Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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In-Situ Fabrication of TCP/Al2O3 and Fluorapatite/Al2O3 Composites by Normal Sintering of Hydroxyapatite and Al2O3 Powder Mixtures

Hydroxyapatite와 Al2O3 혼합분말의 상압소결에 의한 TCP/Al2O3 및 Fluorapatite/Al2O3 복합재료의 In-Situ 제조

  • Ha, Jung-Soo (School of Materials Science and Engineering, Andong National University) ;
  • Han, Yoo-Jeong (School of Materials Science and Engineering, Andong National University)
  • 하정수 (안동대학교 신소재공학부) ;
  • 한유정 (안동대학교 신소재공학부)
  • Received : 2018.12.17
  • Accepted : 2019.02.11
  • Published : 2019.02.27
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Abstract

A powder mixture of 70 wt% $Al_2O_3$ and 30 wt% hydroxyapatite (HA) is sintered at $1300^{\circ}C$ or $1350^{\circ}C$ for 2 h at normal pressure. An $MgF_2$-added composition to make HA into fluorapatite (FA) is also prepared for comparison. The samples without $MgF_2$ show ${\alpha}$ & ${\beta}$-tricalcium phosphates (TCPs) and $Al_2O_3$ phases with no HA at either of the sintering temperatures. In the case of $1,350^{\circ}C$, a $CaAl_4O_7$ phase is also found. Densification values are 69 and 78 %, and strengths are 156 and 104 MPa for 1,300 and $1,350^{\circ}C$, respectively. Because the decomposition of HA produces a $H_2O$ vapor, fewer large pores of $5-6{\mu}m$ form at $1,300^{\circ}C$. The $MgF_2$-added samples show FA and $Al_2O_3$ phases with no TCP. Densification values are 79 and 87 %, and strengths are 104 and 143 MPa for 1,300 and $1,350^{\circ}C$, respectively. No large pores are observed, and the grain size of FA ($1-2{\mu}m$) is bigger than that of TCP ($0.7{\mu}m{\geq}$) in the samples without $MgF_2$. The resulting $TCP/Al_2O_3$ and $FA/Al_2O_3$ composites fabricated in situ exhibit strengths 6-10 times higher than monolithic TCP and HA.

Keywords

References

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