대기 플라즈마 용사법으로 제조된 Mo 및 Mo 혼합 코팅층의 미세조직과 마모특성 = Microstructure and Wear Properties of Molybdenum and Molybdenum Blend Coatings Fabricated by Atmospheric Plasma Spraying

다국어 초록 (Multilingual Abstract)

The objective of this study is to investigate the correlation between the microstructure and wear resistance of various molybdenum blend coatings applicable to automotive parts. Five types of molybdenum spray powders, one of which was pure molybdenum powders and the others were blend powders of molybdenum powders mixed with brass, bronze, and aluminum alloy powders, were sprayed on a low-carbon steel substrate by atmospheric plasma spraying. Microstructural analysis of the coatings showed that they consisted of curved lamellar structures formed by elongated splats, while hard precipitates formed during spraying were relatively homogeneously distributed in the molybdenum matrix. The wear test results revealed that the blend coatings showed the better wear resistance than the pure molybdenum coating because they contained a number of hard precipitates. In particular, the molybdenum coating blended with bronze and aluminum alloy powders showed the excellent wear resistance, together with the excellent wear resistance of a counterpart material, resulting from the presence of hard precipitates and their homogeneous wear. Therefore, in order to improve the overall wear properties with consideration of the wear resistance of a counterpart material, appropriate spray powders should be blended with molybdenum powders to form hard precipitates in the coatings of this study.