The Characteristics of Wear Resistance of Cu-TiB2 Composites Reinforced by TiB2 Powders

In this study, the effect of the content of TiB2 on wear properties was investigated. Cu-TiB2 composites have been fabricated by hot extrusion. Sliding wear tests were performed by a pin-on-disk type wear test machine under dry condition and loads varied with from 20N to 80N at sliding speed 3.5Hz. The test results showed that the wear losses and the friction coefficients decreased with increasing TiB2 volume fraction and increasing the size of TiB2 particle. Wear property of 10 mu m, 5 vol% TiB2 specimen was excellent all of the wear specimens. It is thought that the increase of plastic flow resistivity due to uniform distribution of 10 mu m, 5 vol% TiB2 wear specimen would improve wear property. The worn surface and wear debris were examined by optical microscope and scanning electron microscope.