Properties of the System $ZrO_2$+3m/o $Y_2O_3$ Powder Prepared by Co-Precipitation Method(II) Effects of $Al_2O3$$Cr_2O_3$Addition on Mechanical Properties and Microstructures of Y-TZP

공침법으로 제조한 $ZrO_2$+3m/o $Y_2O_3$계 분체의 특성(II) : Y-TZP의 기계적 성질 및 미세구조에 미치는 $Al_2O3$$Cr_2O_3$의 첨가영향

  • 이홍림 (연세대학교 요업공학과) ;
  • 최동근 (연세대학교 요업공학과) ;
  • 홍기곤 (연세대학교 요업공학과) ;
  • 신현곤 (금성전기 주식회사)
  • Published : 1990.04.01

Abstract

The effects of Al2O3 and Cr2O3 addition on the mechanical properties and microstructures of Y-TZP ceramics obtained by co-precipitation method of ZrO2+3m/o Y2O3, following pressureless sintering at 150$0^{\circ}C$ for 2h were investigated. The addition of Al2O3 and Cr2O3 improved the Y-TZP sinterability and the Al2O3 addition showed the better effect on Y-TZP sintering than that of the Cr2O3 addition. The density and microstructure had the better effect on the bending strength of specimen more than stressinduced phase transformation (SIPT) of ZrO2 from tetragonal to monoclinic phase. The hardness of the specimens was found to be depend on the relative density and the fracture toughness of Y-TZP was found to rely on the amount of SIPT. The grian size of Cr2O3-doped Y-TZP was observed to be relatively smaller and had a narrower distribution than that of Al2O3-doped Y-TZP. If decomposition reaction of Cr2O3 can be controlled at high temperatures, it is anticipated that the mechanical properties of Y-TZP can be much improved by the Cr2O3 addition.

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References

  1. 窯業協會昭和56年年會講演豫稿集 正木 樹;小林啓佑
  2. Trans. J. Br. Ceram. Soc. v.82 Sintering Addititves for Zirconia Suxing Wu;R.J. Brook
  3. J. Am. Ceram. Soc. v.67 Crystalline Phase Change in Yttria-Partially-Stabilized Zirconia by Low-Temperature Annealing T. Sato;H. Shimada
  4. Trans, AIME v.180 Some Factors Affecting the Rate of Grain Growth in Metals〔70 ; 30 Brsaa〕 C. Zener(et al.)
  5. J. Am. Ceram. Soc. v.60 no.3;4 Mechanisms of Toughening Partially Stabillized Zirconia Ceramics(PSZ) D.L. Porter;A.H. Heuer
  6. Cer. Sci. Eng. Proc. Lee;Brun
  7. 第21回 窯業基礎討論會講演要旨集 v.59 新原皓ㅡ
  8. J. Am.Ceram. Soc. v.55 no.6 Phase Analysis in Zirconia System R.C. Garvie;P.S. Nicholson
  9. Extended Abstracts Zirconia 86 N. Kimura;H. Okamura;J. Morishta
  10. フアセラミシワス東典 フアセラミシワス事典編集委員會
  11. Nature v.258 no.5537 Ceramic Steel? R.C. Garvie;R H Hannink;R.T. Pascoe
  12. 月館降明 東洋曹達硏究新告 津久間孝次;고견광생
  13. 窯業協會誌 v.86 no.1 Effects of Oxygen Partial Pressure on Vaporization Rates in the System MgO-Cr₂O₃ H.L. Lee;T. Sata
  14. J. Am. Ceram. Soc. v.60 no.5;6 Reply to Further Discussion of Precipitation in Partially Stabilized Zirconia D.L. Porter;A.H. Heuer