(Ti,W)C Morphology prediction & (Ti,W)C/Ni Interface bonding characteristics analysis based on first principles and experimental verification

Abstract In order to ensure the feasibility of preparing (Ti,W)C composite ceramic reinforced Ni-based coating by laser cladding, the first principle was used to caculate the electronic structure of (Ti,W)C and predict its morphology. The interface bonding properties of (Ti,W)C/Ni were analyzed through interface construction, and the temperature conditions for in situ formation of (Ti,W)C composite ceramics were obtained through thermodynamic analysis. The in situ preparation of (Ti,W)C/Ni composite coatings was conducted through cladding experiment. The microstructure of the coating was detected by SEM, and the crystal morphology and element composition were analyzed to verify the accuracy of (Ti,W)C morphology prediction. The microhardness of the coating was measured by Vickers hardness tester. The results show that (Ti,W)C composite ceramics can be prepared in situ by laser cladding, and its morphology is hexagon-like. The interface of (Ti,W)C and Ni matrix is well combined, and there are no obvious porosity, cracks and other defects. The (Ti,W)C grains in the coating are fine and uniform.