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采用X 射线、扫描电镜、透射电镜及选区电子衍射等手段研究了镍包碳化钨金属陶瓷亚音速火焰喷涂层的微观组织结构.试验结果表明,由于喷涂温度较高,使镍包碳化钨颗粒处于熔融或半熔融状态,发生了碳化钨的分解,在凝固过程中除了形成六方结构的WC外,还形成了少量的密排六方结构的α- W2C.在NI 熔体和WC熔体的互熔区形成了一定数量的具有复杂面心结构的M6C和具有正交结构的NI3C,以及少量的M6C+ γ- NI 基固溶体共晶.“,”The microstructure of subsonic speed flame spraying WC/Ni metal-ceramic coating has been studied by means of X-ray,scanning electron microscopy,transmitting electron microscopy and selected area electronic diffraction techniques etc.The results show that the WC is decomposed since the WC/Ni particle is melting or half-melting at the higher spraying temperature,besides the WC of hexagonal structure,a small amount of α-W 2C which has close-packed hexagonal structure is formed during solidifying;a certain amount of M 6C and Ni 3C as well as a small amount of M 6C+γ-Ni based solid solution eutectic is formed at inter-melting zone of Ni and WC,M 6C has complex face central cubic structure while Ni 3C has orthogonal structure.