Coating verification and examination task to realize inner diameter thermal spraying by suspension spray method
In recent years, suspension plasma spraying (SPS) which has been actively researched and developed has dense film characteristics with less pores, so it has excellent environmental resistance, corrosion resistance, optical function, electrical function it is used for the intended application.
Furthermore, it is possible to intentionally generate vertical cracks in the coating, to form a feather shape, and it is possible to perform a very effective coating for heat shielding.
These features have not been realized by conventional plasma spraying. Therefore, suspension plasma spraying having these characteristics has attracted attention and expected from various industrial fields.
On the other hand, however, the actual shape of the material to be sprayed in each industrial field is often a three-dimensional shape or an inner diameter portion. Therefore, spraying distance. There are many problems such as thermal spray angle and temperature control.
In this research, in order to realize inner diameter thermal spraying by suspension plasma spraying, we examined how these problems affect and control, and investigated the problems of thermal spraying conditions and observation and verification process of generated coating. We report the findings.