以Cr3C2和Fe-CrNiBSi粉末为原料,采用等离子熔覆工艺在Q235基板上原位制备了柱状碳化物(Cr,Fe)7C3增强Fe基涂层.用光学显微镜、扫描电镜、电子能谱、X射线衍射仪、同步热分析仪及热力学计算,观察分析了初生碳化物(Cr,Fe)7C3在涂层中的生长特征,并考察了该碳化物增强涂层在不同载荷下的干滑动摩擦磨损性能.结果表明:涂层中初生碳化物(Cr,Fe)7C3为六棱长柱状,以外加Cr3C2颗粒为异质形核基底向外发散生长.热力学分析结果表明,Cr3C2颗粒可促进初生碳化物(Cr,Fe)7C3的形成;在碳化物(Cr,Fe)7C3柱体的内部有孔洞,性质较脆,外部有大量裂纹,裂纹源多发生在柱体与柱体的相交处;碳化物(Cr,Fe)7C3增强涂层的耐磨性显著高于无(Cr,Fe)7C3增强的纯Fe-CrNiBSi合金涂层,但由于碳化物(Cr,Fe)7C3柱体的脆性大,断裂韧性较低,在高载荷下其磨损表面出现大量垂直于滑动方向的裂纹.
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