Study on heat-resistance of TiC/FeNiCr composite coating produced by centrifugal-thermite process

The TiC/FeNiCr coating was prepared by centrifugal-thermite process in a carbon steel pipe. The microstructure stability of the coating at elevated temperature was investigated by means of XRD, DSC and SEM. The ablation-resistance property of the coating was measured by plasma ablation test. Results show that the TiC/FeNiCr composite was composed of α-FeNiCr, TiC, NiAl and Ni₃Al. The structure of the coating was thin and compact, having no large dendritical crystals, microcracks and micropore. In the heating process below 1300°C, phase transformation had not been found. After the heating process, the grain size of the TiC nearly didn't grow, the hardness of the material got slightly lower. The line ablation rate of the TiC /FeNiCr layer was 4.53 μm/ s, raised 32% compared with the 0.45C% steel.