通过在氮气中加入铝粉，采用激光气体氮化技术在Ti-6Al-4V钛合金表面原位制备了TiN/Ti₃Al复合涂层，研究了涂层的微观形貌、物相组成、硬度分布以及抗含SiC和SiO₂颗粒的高温高速水蒸气冲蚀的能力。结果表明：涂层的表面硬度为（1 400±50）HV，是Ti-6Al-4V钛合金的4倍；用SiC颗粒冲蚀较短时间或用SiO₂颗粒冲蚀后，涂层的冲蚀质量损失随冲蚀角度的增大而增加，Ti-6Al-4V钛合金的则减小；在相同冲蚀角度下，涂层的冲蚀质量损失随冲蚀颗粒硬度的增加而增大，Ti-6Al-4V合金的冲蚀质量损失在较小冲蚀角度时也遵循此规律，但在较大冲蚀角度下，质量损失的变化不大。

TiN/Ti₃Al composite coating was in-situ synthesized on the surface of Ti-6Al-4V alloy by laser gas nitriding technique with the aluminium powder mixed in the nitrogen. The micromorphology, phase composition, hardness distribution and the anti-erosion performance with high-temperature high-velocity steam containing SiC and SiO₂ particles of the coating were studied. The results show that the surface hardness of the coating was (1 400±50) HV, four times higher than that of Ti-6Al-4V titanium alloy. After erosion with SiC particles during a relatively short period or with SiO₂ particles, the erosion mass loss of the coating increased with the increase of erosion angle, while that of the Ti-6Al-4V titanium alloy decreased. At the same erosion angle, the erosion mass loss of the coating increased with the increase of erosion particle hardness, and that of the Ti-6Al-4V titanium alloy followed this rule at relatively small erosion angles while changed little at relatively large erosion angles.