Cold spray is a materials deposition process in which small metallic particles, or blends of metallic and non-metallic particles, are accelerated using a high pressure gas stream above a critical threshold velocity out of a de Laval type rocket nozzle. and bind to a surface of a suitable substrate upon impact. The temperature of the particles are significantly below the melting point of the impinging particles, giving rise to the ‘cold’ in cold spray.
Westinghouse is developing cold spray technology for a wide variety of applications that benefit from cold spray’s ability to apply continuous high hardness corrosion resistant material deposits. These include protection from stress corrosion cracking, repair and mitigation of erosion and corrosion damage in carbon steel piping, and dimensional restoration of components.
Key results of Westinghouse’s research in cold spray will be presented, with applications focused on repair and mitigation of degradation in nuclear power plant equipment.