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APS법으로 제조된 열장벽 피막과 PAS법으로 제조된 열장벽 성형체의 고온 물성에 관한 연구
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  • APS법으로 제조된 열장벽 피막과 PAS법으로 제조된 열장벽 성형체의 고온 물성에 관한 연구
저자명
강현욱,권현옥,한주철,송요승,홍상희,허성강,김선화
간행물명
한국표면공학회지
권/호정보
1999년|32권 2호|pp.144-156 (13 pages)
발행정보
한국표면공학회
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

Thermal Barrier Coating with Functional Gradient Materials (FGM-TBC) can play an important role to protect the parts from harmful environments in high temperatures such as oxidation, corrosion, and wear and to improve the efficiency of aircraft engine by lowering the surface temperature on turbine blade. FGM-TBC can increase the life spans of product and improve the operating properties. Therfore, in this study the evaluations of mechanical and thermal properties of FGM-TBC such as fatigue, oxidation and wear-resistance at high temperatures have been conducted. The samples of both the TBC with 2, 3, 5 layers (YSZ/NiCrAlY) to be produced by Air Plasma Spray method (APS) and the bulk TBC with 6 layers to be produced by Plasma Assisted Sintering method (PAS) were used. Furthermore, residual stress, bond strength, and thermal conductivity were evaluated. The average thickness of the APS was 500$mu extrm{m}$ to 600$mu extrm{m}$ and the average thickness of the PAS was 3mm. The hardness number of the top layer of APS was 750 Hv to 810Hv and that of PAS was 950 Hv to 1440Hv. The $ZrO_2$ coating layer of APS was composed of tetragonal structure after spraying as the result of XRD analysis. As shown in the results of the high temperature wear test, the 3 layer coating of APS had the best wear resistance at $800^{circ}C$ and the 5 layer coating of APS had the best wear resistance at $600^{circ}C$. But, these coatings had the tendency of the low-temperature softening at $300^{circ}C$. The main mechanism of wear was the adhesive wear and the friction coefficient of coatings was increased as increasing the test temperatures. A s results of thermal conductivity test, the ${Delta}T$ of the APS coating was increased as number of layer and the range of thermal conductivity of the PAS was $800^{circ}C$ to $1000^{circ}C$.