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通过LWY400P激光器,用激光熔覆的方法在镁合金表面熔覆一层Ti-C-Al复合陶瓷涂层。原料中钛碳原子比为1∶1,铝含量10%~40%(质量分数)。分别用扫描电镜和能谱分析仪对熔覆层的微观组织、显微形貌和成分分布进行了测定和分析。结果表明,激光熔覆Ti-C-Al复合涂层是典型的快速凝固组织,涂层组织致密,晶粒细小。原料中Al含量对熔覆效果影响很大,Al含量越高,试样致密度越好,通过试验确定了原料中Al的最佳用量。融合区域各元素相互扩散,涂层与基体发生互熔,形成冶金结合,达到强化目的。
Through LWY400P laser cladding, a layer of Ti-C-Al composite ceramic coating was laser cladded on the surface of magnesium alloy. Titanium carbon atoms in the raw material ratio of 1: 1, aluminum content of 10% to 40% (mass fraction). The microstructure, microstructure and composition distribution of the coating were measured and analyzed by SEM and EDS respectively. The results show that the laser cladding Ti-C-Al composite coating is a typical rapid solidification structure, the coating is dense, fine grain. The Al content in the raw material has a great influence on the cladding effect. The higher the Al content is, the better the density of the sample is. The optimum amount of Al in the raw material is determined through experiments. Each element in the fusion area interpends with each other, and the coating and the substrate are mutually melted to form a metallurgical combination so as to achieve the purpose of strengthening.