Thermal Spray Coating의 耐磨耗 特性 向上에 관한 硏究 = A Study of Abrasive Resistance Improvement Methodology on the Thermal Spray Coating

다국어 초록 (Multilingual Abstract)

Thermal spray coating process has proven to be effective at producing hard, dense, wear resistance coatings on the relatively mild substrates. The thermal spray coating technique is now widely used to improve various surface characteristics such as corrosion/oxidation resistance, wear resistance and electrical/thermal insulation properties using cermet, intermetallics or ceramics. Among several spraying techniques, HVOF(High Velocity Oxygen Fuel) and plasma coating process are preferentially used particularly for wear resistance application such as capstan. The effects of pre-treatment, in-process and post-treatment parameters on the structures and wear properties of several coating processes of WC + 12% Co, Cr₃C₂and Al₂O₃powder coatings on medium carbon steel substrates have been studied. Several process conditions were investigated and compared in order to optimize the process conditions on microstructure, phase structure, microhardness, adhesive strength and abrasive wear resistance of the coatings, especially in capstan application. The result indicates that carbide coating is more preferable to the oxide coatings and the post-treatments consisting of vacuum annealing and sealing on the carbide coatings lead to significant improvements in wear resistance, adhesive strength and phase stabilization over the other processing techniques in this application.