Tribological properties and microstructures of Al₂O₃-TiC-TiB₂ reinforced composites

摘要

Ti-3Al-2V alloy is an important aviation material but shows poor resistance to slid wear. Laser cladding of the Fe_(3)Al-B_(4)C pre-placed powders on a Ti-3Al-2V substrate can form the TiC-TiB_(2) reinforced composites, which improved the wear resistance of the substrate. In this study, it was noted that the addition of the Al_(2)O_(3) and 7 wt.% yttria partially stabilized zirconia (YPSZ) was able to further increase the wear resistance of such composites. Al_(2)O_(3) increased the dilution rate of the substrate to the laser molten pool to a certain extent; moreover, Al_(2)O_(3) improved the hardness, elastic modulus and the mechanical properties of such laser clad composites. The YPSZ addition led t-ZrO_(2)-ZrSiO_(4) to be produced in such composites.