Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

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

알루미나에 YSZ가 나노코팅된 층상형 시스템의 인덴테이션 특성평가

  • 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)
  • 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)
  • Published : 2005.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

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.

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.

Keywords

References

  1. S. C. Tjong and H. Chen, 'Nanocrystalline Materials and Coatings,' Mater. Sci. and Eng., R45 1-88 (2004)
  2. B. A. Movchan, 'Functionally Graded EB PVD Coating,' Surf. Coat. Tech., 149 252-62 (2002) https://doi.org/10.1016/S0257-8972(01)01439-6
  3. W. Beele, G. Marinjinissen, and A. van Lieshout, 'The Evolution of Thermal Barrier Coatings - Status and Upcoming Solutions for Today's Key Issues,' Surf. Coat. Tech., 120-121 61-7 (1999) https://doi.org/10.1016/S0257-8972(99)00342-4
  4. Y. H. Sohn, J. H. Kim, E. H. Jordan, and M. Gell, 'Thermal Cycling of EB-PVD/MCrAIY Thermal Barrier Coatings: I. Microstructural Development and Spallation Mechanisms,' Surf. Coat. Tech., 146-147 70-8 (2001)
  5. H. Xu, H Guo, F. Liu, and S. Gong, 'Development of Gradient Thermal Barrier Coatings and their Hot-Fatigue Behavior,' Surf. Coat. Tech., 130 133-39 (2000) https://doi.org/10.1016/S0257-8972(00)00695-2
  6. R. G. Wellman and J. R. Nicholls, 'Some Observations on Erosion Mechanisms of EB PVD TBCS,' Wear, 242 89-96 (2000) https://doi.org/10.1016/S0043-1648(00)00391-4
  7. W. Choi, Y. D. Kim, H. Jeon, H. Kim, K. Yoon, K. Hong, J. K. Park, and W. Park, 'Oxidation Behavior at the Interface Between E-Beam Coated $ZrO_2-7$ wt%$Y_2O_3$ and Plasma Sprayed CoNiCrAIY,' Kor. J. of Mater. Res., 8 [6] 538-44 (1998)
  8. B. R. Lawn, Fracture of Brittle Solids, Cambridge Univ. Press, Cambridge, Ed. 2 (1993)
  9. D. B. Marshall and B. R. Lawn, 'Indentation of Brittle Materials,' Microindentation Techniques in Materials Science and Engineering, ASTM STP 889, P. J. Blau and B. R. Lawns Eds., American Society for Testing and Materials, Philadelphia, pp. 26-46 (1986)
  10. K. S. Lee, S. K. Lee, and D. K. Kim, 'A Study on the Coating Fracture in Silicon Nitride Bilayer : I. Effect of Elastic/Plastic Mismatch,' J. Kor. Ceram. Soc., 34 [12] 1268-74 (1997)
  11. K. S. Lee, S. K. Lee, and D. K. Kim, 'A Study on the Coating Fracture in Silicon Nitride Bilayer: II. Effect of Coating Thickness,' J. Kor. Ceram. Soc., 35 [1] 48-54 (1997)
  12. B. R. Lawn, 'Indentation of Ceramic with Spheres : A Century After Hertz,' J. Am. Ceram. Soc., 81 [8] 1977-94 (1998) https://doi.org/10.1111/j.1151-2916.1998.tb02580.x
  13. K. S. Lee, J. Y. Park, W. J. Kim, and G. W. Hong, 'Effect of Microstructure SiC Layer on the Indentation Properties of Silicon Carbide-Graphite System Fabricated by LPCVD Method,' J. Mater. Sci. Lett., 20 1229-31 (2001) https://doi.org/10.1023/A:1010979007886
  14. O. Vingsbo, S. Hogmark, B. Jonsson, and A. Ingemarsson, 'Indentation of Hardness of Surface-Coated Materials,' Microindentation Techniques in Materials Science and Engineering, ASTM STP 889, P. J. Blau and B. R. Lawns Eds., American Society for Testing and Materials, Philadelphia, pp. 257-271 (1986)
  15. J. H. Kim, S. Lee, K. S. Lee, and D. K. Kim, 'The Effect of Grain Boundary Phase on Contact Damage Resistance of Alumina Ceramics,' J. Mater. Sci., 39 7023-30 (2004) https://doi.org/10.1023/B:JMSC.0000047547.09325.3d
  16. C. S. Lee, K. S. Lee, S. Lee, and D. K. Kim, 'Effect of Grain Boundary Phase on Contact Damage Resistance of Silicon Nitride Ceramics,' Key Eng. Mater., 287 421-26 (2005) https://doi.org/10.4028/www.scientific.net/KEM.287.421
  17. A. Pajares, L. Wei, and B. R. Lawn, 'Damage Accumulation and Cyclic Fatigue in Mg-PSZ at Hertzian Contacts,' J. Mater. Res., 10 [10] 2613-25 (1995) https://doi.org/10.1557/JMR.1995.2613
  18. S. Wuttiphan, A. Pajares, B. R. Lawn, and C. C. Berndt, 'Effect of Substrate and Bond Coat on Contact Damage in Zirconia-Based Plasma-Sprayed Coatings,' Thin Solid Films, 293 251-60 (1997) https://doi.org/10.1016/S0040-6090(96)08992-4
  19. B. A. Latella, T. Liu, and A. J. Atanacio, 'Effect of Grain Size on Hertzian Contact Damage in 9 mol% Ce-TZP Ceramics,' J. Eur. Ceram. Soc., 22 1971-79 (2002) https://doi.org/10.1016/S0955-2219(01)00527-1