WEAR REDUCTION BY PYROLYTIC CARBON ON TRIBOSURFACES

被引:9
作者
LAUER, JL
VLCEK, BL
SARGENT, BL
机构
[1] Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy
基金
美国国家科学基金会;
关键词
D O I
10.1016/0043-1648(93)90535-T
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Sliding tests with a pin-on-disc tribometer and both sliding and rolling tests with a modified four-ball tester at bulk temperatures of about 500-degrees-C and initial contact pressures of about 2.2 GPa have demonstrated up to 80% reductions of friction and wear with silicon nitride surfaces when a stream of ethylene is directed into the conjunction region. The effects are even more pronounced when the ethylene is prenucleated by a flow over a coil of nichrome wire electrically heated to about 800-degrees-C and located about 30 cm upstream of the exit nozzle. Steel and Ni-plated steel are lubricated by this method even more efficiently and at lower temperatures. The underlying mechanism is probably analogous to that of hydrocarbon pyrolysis by flash photolysis, which was studied by Porter in the 1950s, with the rapid heating to the ''flash temperatures'' and subsequent cooling occurring naturally in friction contacts. The observation that pyrolysis of hydrocarbons to solid carbon occurs in two stages, nucleation and particle growth, has allowed their physical separation, the former taking place in the ethylene stream and the latter in the frictional contact some distance away.
引用
收藏
页码:498 / 507
页数:10
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