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采用铸造反应合成技术在钢铁表面合成TiC/Al3Ti金属间化合物基复合材料涂层。研究了涂层的物相、组织和界面形貌,测试了涂层的硬度分布并对涂层的形成机理进行探讨。结果表明:在熔融铁液作用下,Al-Ti-C体系反应完全,制备出TiC颗粒增强金属间化合物基表面复合涂层。TiC颗粒均匀地镶嵌在Al3Ti基体上,涂层致密。当TiC含量较少时,TiC呈条状;随着TiC含量的增加,TiC尺寸逐渐减小,且由长条状向粒状转化。涂层与铁基体界面为良好的冶金结合,从涂层到界面处Al、Ti、Fe、C元素呈梯度变化。涂层的硬度明显高于基体,且随着涂层中TiC含量的增加略有提高。
Synthesis of TiC / Al3Ti Intermetallic Composite Coatings on Steel Surface by Casting Reaction Synthesis Technology. The phase, microstructure and interfacial morphology of the coating were studied. The hardness distribution of the coating was tested and the formation mechanism of the coating was discussed. The results show that the reaction of Al-Ti-C system is completed under the action of molten iron liquid, and the TiC particle reinforced intermetallic compound-based composite coating is prepared. TiC particles are uniformly embedded in Al3Ti matrix, the coating is dense. When the content of TiC is small, the TiC is strip-like. With the increase of TiC content, the size of TiC decreases gradually and changes from long strip to granular. The interface between the coating and the iron substrate is a good metallurgical bond, and the elements Al, Ti, Fe and C change gradient from the coating to the interface. The hardness of the coating was significantly higher than that of the matrix, and slightly increased with the TiC content in the coating.