利用预涂NiC-Si复合粉末对TiAl合金进行激光熔覆处理,分析了涂层的显微组织及其形成机理,并讨论了显微组织与预涂合金粉末成分的关系.结果表明:涂层的显微组织由初生块状Ti5Si3相及点状γ-NiCrAl/TiSi共晶组织组成,随着预涂合金粉末中Si含量的增加,涂层中初生Ti5Si3块状相的体积分数增大,显微硬度提高,涂层与基体之间为良好的冶金结合.
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