Effect of the Addition of Ti₃SiC₂ on Mechanical and Friction/Wear Properties of Ag-Matrix Composites

Ag-MoS₂-graphite and Ag-MoS₂-graphite-Ti₃SiC₂ composites were prepared by hot-pressing method. The relative density, hardness, bending strength and the properties of friction and wear of the composites in both air and vacuum environment were investigated. It is found that the density and bending strength of the composite decreased after the introduction of Ti₃SiC₂ particulates because of the occurrence of pores at the interface between Ti₃SiC₂ and matrix. However, the addition of Ti₃SiC₂ had a negligible effect on the hardness of the composite. The friction coefficient of Ag-MoS₂-graphite-Ti₃SiC₂ was higher than Ag-MoS₂-graphite without respect of environment. This can be attributed to the three body abrasive effect of detached Ti₃SiC₂ particles which hampered the formation of solid lubricating layer. However, the wear resistant of the composite in air was improved obviously after incorporation of Ti₃SiC₂ particles due to the generation of oxides of copper.