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Variations of structure and composition in magnesium incorporated hydroxyapatite/β-tricalcium phosphate

Published online by Cambridge University Press:  01 February 2006

Hyun-Seung Ryu ,
Kug Sun Hong ,
Jung-Kun Lee  and
Deug Joong Kim
Hyun-Seung Ryu
Affiliation:
R&D Center, Bioalpha Inc., Seongnam, Kyonggi 462-807, Korea
Kug Sun Hong*
Affiliation:
School of Materials Science & Engineering, Seoul National University, Seoul 151-742, Korea
Jung-Kun Lee
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Deug Joong Kim
Affiliation:
Department of Materials Engineering, Sungkyunkwan University, Suwon 440-746, Korea
*
a)Address all correspondence to this author. e-mail: kshongss@plaza.snu.ac.kr
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Abstract

The phase evolution of magnesium incorporated hydroxyapatite/β-tricalcium phosphate (HA/β-TCP) ceramics of high purity prepared by solid-state reaction was investigated with the aid of x-ray diffraction and infrared spectroscopy (IR) in transmittance mode analysis. The dependence of the microstructure on the phase evolution of biphasic ceramics during natural sintering was also investigated as a function of Mg content. When sintered at 1100 °C, Mg is preferentially incorporated into the β-TCP phase rather than the HA phase. This Mg incorporation into the β-TCP effectively suppresses the phase transition from β- to α-TCP. With increasing sintering temperature, the solubility limit of the Mg in the β-TCP decreases and Mg starts to be either incorporated into the HA phase or segregated as free MgO. The decreased Mg content in the β-TCP facilitates the phase transition from β- into α-TCP, at 1300 °C or higher. Different processing methods on Mg addition show that the retarded phase transition from β- to α-TCP is the inherent property of Mg-doped HA/TCP. The variations in processing parameters mainly affect the microstructure instead of the phase evolution, leading to highly densified HA/β-TCP ceramics.

Keywords

CeramicPhase transformationSintering

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Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 2 , February 2006 , pp. 428 - 436
Copyright
Copyright © Materials Research Society 2006

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