((北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京 100083))
摘 要: 采用前驅(qū)體碳化復(fù)合技術(shù)制備Ti-Fe-Ni-C系粉末，并通過反應(yīng)等離子噴涂技術(shù)(RPS)原位合成并沉積了TiC /Fe-Ni基金屬陶瓷復(fù)合涂層。利用XRD、SEM和EDS研究復(fù)合粉末和涂層的成分、組織結(jié)構(gòu)，考察復(fù)合粉末的TiC含量及復(fù)合粉末粒度對涂層組織結(jié)構(gòu)的影響。結(jié)果表明：采用前驅(qū)體碳化復(fù)合技術(shù)制備的反應(yīng)噴涂復(fù)合粉末粒度均勻、無有害相生成；TiC/Fe-Ni復(fù)合涂層由不同含量TiC顆粒分布于晶粒內(nèi)部而形成的晶內(nèi)型復(fù)合強化片層疊加而成，基體主要為(Fe、Ni)固溶體，TiC顆粒呈納米級；涂層TiC含量較高時，納米級TiC顆粒彌散分布更均勻；噴涂粉末粒度較大時，片層厚度較大，孔隙率較高。
關(guān)鍵字: TiC /Fe-Ni；反應(yīng)等離子噴涂；前驅(qū)體；金屬陶瓷復(fù)合涂層
（(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
