Microstructures of TiC/Fe-Ni metal ceramic composite coatings by reactive plasma spray

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.