TiC/ Fe-Ni composite coating prepared by reactive plasma spraying and its erosion wear performance

Ferrotitanium powder，nickel powder and sucrose (carbonaceous precursor) were used as raw materials. A kind of Ti-Fe-Ni-C composite powder for reactive thermal spraying was fabricated by heating a mixture of ferrotitanium，nickel and sucrose to carbonize the sucrose. TiC/Fe-Ni composite coatings were prepared by plasma spraying of the Ti-Fe-Ni-C composite powder . It shows that the composite coatings are mainly composed of layers in which the TiC particles are uniformly dist ributed within (Fe，Ni) solid solution alloy matrix，and the TiC particles in these layers are spherical or near-spherical of submicron-scale or nano-scale sizes. Although erosion wear characters of brittle materials are represented in the erosion wear performance test of the TiC/Fe-Ni composite coatings，the ratio of mass loss of erosion wear is slightly affected by the jet angles，which demonst rates that the composite coatings have good cooperation of plasticity and hardness. The erosion wear performance of the TiC/Fe-Ni composite coating is higher than that of C_r2C₃/Ni-Cr composite coating，and is more than two times that of 20G steel .