PTFE/7075铝合金镶嵌型自润滑材料的摩擦学行为
Tribological Behavior of PTFE/7075 Aluminium Alloy Embedded Self-lubricating Composite
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摘要: 采用模压/烧结工艺制备了PTFE/7075铝合金镶嵌型自润滑复合材料,在往复式摩擦磨损试验机上进行了摩擦磨损试验,用扫描电镜观察了复合材料磨损后的表面形貌,并探究了其磨损机理.结果表明:在试验条件下,稳态后摩擦温度为51 ℃,摩擦因数为0.087,磨损率为0.38 ×10-3 mm3/(Nm),和非镶嵌型PTFE基复合材料相比,导热性和耐磨性大大提高,而摩擦因数无明显增加;稳定磨损阶段主要表现为粘着磨损,同时伴有轻微磨粒磨损,磨损后期局部呈现疲劳特征.Abstract: PTFE/7075 aluminium alloy embedded self-lubricating composite was prepared by compression mould/sintering technique.Friction and wear properties of the composite were evaluated in a reciprocating tribometer.To study the worn surfaces,SEM was used.The composite was superior to un-embedded composite in thermal conductivity and wear resistance.In the steady state,friction temperature and wear rate of the composite was 51 ℃ and 0.38×10-3 mm3/(Nm),and its friction coefficient was about 0.087,only changed slightly.Wear mechanism in the stable wear period was characterized by adhesion and slight abrasion.In the later period,local fatigue appeared.