In the industrial field, coating powder material is a kind of surface engineering application material. It is coated on the surface of the substrate to resist wear, corrosion, high temperature, oxidation and aging, and meet special effects or functions such as light, electricity and magnetism. As the manufacturing of some products becomes more and more sophisticated and the service conditions become more and more demanding, higher requirements are also put forward for surface coating materials. People have found that when the characteristic scale of the material is reduced to the nanoscale, the properties of the material in the macroscopic world will be obviously different from those in the macroscopic world due to small size effect, quantum effect, interface or surface effect. This also prompted scientists to think that nanotechnology and surface engineering should be integrated.


Surface engineering is a special field. It is an industry that combines materials and processes. If there are only materials, but the coating process is not good or uneconomical, it cannot be carried out. Thermal spraying is a relatively mature technology. It is the most popular and has the highest cost-effectiveness. How to use thermal spraying technology to spray nanomaterials was once a difficult problem for people to consider. Because nanoparticles are tiny particles, if they are operated by thermal spraying, the nanoparticles will be ablated or blown away in an instant, and the material cannot reach the substrate, let alone form an effective functional coating. The solution is to aggregate the nanoparticles to form micron-sized particles, which can have the special effects of nanomaterials and can also be used for thermal spraying.