A Study on Vacuum Plasma Spraying Tungsten Coatings
The W coatings were prepared by applying the vacuum plasma spraying process (VPS). The phase composition, microstructure and laser irradiation property were characterized by XRD, SEM and laser. Results showed that no tungsten oxide appears in the coatings whose phase composition is similar to the original powder. A better melting state of the coating can be obtained by using the finer powder. The deposition efficiency of the coating is higher in the cases of a higher H2 flow. There is a pitch whose size is about 100μm when the substrate was irradiated by laser. However, there is clearly no change for the W coating surface which was also irradiated under the same condition. It indicates that the laser irradiation resistance is improved significantly for stainless steel after being deposited with W coating.
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
Z. Yi et al., "A Study on Vacuum Plasma Spraying Tungsten Coatings", Materials Science Forum, Vols. 544-545, pp. 849-852, 2007