稀土/MoSi_2复合材料的干摩擦磨损性能

Dry Friction and Wear Characteristics of Rare Earth/MoSi_2 Composite

运用M 2型摩擦磨损试验机测定了不同载荷条件下稀土 /MoSi2 复合材料与 45钢配对件的干摩擦磨损性能 ,采用SEM观察了摩擦副表面的形貌和X射线分析了磨屑相组成 ,并探讨了其磨损机制。结果表明 :稀土 /MoSi2 和MoSi2 与 45钢干摩擦时 ,在负荷不超过 15 0N的范围内 ,其摩擦系数 μ和磨损率W与负荷p间较好地满足关系式 :W(或 μ) =a +bp +cp2 +dp3+ep4 ;两种材料均具有优异的耐磨性能 ,在 80～12 0N范围 ,稀土 /MoSi2 复合材料的磨损率比纯MoSi2 材料的至少降低了 65 % ;稀土 /MoSi2

The dry friction and wear properties of rare earth/MoSi 2 composite against 45 steel under different loads were investigated by using an M 2 type friction and wear tester. SEM and XRD were used to analyze the morphology of the friction surface and the phase of the worn piece in order to reveal the wear mechanisms of rare earth /MoSi 2 composite. Results show that the relations of friction coefficient, μ , or wear rate, W , of MoSi 2 and RE/MoSi 2 composite to loads, p , can be fitted well by the following function: W or μ=a+bp+cp 2+dp 3+ep 4 , where a, b, c, d, e are the fitting constant depending on the material and the confidence, respectively. MoSi 2 and rare earth/MoSi 2 composite have excellent wear resistance. When load is at a load range of 80～120 N, the wear rate of rare earth/MoSi 2 composite is about 65% lower than that of MoSi 2 material. The main wear mechanism of rare earth/MoSi 2 composite is adhesive wear.