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RISS 인기검색어
- 검색키워드
- 저자 : 부휘휘 (검색결과 2 건)
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Wear properties of hybrid metal matrix composites : 하이브리드 금속복합재료의 마모특성
부휘휘 Graduate School Changwon National University 2002 국내박사
The purpose of this study is to investigate the wear properties of Saffil/Al, Saffil/Al_2O_3/Al and Saffil/SiC/Al hybrid metal matrix composites fabricated by squeeze casting method. Wear tests were done on a pin-on-disk friction & wear tester under both dry and lubrication conditions. The wear properties of the three composites were evaluated in many respects. The effects of Saffil, Al_2O_3 particles and SiC particles on the wear behavior of the composites under lubricated condition were elucidated. Wear mechanisms were analyzed by observing the worn surfaces of the composites. The variation of coefficient of friction (COF) during the wear process was recorded by using a computer. Under dry sliding condition, Saffil/SiC/Al showed the best wear resistance under high temperature and high load, while the wear resistances of Saffil/Al and Saffil/Al_2O_3/Al were very similar. Under dry sliding condition, the dominant wear mechanism was abrasive wear under mild load and room temperature, and the dominant wear mechanism changed to adhesive wear as load or temperature increased. Molten wear occurred at high temperature. Comparing with the dry sliding condition, all three composites showed excellent wear resistance when lubricated by liquid paraffin. It was found that hard particles were destructive to the wear resistance of aluminum MMCs under lubricated sliding. Saffil/Al showed the best wear resistance under lubricated condition because there were no hard particles acting as abrasives, and its COF value was the smallest. Under high temperature, Saffil/SiC/Al showed excellent wear resistance because of the SiC particles. The dominant wear mechanism of the composites under lubricated condition was microploughing, but microcracking also occurred to them to different extents
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