플라즈마 용사 및 전자빔 물리기상 증착법으로 제조된 4YSZ 코팅의고온마찰마모 거동
High Temperature Tribology Behavior of 4YSZ Coatings Fabricated by Air Plasma Spray (APS) and Electron Beam Physical Vapor Deposition (EB-PVD)
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초록
4 mol% Yttria-stabilized zirconia (4YSZ) coatings are fabricated by Air Plasma Spray (APS) and ElectronBeam Physical Vapor Deposition (EB-PVD) with top coating of thermal barrier coating (TBC). NiCrAlYbased bond coat is prepared as 150 μm thickness by conventional APS (Air Plasma Spray) method on theNiCrCoAl alloy substrate before deposition of top coating. Each 4YSZ top coating shows different tribologicalbehaviors based on the inherent layer structures. 4YSZ by APS which has splat-stacked structure shows lowerfriction coefficient but higher wear rate than 4YSZ by EB-PVD which has columnar structure. For 4YSZby APS, such results are expected due to the sliding wear accompanied with local delamination of splats.
Abstract
4 mol% Yttria-stabilized zirconia (4YSZ) coatings are fabricated by Air Plasma Spray (APS) and Electron Beam Physical Vapor Deposition (EB-PVD) with top coating of thermal barrier coating (TBC). NiCrAlY based bond coat is prepared as 150 μm thickness by conventional APS (Air Plasma Spray) method on the NiCrCoAl alloy substrate before deposition of top coating. Each 4YSZ top coating shows different tribological behaviors based on the inherent layer structures. 4YSZ by APS which has splat-stacked structure shows lower friction coefficient but higher wear rate than 4YSZ by EB-PVD which has columnar structure. For 4YSZ by APS, such results are expected due to the sliding wear accompanied with local delamination of splats
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