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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。
Five samples of Co-Cu-Re alloy were smelted. When the content of Cu and Re is low, there are only two kinds of Co solid solution phase, the amount of Cu and Re amounts to 12.5 at .-%, and the solid solution phase of Cu and Re appears. The friction coefficient with temperature was measured by reciprocating high temperature pin-plate friction tester. Compared with Co, Co-Re and Cu-Re, the wear debris, surface oxides and Co-Cu-Re were determined by X-ray and energy dispersive spectroscopy Volatile structure, determination of debris and near-surface composition. The experimental results show that the reason why the friction coefficient of Co-Cu-Re alloy is as low as 0.15-0.20 at high temperature is that Re suppresses the phase transformation of Co and forms a lubricating film that contains volatile Re oxide film. The model of autogenous oxide film antifriction was designed.