【摘要】 为了提高Ti6Al4V的生物性能和机械性能，本文采用激光熔凝技术在Ti6Al4V合金表面进行预处理，进而制备微弧氧化（Micro-arc Oxidation）复合涂层，同时研究了激光电流大小对复合涂层性能的影响，并对复合涂层的显微组织和力学性能进行分析，结果发现：涂层主要由锐钛矿型（Anatase）的TiO₂相、金红石型（Rutile）的TiO₂相组成。经过激光熔凝复合MAO后，Ti6Al4V表面涂层孔隙率有所降低，缺陷减少。当电流为70 A时，复合涂层孔隙率达到最低值35.4%,耐蚀性能最优，腐蚀电流密度由3.59×10^-7 A/cm²降低到1.91×10^-7 A/cm²,同时，复合涂层的显微硬度升高至590 HV,润湿角由58.584°降低到30.098°,表明其润湿性得到改善，有利于提高生物相容性。激光熔凝复合微弧氧化处理不仅显著增强了Ti6Al4V合金表面涂层的耐腐蚀性与生物相容性，同时改善了其硬度与表面粗糙度等性能。更多还原

【Abstract】 To enhance the biological and mechanical properties of Ti6Al4V, this study employed laser melting pretreatment to fabricate micro-arc oxidation（MAO） composite coatings on the Ti6Al4V alloy surface, investigating the influence of laser current on coating performance. Microstructural and mechanical analysis of the composite coating revealed that the coating primarily consists of anatase TiO₂ and rutile TiO₂ phases. After laser melting and composite MAO, the porosity of the Ti6Al4V surface coating decreased with reduced defects. At 70 A current, the coating achieved optimal corrosion resistance with a porosity of 35.4%, resulting in a significant reduction in corrosion current density from 3.59×10^-7 A/cm² to 1.91×10^-7 A/cm². Concurrently, the microhardness of composite coatings increased to 590 HV, and the wetting angle decreased from 58.584° to 30.098°, demonstrating improved wetting properties that enhance biocompatibility. The laser melting composite MAO treatment not only significantly boosted the Ti6Al4V alloy’s corrosion resistance and biocompatibility but also enhanced its hardness and surface roughness.更多还原