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采用溶胶-凝胶法制备氧化铝颗粒增强的钼基复合材料。测定了钼基体的显微硬度;用SEM,TEM及XRD分别对混合粉体与坯体进行了微观分析;用销盘式摩擦磨损试验机测定了复合材料的滑动磨损性能。结果表明:在复合粉体及其材料中,Al2O3作为分散相具有细化晶粒的作用,随氧化铝体积分数增加,钼基体显微硬度增加,复合材料摩擦系数缓慢降低,磨损量先增加后减少,一定程度上改善了材料的磨损性能。
Preparation of Molybdenum Matrix Composites Reinforced by Alumina Particles by Sol - Gel Method. The microhardness of the molybdenum matrix was measured. The microstructure and microstructure of the powder and the green body were analyzed by SEM, TEM and XRD respectively. The wear behavior of the composites was evaluated by the pin-plate friction and wear tester. The results show that Al2O3 as the disperse phase has the function of grain refinement. With the increase of the volume fraction of alumina, the microhardness of the molybdenum matrix increases, the friction coefficient of the composite decreases slowly, and the wear amount increases first Reduce, to a certain extent, improve the wear performance of the material.