铝/石墨复合材料高速高温下的摩擦磨损特性

本文研究了用中间法新工艺制造的铝石墨复合材料在高速高温下的摩擦磨损特性。试验在销盘式试验机上进行。滑动线速度最高达9.4米/秒。在2米/秒干摩擦时,所有测试的复合材料磨损量均小于基体合金。200℃时,含石墨2～5%的复合材料磨损量也此基体合金小。在9.4米/秒干摩擦时,含石墨2%的复合材料耐磨性能最好。以前曾有报导:滑动线速度大于1米/秒,铝石墨复合材料的磨损量大于基体合金12,13]。本文认为新工艺制造的复合材料在9.4米/秒的高速摩擦时摩擦系数和磨损量下降是由于石墨与基体界面结合良好。 

Friction and Wear Behavior of Graphite Partiele/Al Composites at High Sliding Speed and High Temperature

The friction and wear characteristics of Al-graphite particle composites prepared by a new method using a graphite rich master alloy were evaluated with a pin-on-disc machine under high temperature condition at the sliding speed up to 9.4m/sec.At the sliding speed of 2m/sec under dry condition the wear rates of all the composites tested were lower than the matrix.At 200℃, the wear rates of the composites containing 2-5% graphite decreased.At the sliding speed of 9.4m/sec the composite containing 2% graphite was the moat wear resistant of the composites and alloys studied.It was reported before that the friction coefficients and wear rates of Algraphite particle composites were higher than the matrix when the sliding speed was greater than 1 m/sec12, 13].The reduction in wear rates and friction coefficients of the composites at high sliding speed of 9.4m/sec with respect to the matrix alloy wear was attributed to the strong graphite-matrix interfacial bond of the composites prepared by the new method.