Y-TZP에서 표면 처리에 따른 저온열화 거동의 직접적 관찰
Direct Observation on the Low Temperature Degradation Due to Surface Treatment in Y-TZP
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Low temperature degradation behavior in yttria stabilized tetragonal zirconia polycrystal (Y-TZP)ceramics was microscopically observed from the phase contrast between monoclinic surface and tetragonal matrix. The degradation behavior was dependent on the surface treatment of sintered Y-TZP, even if the sintering history is same. In the mirror polished specimen, the monoclinic layer appeared in a uniform thickness from the surface. On the contrary, for the specimen with coarse scratch, the thickness of degraded surface was more than double especially from the coarse scratch. Since the scratch results in local deformation, the residual stress should be induced around the scratch. With the transformation from tetragonal to monoclinic, the volume expansion exerts a stress on a neighboring grains and promotes a successive phase transformation. Such a autocatalytic effect can be triggered from the part of coarse scratch.
Abstract
Low temperature degradation behavior in yttria stabilized tetragonal zirconia polycrystal (Y-TZP)ceramics was microscopically observed from the phase contrast between monoclinic surface and tetragonal matrix. The degradation behavior was dependent on the surface treatment of sintered Y-TZP, even if the sintering history is same. In the mirror polished specimen, the monoclinic layer appeared in a uniform thickness from the surface. On the contrary, for the specimen with coarse scratch, the thickness of degraded surface was more than double especially from the coarse scratch. Since the scratch results in local deformation, the residual stress should be induced around the scratch. With the transformation from tetragonal to monoclinic, the volume expansion exerts a stress on a neighboring grains and promotes a successive phase transformation. Such a autocatalytic effect can be triggered from the part of coarse scratch.
참고문헌 (21)
- W. R. Cannon, , Treatise on Materials Science and Technology, 29, pp.195~ (1989)
- S. H. Chu, , J. Solid State Chem, 23, pp.297~ (1978)
- A. P. Santos, , J. Euro.Ceram. Soc, 18, pp.1571~ (1998)
- N. Claussen, "Science and Technology of Zirconia II", American Ceramic Society, 12, pp.325~ (1984)
- I. Nettleship, , Int. J. High Technology Ceramics, 3, pp.1~ (1987)
- S. Lio, "Science and Technology of Zirconia III", American Ceramic Society, 24, pp.49~ (1988)
- T. Sato, , J. Am. Ceram. Soc, 68, pp.356~ (1985)
- T. Sato, , J. Mater. Sci, 20, pp.3988~ (1985)
- T. Arai, "Science and Technology of Zirconia III", American Ceramic Society, 24, pp.517~ (1988)
- T. Sato, , J. Am. Ceram. Soc, 67, pp.212~ (1984)
- P. J. Whalen, , J. Am.Ceram. Soc, 72, pp.319~ (1989)
- H. Schubert, , Proc. Br.Ceram. Soc, 34, pp.157~ (1984)
- N. Claussen, , J. Am. Ceram. Soc, 61, pp.369~ (1978)
- T.-J. Chung, , J.Am. Ceram. Soc, 80, pp.2607~ (1997)
- T.-J. Chung, , J. Am.Ceram. Soc, 82, pp.3193~ (1999)
- T.-J. Chung, , J. Am. Ceram. Soc, 84, pp.172~ (2001)
- 정태주, "입자크기와 열처리 분위기 변화에 따른 Y-TZP에서의 상안정성 변화", 한국분말야금학회지, 13(5), pp.360~365 (2006), 한국분말야금학회
- J.-H. Han, , Acta Metall. Mater, 43, pp.3185~ (1995)
- R. C. Garvie, , J. Am. Ceram, 55, pp.303~ (1972)
- H. Toraya, , J. Am.Ceram. Soc, 67, pp.119~ (1984)
- M. Rühle, "Science and Technology of Zirconia II", American Ceramic Society, 12, pp.352~ (1984)