRENT APPLICATIONS WHERE THE OTHER UNIQUE PROPERTIES OF POLYCRYSTALLINE DIAMOND (PCD) ARE UTILIZED FOR SLIDING WEAR APPLICATIONS. THE RESULTS OF SLIDING WEAR TESTS PERFORMED ON PCD AND OTHER BEARING MATERIALS ARE PRESENTED. THE CURRENT USE OF PCD IN A DOWNHOLE MUD MOTOR THRUST BEARING APPLICATION IS COVERED, SHOWING THE EXTENDED LIFE WHICH IS ATTRIBUTED TO THE PCD. OTHER APPLICATIONS ARE BRIEFLY PROPOSED AND DISCUSSED.