Porous TiO2 ceramic coatings with high contents of Si and P were fabricated on a Ti6Al4V alloy using hybrid processing of laser surface melting (LSM) and microarc oxidation (MAO). The effect of LSM pretreatment on the growth behavior and mechanical properties of the MAO coating was studied. The results showed that the MAO coating on LSM pretreatment Ti6Al4V (LSM-MAO) had quite different surface morphologies, thickness, and compositions compared to the MAO coating on as-received titanium alloy. Grain refinement and dislocation in the LSM-treated Ti6Al4V alloy provided extra energy and more numbers of discharge channels during the MAO process. LSM–MAO coating exhibited a more uniform pore distribution, relatively small pores, and larger thickness compared to the MAO coating. The LSM-MAO coating had higher hardness and better wear resistance than the MAO coating. LSM is deduced to be an appropriate and efficient pretreatment method for achieving a high-quality MAO coating on titanium alloy.Porous TiO2 ceramic coatings with high contents of Si and P were fabricated on a Ti6Al4V alloy using hybrid processing of laser surface melting (LSM) and microarc oxidation (MAO). The effect of LSM pretreatment on the growth behavior and mechanical properties of the MAO coating was studied. The results showed that the MAO coating on LSM pretreatment Ti6Al4V (LSM-MAO) had quite different surface morphologies, thickness, and compositions compared to the MAO coating on as-received titanium alloy. Grain refinement and dislocation in the LSM-treated Ti6Al4V alloy provided extra energy and more numbers of discharge channels during the MAO process. LSM–MAO coating exhibited a more uniform pore distribution, relatively small pores, and larger thickness compared to the MAO coating. The LSM-MAO coating had higher hardness and better wear resistance than the MAO coating. LSM is deduced to be an appropriate and efficient pretreatment method for achieving a high-quality MAO coating on titanium alloy.

中文翻译：

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激光表面熔化预处理对Ti6Al4V合金微弧氧化涂层生长行为及力学性能的影响

使用激光表面熔化 (LSM) 和微弧氧化 (MAO) 的混合工艺在 Ti6Al4V 合金上制备了高 Si 和 P 含量的多孔 TiO2 陶瓷涂层。研究了LSM预处理对MAO涂层生长行为和力学性能的影响。结果表明，与原样钛合金上的 MAO 涂层相比，LSM 预处理 Ti6Al4V (LSM-MAO) 上的 MAO 涂层具有完全不同的表面形貌、厚度和成分。LSM 处理的 Ti6Al4V 合金中的晶粒细化和位错在 MAO 过程中提供了额外的能量和更多数量的放电通道。与 MAO 涂层相比，LSM-MAO 涂层表现出更均匀的孔分布、相对较小的孔和更大的厚度。LSM-MAO涂层比MAO涂层具有更高的硬度和更好的耐磨性。LSM 被推定为在钛合金上实现高质量 MAO 涂层的合适且有效的预处理方法。 采用激光表面熔化 (LSM) 混合工艺在 Ti6Al4V 合金上制备了高 Si 和 P 含量的多孔 TiO2 陶瓷涂层和微弧氧化（MAO）。研究了LSM预处理对MAO涂层生长行为和力学性能的影响。结果表明，与原样钛合金上的 MAO 涂层相比，LSM 预处理 Ti6Al4V (LSM-MAO) 上的 MAO 涂层具有完全不同的表面形貌、厚度和成分。LSM 处理的 Ti6Al4V 合金中的晶粒细化和位错在 MAO 过程中提供了额外的能量和更多数量的放电通道。与 MAO 涂层相比，LSM-MAO 涂层表现出更均匀的孔分布、相对较小的孔和更大的厚度。LSM-MAO涂层比MAO涂层具有更高的硬度和更好的耐磨性。LSM 被认为是在钛合金上实现高质量 MAO 涂层的一种合适且有效的预处理方法。