Fabrication and Properties of Infiltration Type High Temperature Self-lubricating Metal Ceramics Composites

A infiltration-type high temperature self-lubrication metal ceramics composite was fabricated by infiltrating molten solid lubricant Pb-Sn-Ag-RE into TiC/FeWCrMoV microporous metal ceramic preforms using vacuum high pressure infiltration composite methed.Influences of fabricating parameters on infiltrating qualities and mechanical properties of the composites were discussed,and the best technology was determined.Friction and wear properties of the composites were investigated using high temperature friction and wear tester.The microstructure and the worn surface morphology of the composites were analyzed by means of scanning electron microscopy and energy dispersive X-ray analyzer.The results indicate that the optimal sintering process was holding 60 min at 1 230℃ and the optimal infiltrating process was under the pressure of 5 MPa,holding time of 60 min and infiltration temperature of 750℃.The high temperature self-lubrication composites with interpenetrating net works could be obtained which were composed of metal ceramic hard phase and multi-lubricant soft phase.The composites possessed high obdurability,wear resistance and high temperature tribology properties when the lubricant volume fraction was above a certain quantity(>13%).