材料期刊网

The non-lubricated, sliding friction and wear behavior of Ti3Si(Al)C-2 and SiC-reinforced Ti3Si(Al)C-2 composites against AISI 52100 bearing steel ball were investigated using a ball-on-flat, reciprocating tribometer at room temperature. The contact load was varied from 5 to 20 N. For monolithic Ti3Si(AI)C,, high friction coefficients between 0.61 and 0.90 and wear rates between 1.79 x 10(-3) and 2.68 x 10(-3) mm(3) (N m)(-1) were measured. With increasing SiC content in the composites, both the friction coefficients and the wear rates were significantly decreased. The friction coefficients reduced to a value between 0.38 and 0.50, and the wear rates to between 2.64 x 10(-4) and 1.93 x 10(-5) mm(3) (N m)(-1) when the SiC content ranged from 10 to 30 vol.%. The enhanced wear resistance of Ti3Si(Al)C-2 is mainly attributed to the facts that the hard SiC particles inhibit the plastic deformation and fracture of the soft matrix, the oxide debris lubricate the counterpair, and the wear mode converts from adhesive wear to abrasive wear during dry sliding. (c) 2006 Elsevier B.V. All rights reserved.