(装甲兵工程学院装备再制造技术国防科技重点实验室，北京 100072)
摘 要: 贵金属银具有优异的固体润滑性能，常被用于关键机械零部件表面硬质防护涂层的摩擦学改性。近年来，航空、航天等技术的发展进一步促进了含银硬质涂层在高温工况下的大量应用。贵金属银在含银硬质涂层中主要以银单质和银的二元金属氧化物AgTMxOy等形式发挥作用。阐述了银单质和AgTMxOy在硬质涂层中的高温自润滑机理，分析了银类润滑材料和其他固体润滑剂之间的协同作用，归纳了金属银在硬质涂层中的几点优异特性，即较快的扩散速率、较好的热化学稳定性和较弱的Ag—O键等；展望了含银硬质涂层的未来研究方向。
关键字: 贵金属银；AgTMxOy；硬质涂层；摩擦学性能；固体润滑
（National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China）
Abstract:Silver as noble metal is a reliable solid lubricant usually used in the hard and protective coatings of Key mechanical components to improve their tribological properties. Recently, the wide applications of silver-containing hard coatings in elevated temperature are accelerated strongly by the further development of aerospace industrial, especially. The element silver contained in hard coatings functions in the form of simple substance of Ag and Ag-based binary transition metal oxides (i.e. AgTMxOy). The main focus is on the high temperature self-lubricating mechanisms of simple substance of Ag and/or AgTMxOy when they are doped or oxidized in hard coatings. The excellent synergism between solid lubricants of simple substance of Ag and/or AgTMxOy and other lubricant components was analyzed. Then, several desirable characteristics of Ag element contained in hard coatings (faster diffusion rate, superior thermal and chemical stability and weaker Ag-O bond) were summed up when the coatings were under the condition of high temperature friction and wear testing. At last, the research prospect was put forward. This can provide a reference for the research and application of silver-containing hard coatings.
Key words: noble silver; AgTMxOy; hard coating; tribological property; solid lubrication
