Abstract
It is facing challenge to prepare protective ceramic coatings on the surfaces of metal parts. In this study, two types of ceramic coatings, ZrB2 and ZrB2 + TiB2, were prepared on 304 stainless steel using high speed laser cladding (HSLC) technology, and a comparative study was conducted on them. The results show that additional TiB2 were melted sufficiently during the HSLC process and reacted with ZrB2 to generate acicular (Zrx, Ti1-x)B2 structure. The existence of (Zrx, Ti1-x)B2 resulted in the increase of hardness from 719 HV0.5 to 1130 HV0.5, and the decrease of wear rate from 8.89 × 10-6 mm3 / N·m to 5.0 × 10-6 mm3 / N·m of the coating. It can be attributed to the large lattice distortion inside (Zrx, Ti1-x)B2, which improved the hardness and wear resistance compared with ZrB2. In addition, the friction coefficient of the coating decreased from 0.73 to 0.68 due to lubricating effect of the oxide debris generated by (Zrx, TI1-x) B2 in the friction process.
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