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Enhancement of Surface Hardness of Zirconia Ceramics by Hydroxyapatite Powder Bed Sintering
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Hydroxyapatite 분위기 소결을 통한 지르코니아 표면 경도 강화

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Type
Academic journal
Author
Choi, Min-Geun (인하대학교 신소재공학과) Lim, Ji-Ho (인하대학교 신소재공학과) Kong, Kyu-Hwan (인하대학교 신소재공학과) Jeong, Dae-Yong (인하대학교 신소재공학과) Lee, Wonjoo (한국화학연구원 그린정밀화학연구센터) Li, Long-Hao (울산대학교 첨단소재공학부) Kong, Young-Min (울산대학교 첨단소재공학부)
Journal
Materials Research Society Of Korea 한국재료학회지 한국재료학회지 제24권 제12호 KCI Accredited Journals SCOPUS
Published
2014.1
Pages
677 - 681 (5page)

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Enhancement of Surface Hardness of Zirconia Ceramics by Hydroxyapatite Powder Bed Sintering
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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.
#$ZrO_2$ #CaO #hydroxyapatite #decomposition #diffusion

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References (18)

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R. C. Garvie / 1975 / Nature 258:703 google schola T. K. Gupta / 1977 / J. Mater. Sci 12:2421 google schola D. L. Porter / 1977 / J. Am. Ceram. Soc 60:183 google schola Y. M. Kong / 1999 / J. Am. Ceram. Soc. 82:2963 google schola 정승화 / 2010 / 세리아 안정화 지르코니아의 제조 및 특성(I) : CeO2의 첨가량 변화에 따른 Ce-TZP의 기계적 특성 / 한국재료학회지 20(7):379~384 dbpia

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