Hypersonic flame spraying (HVOF) is a spraying technique that utilizes the high-speed ejection of a gas mixture to form a supersonic airflow, which melts the sprayed material and accelerates the spraying onto the surface of the coated material. Its working principle is to use the high-temperature and high-speed airflow generated by the combustion of gas mixtures to heat and accelerate the spraying of sprayed materials, forming a hard and dense coating. It can complete large-scale painting work in an extremely short time, with high spraying efficiency and the ability to form high-quality coatings. Supersonic spraying can use various types of materials for spraying, including metals, ceramics, composite materials, etc., making it widely applicable. In addition, supersonic spraying can form very dense coatings with good corrosion resistance and wear resistance.