Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Property of Sintered Y2O3-stabilized Zirconia from Scrap Powders

폐 상안정 지르코니아 분말로 제조한 소결체의 물성 연구

  • Song, Oh-Sung (Department of Materials Science and Engineering, University of Seoul) ;
  • Park, Jong-Sung (Department of Materials Science and Engineering, University of Seoul) ;
  • Nam, Kyung-Ju (Department of Advanced Materials Research and Development, Far East G.N.S. CO., LTD.)
  • 송오성 (서울시립대학교 신소재공학과) ;
  • 박종성 (서울시립대학교 신소재공학과) ;
  • 남경주 ((주)극동지앤에스주식회사 신소재개발부)
  • Published : 2009.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

We newly propose that we may reuse scrap powders ($Z_rO_2$+8 mol%-$Y_2O_3$) as $Y_2O_3$-stabilized zirconia (YSZ) sintered products through sintering process at 1550$^{circ}C$ for 2hrs. We also prepared the reference specimen from fresh $Z_rO_2$+30 mol%-$Y_2O_3$ powder mixture (celluar type with 1㎛-length). The reference sample showed a dense microstructure with grains of $\sim$10㎛ in diameter, while the sintered sample from scrap powder showed irregular grains of 1$\sim$30 ㎛ in diameter. Through XRD analysis, we confirmed that the reference sample has mixed phases of $Y_2O_3$(cubic), $Z_{r0.8}O_{1.9}$(cubic), and $Z_rO_2$(monoclinic), while the sintered YSZ sample from scrap powder has only tetragonal phase. Moreover, the sintered YSZ from scrap powder showed vickers hardness and apparent density more than 70 and 4.11 g/cc, which implies that it can be suitable for structural material application.

스컬 공정으로 제조된 큐빅지르코니아에서 보석용으로 사용되는 부분 외에 일반적으로 버려지는 에지부 폐지르코니아를 분쇄하여 1550$^{circ}C$-2hr의 저온 소결 공정으로 소결한 소결체의 물성을 분석하여 재활용 가능성을 확인해보았다. 비교를 위한 새 지르코니아와 30 mol%-$Y_2O_3$ 혼합분말 (모두 1㎛ 길이의 셀룰러형)로 만든 소결체는 직경 $\sim$10㎛의 조밀 소결체가 결합된 형태를 보였으나, 1$\sim$30㎛의 크기 및 형태가 일정하지 않은 분말로 제조된 폐지르코니아 소결체는 $\sim$30㎛ 이상의 결정립을 가진 미세구조를 보였다. 새 지르코니아 혼합 분말로 만든 소결체는 cubic상인 $Y_2O_3$, $Z_{r0.8}O_{1.9}$와 monoclinic상인 $Z_rO_2$의 혼합상을 보였으나, 폐지르코니아 분말 소결체의 경우 tetragonal 단일상을 보임을 확인하였다. 폐지르코니아 소결체도 70 이상의 비커스 경도와 4.11 g/cc의 소결밀도를 보여서 구조재로 사용이 가능하였다.

Keywords

References

  1. N. Claussen, "FRACTURE TOUGHNESS OF Al//2O//3 WITH AN UNSTABILIZED ZrO//2 DISPERSED PHASE", Journal of the American Ceramic Society, Vol. 59 (1-2), pp. 49-51, 1976. https://doi.org/10.1111/j.1151-2916.1976.tb09386.x
  2. F. F. Lange, "Transformation toughening - Part 4 Fabrication, fracture toughness and strength of Al2O3-ZrO2 composites", Journal of Materials Science, Vol. 17, pp. 247-254, 1982. https://doi.org/10.1007/BF00809060
  3. J. Wang, R. Stevens, "Toughening mechanisms in duplex alumina-zirconia ceramics", Journal of Materials Science, Vol. 23, No. 3, pp. 804-808, 1988. https://doi.org/10.1007/BF01153970
  4. M. Hirano, H. Inada, "Strength and phase stability of yttria-ceria-doped tetragonal zirconia/alumina composites sintered and hot isostatically pressed in argon-oxygen gas atmosphere", Journal of the American Ceramic Society, Vol. 74, pp. 606-611, 1991. https://doi.org/10.1111/j.1151-2916.1991.tb04067.x
  5. C. J. Howard, E. H. Kisi, O. Ohtaka, "Crystal Structures of Two Orthorhombic Zirconias", Journal of the American Ceramic Society, Vol. 74, No. 9, pp. 2321-2323, 1991. https://doi.org/10.1111/j.1151-2916.1991.tb08307.x
  6. Levin E. M., Robbins, C. R. and Mc Murdie, H. F., "Phase Diagrams for Ceramists", ed. M. K. Reser, American Ceramic Society, Colombus, OH, Fig. 5251 pp. 141, 1964.
  7. V. I. Aleksandrov, V. V. Osiko, A. M. Prokhrov, V. M. Tatarinntsev, "Synthesis and Crystal Growth of Refractory Materials by RF Melting in a Cold Container", North-Holland Publishing Co., Amsterdam, Netherlands, pp. 421-480, 1978.
  8. A. Baermann, W. Guse, H. Saalfeld, "Characterization of different (Me,Zr)O2 single crystals grown by the "skull-melting" technique", Journal of Crystal Growth, Vol. 79(1-3), pp. 331-335, 1986. https://doi.org/10.1016/0022-0248(86)90458-6
  9. D. B. Zhang, X. M. He, J. P. Chen, J. C. Wang, Y. F. Tang, B. L. Hu, "Research on crystal growth and defects in cubic zirconia", Vol. 79(1-3), pp. 336-340, 1986. https://doi.org/10.1016/0022-0248(86)90459-8
  10. R. C. Buchanan, S. Pope, "OPTICAL AND ELECTRICAL PROPERTIES OF YTTRIA STABILIZED ZIRCONIA(YSZ) CRYSTALS". Journal of the Electrochemical Society, Vol. 130, No. 4, pp. 962-966, 1983. https://doi.org/10.1149/1.2119868
  11. K. R. Han, S. J. Park, K. S. Hong, H. W. Jun, "Preparation of Sintered ATZ by Sol-Gel Process and Properties", J. Kor. Soc. Anal. Sci., Vol. 6, No. 2, pp. 225-229, 1993.
  12. V. I. Aleksandrov, V. V. Osiko, A. M. Prokhrov, V. M. Tatarinntsev, "Synthesis and Crystal Growth of Refractory Materials by RF Melting in a Cold Container", North-Holland Publishing Co., Amsterdam, Netherlands, pp. 421-480, 1978.
  13. Y. K. Paek, J. H. Ahn, "Sintering Atmosphere Effect on the Grain Size and Phase Distribution of a Zirconia", Journal of the Korean Ceramic Society, Vol. 36, pp. 1198-1204, 1999.
  14. R. Aragon, "Skull melter single crystal growth of magnetite (Fe3O4)-ulvospinel (Fe2TiO4) solid solution members", Journal of Crystal Growth, Vol. 61, No. 2, pp. 221-228, 1983. https://doi.org/10.1016/0022-0248(83)90358-5
  15. D. Michel, M. Perez, Y. Jorba, R. Collongues, "Growth from skull-melting of zirconia-rare earth oxide crystals", Journal of Crystal Growth, Vol. 43, No. 4, pp. 546-548, 1978. https://doi.org/10.1016/0022-0248(78)90359-7