Plasma spraying is a surface modification technology that uses a high-temperature plasma jet of several thousand to tens of thousands of degrees Celsius to instantly melt and accelerate powdered spray materials, forming a dense coating on the substrate surface. It enables the formation of coatings from high-melting-point materials such as ceramics, cemented carbides, and intermetallic compounds, and can impart various functionalities like wear resistance, corrosion resistance, heat resistance, and electrical insulation, all while minimizing thermal impact on the substrate. It is an indispensable processing method for extending the lifespan and enhancing the performance of parts used in harsh environments, such as turbine blades in aircraft engines, semiconductor manufacturing equipment components, and rolls in steel plants.