K-1008 SiCとNi_3Al粒子強化アルミ複合材の真空中のフレッティング磨耗特性(J04-2 フレッティング摩耗と疲労(2))(J04 フレッティング摩耗と疲労)

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Fretting friction and wear of aluminum alloy, 5 and 10 vol.% SiCp/Al and Ni_3Alp/Al composites under 5×10^<-4> Pa vacuum was investigated. Wear mechanism in vacuum was compared with that in atmosphere at different applied load of 1, 2 and 3 N. The effect of particles and volume fraction was also studied. The coefficient of friction in vacuum reached to stable after only 10-100 cycles and kept unchanged for Al alloy and its composites. However, that in atmosphere was increased with the increased cycles. The value at 10^5 cycles in vacuum was smaller than that in atmosphere about 0.1 to 0.2. Incorporating SiC particles into the Al alloy matrix increased coefficient of friction, especially at low loads of 1 and 2 N. The wear resistance of Al alloys was improved by dispersion of large volume fraction of SiC particle. Ni_3Alp/Al composites did not show the improved wear resistance because of the poor quality of ingot. Wear volume of Al alloy and its composites in vacuum was smaller than that in atmosphere. However, the maximum wear depth was the converse. This is because the abrasive wear due to ferric oxide was hampered by vacuum, the deformation layer was deeper in vacuum. The counterface of the ball suffered large amount of wear volume when against composites of larger volume percentage.
2001-08-22