Research progress on deposition mechanism of ceramic metallization by cold spraying

The difference in thermal expansion coefficient between ceramics and metals results in poor bonding strength after heat processing. Cold spraying (CS) is a new and green surface coating and additive manufacturing technology with the advantages as high bonding strength, little thermal impact on substrates, and residual compressive stress. The cold spraying is recognized as a potential ceramic metallization method because it can be employed to fabricate the metallic coatings on the ceramics directly with the relatively high bonding strength. The research progress and technical status of the cold spray ceramic metallization technology at home and abroad were reviewed in this article, the microstructure characteristics and process optimization were analyzed, the bonding phenomena and mechanisms of coatings were discussed, and the application potential and challenge of the cold spray ceramic metallization technology were summarized.