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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

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.

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