材料期刊网

采用粉末冶金方法制备石墨/二硫化钼增强镁基自润滑复合材料,并分别表征这些复合材料的显微组织、物理性能、力学性能和磨损性能.利用XRD手段鉴定复合材料中的Gr/MoS 2相.显微组织观察表明,Gr/MoS 2颗粒均匀地分散在镁基体中.在室温条件下施加载荷5 g并保持15 s,测试复合材料的显微硬度,得到所有复合材料的显微硬度为VHN 29?34.使用显微硬度、拉伸和压缩试验研究材料的力学性能,并用扫描电子显微镜分析材料的断口形貌,得到Mg?10MoS 2复合材料最高的硬度、抗压强度和拉伸强度.用销?盘式摩擦仪测试烧结复合材料的摩擦因数和磨损量.另外,通过磨损表面特征,利用SEM系统分析复合材料的摩擦磨损机制.结果表明,与石墨相比,二硫化钼的摩擦因数和磨损有所减少.

The graphite (Gr)/MoS2 reinforced Mg self-lubricating composites were prepared through powder metallurgy. The composites were characterized for microstructure, physical, mechanical and wear properties. Gr/MoS2 phase in the composites was identified by XRD analysis. Microstructural observation showed that the Gr/MoS2 particles were homogeneously dispersed within the magnesium matrix. Micro-hardness was measured using an applied load of 5 g with a dwell time of 15 s at room temperature. Hardness of all the composites was measured to be in the range of VHN 29?34. The mechanical properties were studied using micro-hardness, tensile and compression tests. A fractographic analysis was performed using scanning electron microscope. The highest values of hardness, compressive strength and tensile strength were attained using Mg?10MoS2 composite. A pin-on-disk tribometer was used to measure the friction coefficient and the wear loss of the sintered composites. In addition to that, the friction and wear mechanism of the composites were systematically studied by worn surface characterization and wear debris studies using SEM analysis. The reduced friction coefficient and wear loss were achieved in MoS2 rather than Gr.