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 has been a difficult problem for people. 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 agglomerate the nanoparticles to form micron-sized particles. In this way, both the special effects of nanomaterials and the thermal spraying process can be implemented.