Lubrication mechanisms of plasma-sprayed Cr₂O₃-Ag nanocomposite coatings were studied by using ball-on-disk friction tests against tungsten carbide counterface at temperatures ranging from 25 to 500 °C. The Cr₂O₃-Ag nanocomposite coatings were fabricated from agglomerated granules of chromium oxide and silver nanoparticles by plasma spraying process under optimized parameters. The presence of semi-molten nanoparticle zones within the coating promoted a sliding wear behavior characterized by plastic deformation of nanostructured ceramic matrix coatings. The formation of a silver-rich tribofilm on top of the contact surface and tribodecomposition of Cr₂O₃, as well as tribo-oxidation of Ag at the sliding interface were found to be the controlling mechanisms of friction in these coatings at moderate to high temperatures. The lowest coefficient of friction (COF) at all temperatures was obtained for the Cr₂O₃-5 vol. % Ag coating due to the optimum condition of its silver-rich tribofilm.

通过在 25 至 500 °C 的温度范围内对碳化钨配合面进行球盘摩擦试验，研究了等离子喷涂 Cr ₂ O ₃ -Ag 纳米复合涂层的润滑机制。Cr ₂ O ₃ -Ag 纳米复合涂层是由氧化铬和银纳米颗粒的团聚颗粒通过等离子喷涂工艺在优化参数下制备的。涂层内半熔融纳米颗粒区域的存在促进了滑动磨损行为，其特征是纳米结构陶瓷基体涂层的塑性变形。接触表面上富银摩擦膜的形成和 Cr ₂ O _{3 的}摩擦分解以及在滑动界面上 Ag 的摩擦氧化被发现是这些涂层在中高温下摩擦的控制机制。Cr ₂ O ₃ -5 体积在所有温度下的摩擦系数（COF）最低。% Ag 涂层由于其富含银的摩擦膜的最佳条件。