SELF-LUBRICATING BEHAVIOR OF Fe-Re BINARY ALLOYS

ＳＥＬＦ－ＬＵＢＲＩＣＡＴＩＮＧＢＥＨＡＶＩＯＲＯＦＦｅ－ＲｅＢＩＮＡＲＹＡＬＬＯＹＳ￥Ｘｉｏｎｇ，Ｄａｎｇｓｈｅｎｇ；Ｌｉ，Ｓｈｉｚｈｕｏ；Ｊｉａｎｇ，Ｘｉａｏｘｉａ；Ｐｅｔｅｒｓｏｎ，ＭＢ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇｙＲｅｓｅａｒｃｈＩｎｓｔ...

The temperature dependences of the coefficients of friction and the wear rates of several Fe-Re alloys containing various Re contents were determined with a pin-on-disc high-temperature wear device. The examination, analysis and determination of the debris, the wear scars and the load-bearing oxide films were performed using SEM, X-ray diffractometer, electron probe and microhardness tester. The results showed that after high temperature sliding, there were formed surface glaze layers in the studied Fe-Re alloys, and the sub-surface layers were composed of ductile oxides and deformed matrix alloys. The presence of large amounts of iron oxides on the load-bearing oxide layers resulted in the high hardness platforms and the good high temperature wear,resistance of the alloys. The oxides of Re and Fe(ReO4)(3) present in the skeletons of iron oxides play the role of lubricating at high temperatures.