以TiC-TiB2复合材料为电极,采用电火花表面强化技术,在40Cr钢表面制备出TiC-TiB2复合强化层.利用SEM和XRD分析了强化层的微观结构和物相,测试了强化层的硬度和耐磨性,并探讨了其磨损机理.结果表明:强化层物相主要为TiB2、TiC和Fe3C等,非晶组织和组织细化使其衍射峰宽化;强化层的显微硬度分布呈梯度变化,最高硬度值是基体硬度值的4倍多;强化层中的硬质相和较高的显微硬度改变了试样间的磨损机制,强化层的磨损机制为显微切削、划擦和疲劳磨损;强化层的耐磨性比基体提高了约5倍,摩擦系数比基体低0.12～0.17.
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