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

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 R. C. Garvie, 258 : 703-, 1975

2 M. R. Nadler, 38 : 214-, 1955

3 D. L. Porter, 60 : 183-, 1977

4 Y. M. Kong, 82 : 2963-, 1999

5 T. K. Gupta, 12 : 2421-, 1977

6 H. Schubert, 69 : 270-, 1986

7 P. Duwez, 98 : 356-, 1951

8 M. Turon-Vinasa, 34 : 3865-, 2014

9 J. Vleugels, 22 : 873-, 2002

10 S. P. S. Badwal, 52 : 23-, 1992

11 M. Filal, 80 : 27-, 1995

12 C. J Liao, 20 : 1801-, 1999

13 D. Turnbull, 2 : 419-, 1954

14 R. A. Cutler, 75 : 2173-, 1992

15 M. Dudek, 24 : 253-, 2006

16 정승화, "세리아 안정화 지르코니아의 제조 및 특성(I) : CeO2의 첨가량 변화에 따른 Ce-TZP의 기계적 특성" 한국재료학회 20 (20): 379-384, 2010

17 류재혁, "x mol% 칼시아-안정화 지르코니아 나노분말의 수열합성 및 구조적 특성평가" 한국재료학회 22 (22): 220-226, 2012

18 B. D. Cullity, "Element of X-ray Diffraction" Addison- Wesley Publishing Company. Inc. 269-, 1956