Effect of Y2O3 on the sliding wear resistance of TiB/TiC-reinforced composite coatings fabricated by laser cladding
作者： J. Li , X. Luo , G.J. Li
DOI: 10.1016/J.WEAR.2013.12.019
关键词:
摘要: Abstract TiB/TiC-reinforced titanium matrix composite coatings were prepared by laser cladding on Ti6Al4V substrates. The effects of the addition Y2O3 microstructure, microhardness, fracture toughness, and dry sliding wear resistance investigated. Microstructural observation showed that mainly consisted TiC TiB particles uniformly dispersed in coarse cellular dendrites interdendritic eutectic structure. refined structure primary phase, improved microstructural uniformity, increased volume fraction TiC. average microhardness was from HV 725.30 to 812.98, toughness 8.32 MPa m1/2 17.36 MPa m1/2. coating with had excellent micro-cutting cracking. Analyses initial worn surfaces covered a thin tribolayer, which Fe its oxides. true smoother than without due protection tribolayer. cross-sections tracks revealed surface many fine cracks caused debonding fragments coating. mechanism defined as oxidative wear. Measurement results mass loss friction coefficient values further verified positive effect improvement resistance.
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