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Enhancement of Surface Hardness of Zirconia Ceramics by Hydroxyapatite Powder Bed Sintering

Hydroxyapatite 분위기 소결을 통한 지르코니아 표면 경도 강화

  • Choi, Min-Geun (Department of Materials Science and Engineering, Inha University) ;
  • Lim, Ji-Ho (Department of Materials Science and Engineering, Inha University) ;
  • Kong, Kyu-Hwan (Department of Materials Science and Engineering, Inha University) ;
  • Jeong, Dae-Yong (Department of Materials Science and Engineering, Inha University) ;
  • Lee, Wonjoo (Research Center for Green Fine Chemicals, KRICT) ;
  • Li, Long-Hao (School of Materials Science and Engineering, University of Ulsan) ;
  • Kong, Young-Min (School of Materials Science and Engineering, University of Ulsan)
  • 최민근 (인하대학교 신소재공학과) ;
  • 임지호 (인하대학교 신소재공학과) ;
  • 공규환 (인하대학교 신소재공학과) ;
  • 정대용 (인하대학교 신소재공학과) ;
  • 이원주 (한국화학연구원 그린정밀화학연구센터) ;
  • 이용호 (울산대학교 첨단소재공학부) ;
  • 공영민 (울산대학교 첨단소재공학부)
  • Received : 2014.10.28
  • Accepted : 2014.11.18
  • Published : 2014.12.27

Abstract

To increase the mechanical property of zirconia, we have investigated the phase change and the resulting hardness of zirconia ceramics by hydroxyapatite (HA) powder bed sintering. It was observed using X-ray diffraction that the cubic zirconia phase, which has a higher hardness value than that of the tetragonal phase, was obtained at the surface of 3 mol% $Y_2O_3$ doped tetragonal zirconia polycrystal (3Y-TZP) ceramics during the sintering process; in our experimental conditions, the phase change at the surface increased as the sintering time increased. We believe that the observed crystalline phase change originated from the decomposition of HA and the diffusion of CaO, as follows. CaO, which was derived from the decomposition of HA at high temperature ($1400^{\circ}C$), diffused into the surface of 3Y-TZP and acted as a stabilizer. As a result, the Vickers hardness value of the treated specimens was higher than that of the non-treated specimen due to the formation of the cubic phase on the surface of 3Y-TZP.

Keywords

References

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