Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fabrication and Characterization of Zirconia Thermal Barrier Coatings by Spray Drying and Atmospheric Plasma Spraying

분무건조 및 대기 플라즈마 용사에 의한 지르코니아 열차폐 코팅재의 제조 및 평가

  • Kim, Chul (School of Mechanical Systems Engineering, Kookmin University) ;
  • Heo, Yong Suk (School of Mechanical Systems Engineering, Kookmin University) ;
  • Kim, Tae Woo (School of Mechanical Systems Engineering, Kookmin University) ;
  • Lee, Kee Sung (School of Mechanical Systems Engineering, Kookmin University)
  • 김철 (국민대학교 기계시스템공학부 기계설계전공) ;
  • 허용석 (국민대학교 기계시스템공학부 기계설계전공) ;
  • 김태우 (국민대학교 기계시스템공학부 기계설계전공) ;
  • 이기성 (국민대학교 기계시스템공학부 기계설계전공)
  • Received : 2013.07.22
  • Accepted : 2013.08.19
  • Published : 2013.09.30
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Abstract

In this study, we prepared yttria stabilized zirconia granules for thermal barrier coatings using a spray drying process. First, we characterized the properties of granules such as flow rate and packing density for utilizing the air plasma spray process. The flow rate and packing density data showed 0.732 g/sec and 2.14 $g/cm^3$, respectively, when we used larger and denser particles, which are better than hollow granules or smaller spherical granules. Second, we chose larger, spherical granules fabricated in alcohol solvent as starting powders and sprayed it on the bondcoat/nimonic alloy by an atmospheric plasma spray process varying the process parameters, the feeding rate, gun speed and spray distance. Finally, we evaluated representative thermal and mechanical characteristics. The thermal expansion coefficients of the coatings were $11{\sim}12.7{\times}10^{-6}/^{\circ}C$ and the indentation stress measured was 2.5 GPa at 0.15 of indentation strain.

Keywords

References

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