Frictional Layer and Its Antifriction Effect in High-Purity Ti_3SiC_2 and TiC-Contained Ti_3SiC_2

摘要

Characteristics of the frictional layer in high-purity Ti_3SiC_2 and TiC-contained Ti_3SiC_2, sliding against low carbon steel, were investigated. The friction and wear tests were made using a block-on-disk type friction tester with sliding speed of 20 m/s and several normal pressures from 0.1 MPa to 0.8 MPa. It was found that all friction surfaces, whether high-purity Ti_3SiC_2 or TiC-contained Ti_3SiC_2, were covered by a layer consisting of the oxides of Ti, Si and Fe. The layer was sticky, superimposed layer-by-layer, and the compact was increased with the normal pressure increasing. Because its antifriction effect, the friction coefficient decreases from the maximum 0.35 to 0.27 with increase in the normal pressure from 0.2 MPa to 0.8 MPa for the high-purity Ti_3SiC_2, and decreases from the maximum 0.55 to 0.37 for the same change of the normal pressure for the TiC-contained Ti_3SiC_2. The contained TiC grains had effects on the stickiness, liquidness, as well as the morphology of the layer, and induced the friction coefficient to increase in the entire level.