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<p>To break through the bottleneck of crack suppression in laser-fabricated high-hardness coatings, improving the wear resistance, the composite coating with ceramic reinforcement phases was in situ prepared on Ti6Al4V by laser-induced N<sub>2</sub> gas and Ti6Al4V/Cr<sub>3</sub>C<sub>2</sub> powders. The results demonstrated that under a laser power of 1100 W and a scanning speed of 7&#xa0;mm/s, a crack-free coating with a maximum hardness of 1119.72 HV was successfully fabricated. Cr<sub>3</sub>C<sub>2</sub> powders were melted and N<sub>2</sub> was ionized by high-energy laser to in situ synthesize TiC, TiN, and CrN. The 10 wt.% Cr<sub>3</sub>C<sub>2</sub> coating exhibited a bilayer structure with an isometric TiC layer above a granular TiN layer and the best performance in wear resistance with the wear rate of 2.62 × 10<sup>−8</sup> cm<sup>3</sup>/N·m due to the TiC as a better support skeleton for the oxide film. The abrasive wear and oxidation wear were the wear mechanism.</p>

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Effect of Laser-Induced N2 Gas and Ti6Al4V/Cr3C2 Powders Coupling on Properties of Composite Coatings with Ceramic Reinforcement Phases by In Situ Synthesis on Ti6Al4V

  • 期刊论文

  • 发表日期：

    2025年1月27日

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  • Hui-Min Wen,
  • Ming Pang,
  • Yan-Jiao Hu

摘要

To break through the bottleneck of crack suppression in laser-fabricated high-hardness coatings, improving the wear resistance, the composite coating with ceramic reinforcement phases was in situ prepared on Ti6Al4V by laser-induced N2 gas and Ti6Al4V/Cr3C2 powders. The results demonstrated that under a laser power of 1100 W and a scanning speed of 7 mm/s, a crack-free coating with a maximum hardness of 1119.72 HV was successfully fabricated. Cr3C2 powders were melted and N2 was ionized by high-energy laser to in situ synthesize TiC, TiN, and CrN. The 10 wt.% Cr3C2 coating exhibited a bilayer structure with an isometric TiC layer above a granular TiN layer and the best performance in wear resistance with the wear rate of 2.62 × 10−8 cm3/N·m due to the TiC as a better support skeleton for the oxide film. The abrasive wear and oxidation wear were the wear mechanism.