以Ti、Fe、B4C为初始粉末,采用等离子熔覆的方法,在Q235低碳钢表面获得了Fe基TiB2长条、TiC颗粒等多尺度强化相的陶瓷涂层,并分析了涂层的物相组成、组织结构、显微硬度,探讨了物相、组织结构的形成过程.结果表明,涂层主要物相为TiB2、TiC、Fe2B、Fe3(C,B)和α-Fe,其中TiB2主要为长条状,长度为60 ～ 74 μm,少部分呈近六边形块状,尺寸为4～5μm,而TiC主要是不规则的多边形细小颗粒,尺寸2～3 μm,均匀地分散在涂层中,还有部分TiC呈枝晶状;涂层与基体之间存在过渡层,涂层与基体之间结合紧密,呈冶金结合;随着等离子束电流的增加,长条状的TiB2数量减少而近六边形的块状TiB2数量增加,TiC枝晶生长更加充分.因TiB2长条和细小的TiC颗粒共存,对涂层起到多尺度复合强化作用.
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