Abstract:

A TiC/Al3Ti composite coating on the gray cast iron was fabricated by the reaction
synthesis in melt.The microstructure,interface,micro-hardness and wear resistance were investigated.
The results show that the composite is formed on gray cast iron compactly with a metallurgical bonding interface.TiC presented a strip form as the content of TiC is 20%;with increase of TiC,its shape changes from the strip form to a granular form with decreased size.The hardness of the coating are substantially higher than that of the iron matrix and slightly increases with increasing TiC content.It is found that the composite coatings are more effective in improving wear resistance,greatly enhanced the
surface hardness and the wearing resistance of the gray cast iron.

Key words: composite coating, TiC/Al3Ti, microstructure, wear resistance

摘要：

采用铸造反应合成技术在灰铸铁表面原位合成TiC/Al3Ti复合涂层材料,对复合涂层的显微组织、硬度和耐磨性进行了研究。结果表明:Al-Ti-C体系完全反应后可制备出纯净的TiC/Al3Ti表面复合涂层材料,该表面复合材料组织致密,并随着涂层中TiC含量的增加,材料的硬度有所提高,表面复合涂层的硬度明显高于铁基体的硬度,磨损性能也要优于铁基体,明显改善了铸铁的表面硬度和摩擦性能。
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关键词: 复合涂层, TiC/Al3Ti, 组织结构, 耐磨性能