Self-reaction in-situ synthesis of TiC/FeNiCr composite coating in centrifugal field

A TiC-FeNiCr composite materials coating on the substrate of a low carbon steel was successfully prepared using centrifugal-thermit process with raw materials Fe₂O₃, CrO₃, NiO, Al, Ti and C powder. The microstructure of the coating was investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The microhardness and wear-ability of the coating were measured. The results shows that the coating is composed of austenite phase and the reinforced phase TiC. The coating is metallurgical bonded to the carbon steel substrate. The TiC grain takes the shape of a polygon or petal and its size is larger than that of the austenite phase. The microhardness of the composite coating is about Hv 500 - Hv 800, and it has good wear resistance under dry sliding wear test condition.