Supersonic spraying has better comprehensive performance

       

The supersonic plasma spray coating has better comprehensive performance. Among them, the use of moire interferometry to measure the residual stress of the coating has high feasibility and broad development prospects. Appropriate heat treatment is the method for the comprehensive performance of the coating. Scanning electron microscope (SEM), X-ray diffractometer (XRD) and indenter were used to study the microstructure and mechanical properties of the coatings.

A proper heat treatment process can reduce the porosity of the coating. Improve the elastic modulus and hardness of the coating. Release the residual tensile stress of the coating. But the heat treatment temperature is higher than 600 ℃ or the holding time is longer than 2 hours, which will reduce the quality of the coating.