Studies on Phase Transition and Microstructure Evolution of WC-CoCr during High-Temperature Transient Thermal Spraying

Abstract

Laser is characterized as fast hating and quick cold, the laser real-time heating method was used to simulate phase transition and microstructure evolution during high temperature transient thermal spraying process in this paper, and thermodynamics calculation conformed the main phases during thermal spraying process. The wettability and chemical reaction between main phases were studied by the sessile method. Main phases and microstructure of the coatings were analyzed by XRD and SEM. By clarifying the coupling mechanism of diffusion mass transition and chemical reaction between inter-phases, the optimal spraying process parameters and excellent mechanical properties of WC-CoCr coating were determined. An important theoretical basis for the preparation technology of high properties and long lifer coating was provided.