((北京科技大学 材料科学与工程学院，北京 100083))
摘 要: 采用前驱体碳化复合技术制备Ti-Fe-Ni-C系粉末，并通过反应等离子喷涂技术(RPS)原位合成并沉积了TiC /Fe-Ni基金属陶瓷复合涂层。利用XRD、SEM和EDS研究复合粉末和涂层的成分、组织结构，考察复合粉末的TiC含量及复合粉末粒度对涂层组织结构的影响。结果表明：采用前驱体碳化复合技术制备的反应喷涂复合粉末粒度均匀、无有害相生成；TiC/Fe-Ni复合涂层由不同含量TiC颗粒分布于晶粒内部而形成的晶内型复合强化片层叠加而成，基体主要为(Fe、Ni)固溶体，TiC颗粒呈纳米级；涂层TiC含量较高时，纳米级TiC颗粒弥散分布更均匀；喷涂粉末粒度较大时，片层厚度较大，孔隙率较高。
关键字: TiC /Fe-Ni；反应等离子喷涂；前驱体；金属陶瓷复合涂层
（(School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)）
Abstract:A kind of Ti-Fe-Ni-C system composite powders for reactive spraying was prepared by precursor carbonization process. TiC/Fe-Ni metal ceramic composite coatings were synthesized and deposited by reactive plasma spray (RPS) of the composite powders. XRD, SEM and EDS were employed to analyze the compositions and microstructures of these composite powders and coatings. The influence of particle size of spraying powders, different contents of TiC of composite coatings on microstructure and composition of the composite coatings were investigated. The results show that the TiC/Fe-Ni composite coatings prepared by RFS are composed of layers in which the nanoscale TiC particles are dispersed within Fe-Ni solid solution alloy matrix. The higher the content of TiC of coatings is, the better the distribution of the nanoscale TiC particles dispersed within Fe-Ni matrix is. The larger the particle size of powders is，the thicker the layers are and the higher the porosity of coatings is.
Key words: TiC/Fe-Ni; reactive plasma spray; precursor; metal ceramic composite coating
