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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.24 No.12 pp.677-681

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

Min-Geun Choi1, Ji-Ho Lim1, Kyu-Hwan Kong1, Dae-Yong Jeong1, Wonjoo Lee2, Long-Hao Li3, Young-Min Kong3†
1Department of Materials Science and Engineering, Inha University, Incheon 402-751, Korea
2Research Center for Green Fine Chemicals, KRICT, Ulsan 681-802, Korea
3School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Korea
Corresponding author
E-Mail : (Y.-M. Kong, Univ. of Ulsan)
2014년 10월 28일 2014년 11월 18일 2014년 11월 18일


To increase the mechanical property of zirconia, we have investigated the phase change and the resulting hardnessof zirconia ceramics by hydroxyapatite (HA) powder bed sintering. It was observed using X-ray diffraction that the cubiczirconia phase, which has a higher hardness value than that of the tetragonal phase, was obtained at the surface of 3mol%Y2O3 doped tetragonal zirconia polycrystal (3Y-TZP) ceramics during the sintering process; in our experimental conditions, thephase change at the surface increased as the sintering time increased. We believe that the observed crystalline phase changeoriginated from the decomposition of HA and the diffusion of CaO, as follows. CaO, which was derived from thedecomposition of HA at high temperature (1400oC), 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 ofthe cubic phase on the surface of 3Y-TZP.

Hydroxyapatite 분위기 소결을 통한 지르코니아 표면 경도 강화

최민근1, 임지호1, 공규환1, 정대용1, 이원주2, 이용호3, 공영민3†
1인하대학교 신소재공학과
2한국화학연구원 그린정밀화학연구센터
3울산대학교 첨단소재공학부