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采用等离子熔—喷技术,在Q235钢表面制作了具有冶金结合的WC-17Co金属陶瓷涂层。采用光学显微镜、SEM、TEM、及EDS等方法,对熔—喷层的组织形貌、相结构及成分进行了分析研究。结果表明,熔—喷涂层组织结构比较复杂,而且有规律地分布在涂层中的不同区域,表层主要由十字花状Fe3W3C初晶、鱼骨状γ-Fe+Fe3W3C共晶、鱼骨状共晶周围的“黑边”和基体组成。中部主要由粗大的树枝状Fe3W3C初晶和枝晶间γ-Fe+Fe3W3C(FeW3C)共晶组成。底部组织比较细密,主要由碳化物WC、Fe3W3C初晶和γ-Fe+Fe3W3C(FeW3C)共晶组成。
A WC-17Co cermet coating with metallurgical bonding was fabricated on the surface of Q235 steel by plasma melt-spray technique. The morphology, phase structure and composition of the melt-sprayed layer were analyzed by optical microscope, SEM, TEM and EDS. The results show that the microstructure of the melt-sprayed coating is complex and regularly distributed in different regions of the coating. The surface of the melt-sprayed coating is mainly composed of cruciform Fe3W3C primary crystals, fishbone γ-Fe + Fe3W3C eutectic, Crystal around the “black side” and the matrix composition. The middle is mainly composed of coarse dendritic Fe3W3C primary and dendrite γ-Fe + Fe3W3C (FeW3C) eutectic composition. The bottom of the organization more closely, mainly by the carbide WC, Fe3W3C primary and γ-Fe + Fe3W3C (FeW3C) eutectic composition.