한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제42권1호
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  • Pages.43-49
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  • 2005
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
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알루미나에 YSZ가 나노코팅된 층상형 시스템의 인덴테이션 특성평가

Indentation of YSZ/Al2O3 Layered Systems Prepared by Nano-Coating

  • 김상겸 (국민대학교 기계자동차공학부 기계설계전공) ;
  • 김태우 (국민대학교 기계자동차공학부 기계설계전공) ;
  • 김철 (국민대학교 기계자동차공학부 기계설계전공) ;
  • 신태호 (한국에너지 기술연구원 에너지재료연구센터) ;
  • 한인섭 (한국에너지 기술연구원 에너지재료연구센터) ;
  • 우상국 (한국에너지 기술연구원 에너지재료연구센터) ;
  • 이기성 (국민대학교 기계자동차공학부 기계설계전공)
  • Kim, Sang-Kyum (School of Mechanical and Automotive Engineering, Kookmin University) ;
  • Kim, Tae-Woo (School of Mechanical and Automotive Engineering, Kookmin University) ;
  • Kim, Chul (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Shin, Tae-Ho (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Han, In-Sub (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Woo, Sang-Kuk (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Lee, Kee-Sung (School of Mechanical and Automotive Engineering, Kookmin University)
  • 발행 : 2005.01.01
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초록

전자 범 물리적 증착법(Electron Beam Physical Vaper Deposition, EB-PVD)으로 알루미나 상용기판 위에 나노 크기의 YSZ입자를 포함하고 있는 층을 코팅하여 층상형 시스템을 제조하였으며, 이때 기판층의 온도를 600, 700, $800^{circ}C$로 변화시켜 증착되는 YSZ층이 서로 다른 미세구조가 형성되도록 제어하여, 코팅층 미세구조의 변화에 따른 인덴데이션 거동을 고찰하였다 인덴테이션 거동으로는 비커스 인덴테이션과 헤르찌안 인덴테이션으로 피라미드형 압자 혹은 초경 구를 압입하였으며 압입 하중 및 코링층 구조에 따른 경도와 인덴테이션 응력-변형률 곡선을 구하였고, 미세구조와 하중의 증가에 따른 손상 및 파괴거동을 고찰하였다. 기판층의 온도가 향상됨에 따라 증착된 입자의 크기가 보다 증가하고 각진 입자가 형성됨을 알 수 있었고, 서로 다른 미세구조가 인덴테이션 거동에 영향을 주어, $800^{circ}C$에서 증착된 YSZ/A12달 구조가 상대적으로 우수한 특성을 나타내었다.

YSZ layer containing nano-sized particles has been deposited on the commercial A1203 substrate by Electron Beam Physical Vapor Deposition (EB-PVD). The role of coating rnjcrostructures of YSZ to indentation damage is studied. The different coating microsouctures are prepared by varying the substrate temperatures from $600^{circ}C$ to $800^{circ}C$ during the deposition. Microhardness test and Hertzian indentation are conducted on the $YSZ/Al_{2}O_{3}$ layered systems. The damage and flilure behaviors have been investigated according to the effect of microstructures and indentation loads. With increasing the substrate temperature during EB-PVD, the overall grain sizes are coarser and more faceted, which microsoucture ultimately influences on the indentation behavior, thus, YSZ/Al_{2}O_{3}$ layered system prepared at the substrate temperature of $800^{circ}C$ shows relatively higher damage tolerance.

키워드

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