What is supersonic flame spraying

       Supersonic flame spraying (or high-speed flame spraying) is a new type of high-energy flame spraying method that appeared in the 1980s. Its development is the most creative development in the thermal spraying industry after plasma spraying. Because it uses oxygen to support combustion, it is usually called HVOF (High velocity oxygen fuel). In the mid-1990s, Browning Company of the United States developed a new type of supersonic flame spraying system - air supersonic flame spraying system, also known as HVAF system. It uses compressed air instead of oxygen, and liquid fuel (such as kerosene) instead of gas fuel, which improves the safety of spraying and reduces costs on the premise of ensuring the quality of the coating.



      Supersonic flame spraying is to use the high temperature flame flow generated by the combustion and expansion of gas or liquid fuel in the combustion chamber or in a special nozzle, so that it is sprayed along the nozzle, and the flame flow speed can reach more than 1500m/s, and the powder is fed axially. The flame can heat the sprayed particles to a molten or semi-melted state, and accelerate to a speed of 300m/s~600m/s or even higher, so as to obtain a high-quality coating with high bonding strength and density.

       The supersonic flame spraying method has less oxygen in the flame, moderate temperature and high flame velocity, which can effectively prevent the oxidation and decomposition of powder coating materials, so it is especially suitable for the spraying of carbide coatings. The equipment has been developed to the third generation, and its performance has been greatly improved. For example, the thickness of the coating prepared by JP-5000, DJ-2700 and other equipment can reach several millimeters, and the coating performance has reached the level of explosive spraying. Widely used in many industrial sectors. Such as wear-resistant coatings in aviation engines, mirror coatings for paper machinery, etc. In recent years, due to the environmental pollution of the chrome electroplating process, the chrome electroplating industry has been strictly restricted in some industrialized countries and gradually eliminated. attach great importance to.