서스펜션 플라즈마 용사로 제조된 란타눔/가돌리늄 지르코네이트 열차폐코팅의 구조와 열전도도 특성

Kwon, Chang-Sup;Lee, Sung-Min;Oh, Yoon-Suk;Kim, Hyung-Tae;Jang, Byung-Koog;Kim, Seongwon

  • 투고 : 2014.12.03
  • 심사 : 2014.12.24
  • 발행 : 2014.12.31


With increase in demand for higher operating temperatures of gas turbines, extensive research efforts have been carried out to enhance the performance of thermal barrier coatings (TBCs) in the field of coating processing as well as materials. In this study, thermal barrier coatings in lanthanum/gadolinium zirconate system, which is one of the most promising candidates for replacing yttira-stabilized zirconia (YSZ) in thermal barrier coating applications, are fabricated via suspension plasma spray. Dense, $300{\sim}400{\mu}m$ thick coatings of fluoritephase zirconate with modest amount of segmented microstructures are obtained by using suspension plasma spray with suspensions of planetary-milled mixture between lanthanum and/or gadolinium oxide and nano zirconia. These coatings exhibit thermal conductivities of 1.6 ~ 1.7 W/mK at $1000^{\circ}C$, which is relatively lower than that of YSZ.


Thermal barrier coatings;Suspension plasma spray;Rare-earth zirconate;Phase formation;Thermal conductivity


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피인용 문헌

  1. Characteristics of Bulk and Coating in Gd2−xZr2+xO7+0.5x(x = 0.0, 0.5, 1.0) System for Thermal Barrier Coatings vol.53, pp.6, 2016,
  2. Phase Formation and Thermal Diffusivity of Thermal Barrier Coatings of La2Zr2O7, (La0.5Gd0.5)2Zr2O7, Gd2Zr2O7Fabricated by Suspension Plasma Spray vol.49, pp.6, 2016,
  3. Fabrication and Characterization of La2Zr2O7/YSZ Double-Ceramic-Layer Thermal Barrier Coatings Fabricated by Suspension Plasma Spray vol.48, pp.6, 2015,
  4. Fabrication and Characteristics of Thermal Barrier Coatings in the La2O3-Gd2O3-ZrO2System by Using Suspension Plasma Spray with Different Suspension Preparations vol.49, pp.6, 2016,


연구 과제 주관 기관 : 산업통상자원부, 한국세라믹기술원