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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.2 pp.129-135
DOI : https://doi.org/10.3740/MRSK.2019.29.2.129

In-Situ Fabrication of TCP/Al2O3 and Fluorapatite/Al2O3 Composites by Normal Sintering of Hydroxyapatite and Al2O3 Powder Mixtures

Jung-Soo Ha,Yoo-Jeong Han
School of Materials Science and Engineering, Andong National University, Andong 36729, Republic of Korea
Corresponding author E-Mail : jsha@anu.ac.kr (J.-S. Ha, ANU)

Abstract

A powder mixture of 70 wt% Al2O3 and 30 wt% hydroxyapatite (HA) is sintered at 1300 oC or 1350 oC for 2 h at normal pressure. An MgF2-added composition to make HA into fluorapatite (FA) is also prepared for comparison. The samples without MgF2 show α & β-tricalcium phosphates (TCPs) and Al2O3 phases with no HA at either of the sintering temperatures. In the case of 1,350 oC, a CaAl4O7 phase is also found. Densification values are 69 and 78 %, and strengths are 156 and 104MPa for 1,300 and 1,350 oC, respectively. Because the decomposition of HA produces a H2O vapor, fewer large pores of 5-6 μm form at 1,300 oC. The MgF2-added samples show FA and Al2O3 phases with no TCP. Densification values are 79 and 87%, and strengths are 104 and 143 MPa for 1,300 and 1,350 oC, respectively. No large pores are observed, and the grain size of FA (1-2 μm) is bigger than that of TCP (0.7 μm ≥) in the samples without MgF2. The resulting TCP/Al2O3 and FA/Al2O3 composites fabricated in situ exhibit strengths 6-10 times higher than monolithic TCP and HA.

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

하정수,한유정
안동대학교 신소재공학부

초록

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