Abstract The Ti3SiC2–Ti5Si3–TiC composite coatings with various Si content were in-situ prepared by reactive plasma spraying with the mixture of Ti-graphite-Si powders. Results showed that the sprayed coatings consisted of Ti3SiC2, Ti5Si3 and TiC phases. With increasing in Si contents, the content percent of Ti3SiC2 phase increased, and TiC and Ti5Si3 phases decreased. The sizes of the crystallized phases were 50–100 nm.The Ti3SiC2–Ti5Si3–TiC composite coatings had a lamellar structure with good-bonding interfaces. The increased Si contents enhanced the fracture toughness and wear resistance of the Ti3SiC2–Ti5Si3–TiC composite coatings, and failed to enhance their hardness. The wear mechanism of Ti3SiC2–Ti5Si3–TiC composite coatings were abrasive wear, accompanied by adhesive wear and tribo-oxidation wear.

中文翻译：

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反应等离子喷涂Ti3SiC2-Ti5Si3-TiC复合涂层的显微组织演变和力学性能

摘要 采用 Ti-石墨-Si 粉末混合物反应等离子喷涂原位制备了不同 Si 含量的 Ti3SiC2-Ti5Si3-TiC 复合涂层。结果表明，喷涂涂层由 Ti3SiC2、Ti5Si3 和 TiC 相组成。随着Si含量的增加，Ti3SiC2相的含量百分比增加，TiC和Ti5Si3相减少。结晶相的尺寸为 50-100 nm。Ti3SiC2-Ti5Si3-TiC 复合涂层具有层状结构和良好的结合界面。Si含量的增加提高了Ti3SiC2-Ti5Si3-TiC复合涂层的断裂韧性和耐磨性，但未能提高其硬度。Ti3SiC2-Ti5Si3-TiC复合涂层的磨损机制为磨粒磨损，并伴有粘着磨损和摩擦氧化磨损。