Wear and oxidation resistant properties of TiC/FeNiCr composite coating produced by centrifugal-thermite process at high temperature

TiC/FeNiCr cermet composite coating has been prepared in a carbon steel pipe by centrifugal-thermite process. The microstructure of coating has been investigated using X-ray diffraction (XRD) and scanning electron microscope (SEM) attached with EDX. The wear and oxidation resistant properties of coating at 1000 degrees C are measured and compared with CrNiMo steel. Results show that the TiC/FeNiCr composite is composed of alpha-FeNiCr, gamma-FeNiCr, TiC and NiAl. The microstructure of coating is thin and compact, having no large dendritical crystals, microcracks and micropores. The coating has good oxidation resistant property, the mass gain of TiC/FeNiCr layer oxidized at 1000 degrees C for 24 h is lower than 1 mg/cm(2), decreases for 120 times compared with the CrNiMo steel. Also the coating has good high-temperature wear resistant property, the volume wear rate of TiC/FeNiCr is nearly the seventh of the volume wear rater of steel.