摘要
冶炼了五种 Co-Cu-Re 合金样品。当 Cu 和 Re 含量较低时,只有两种结构的 Co 固溶体相,Cu 和 Re 量达12.5at.-%,出现 Cu 及 Re 的固溶相。用往复式高温销盘摩擦试验机测定摩擦系数随温度变化,并与 Co,Co-Re,Cu-Re 对比,用 X 射线及能谱测定磨屑、表层氧化物及 Co-Cu-Re 550℃挥发物结构,测定磨屑及近表层成分。试验结果表明,Co-Cu-Re 合金高温摩擦系数低至0.15—0.20的原因是,Re 抑制了 Co 的相变及形成易挥发的含 Re 氧化物膜起润滑作用。设计了自生氧化膜减摩作用模型。
The microstructure of Co-Cu-Re alloy was investigated byX-ray diffraction and electron microprobe analysis.The solid solutions of Cuand Re were found in alloy containing high content of Cu,Re(more than 10at.-%),apart from two main structure phases of Co(Cu,Re).The dependenceof friction coefficient on temperature of Co-Cu-Re,Co-Re and pure Co weredetermined and compared by pin on flat reciprocating wear device.The com-position and structure of wear track,debris and subsurface as well as volatilesubstanc(?)s at 550℃ were examined by SEM-EDX and X-ray diffraction.It isconcluded that low friction coefficient of Co-Cu-Rc alloy results from theretardation of phase transformation h(?)p-fcc and formation of volatile oxides ofRe and Cu.The model of lubrication with naturally occuring oxide film hasbeen suggested.
基金
国家自然科学基金
85032
中科院与美国自然科学基金
