摘要
通过热压烧结制备了MoSi2及3种MoSi2基复合材料,考察了其相组成和结构,测定了其硬度和断裂韧性,评价了其摩擦磨损行为,并探讨了力学性能、摩擦界面特性和偶件材料特性等对MoSi2及其复合材料摩擦学行为的影响.结果表明:MoSi2同GCrl5钢和WC-Co硬质合金配副时表现出较高的摩擦系数,其磨损强烈依赖于偶件材料特性;第二相的引入对MoSi2的磨损行为具有显著影响,其中SiC第二相可以改善MoSi2的摩擦磨损性能;摩擦界面特性和偶件材料特性则对MoSi2及其复合材料的摩擦磨损性能具有决定性影响.
Monolithic MoSi2 and three kinds of MoSi2based composites were prepared by hotpress and sintering in a medium frequency induced oven. The phase compositions and microstructures of the monolithic MoSi2 and its composites incorporated with second phase B4C, SiC, or Ag/ZrO2 were examined by means of Xray diffraction and scanning electron microscopy. The hardness and fracture toughness of MoSi2 and its composites were measured, while their friction and wear behaviors sliding against SAE52100 steel or WCCo hard alloy at ambient conditions evaluated on a ballondisk tribometer. Moreover, the effects of mechanical properties, frictional interfacial nature, and the counterpart material properties on the tribological behaviors of MoSi2 and its composites were discussed. Findings indicated that MoSi2 had high friction as it slid both the steel and the hard alloy counterparts. The introduction of a second phase in MoSi2 played an important role in controlling the friction and wear behaviors of the MoSi2based composites. The tribological behaviors of MoSi2 and its composites were greatly dependent on the frictional interface nature and the counterpart material properties.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2003年第5期361-366,共6页
Tribology
基金
:国家自然科学基金资助项目(50023001).
