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Int. J. Mol. Sci. 2012, 13(10), 13569-13586; doi:10.3390/ijms131013569

The Properties of Sintered Calcium Phosphate with [Ca]/[P] = 1.50

1 Yuan Ze Fuel Cell Center, Department of Chemical Engineering and Materials Science, Yuan Ze University, No. 135, Yuan-Tung Road, Chungli, Taoyuan 320, Taiwan 2 Metal Industries Research and Development Centre, 1001 Kaonan Highway, Kaohsiung 81160, Taiwan 3 Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta–Hsueh Road, Tainan 70101, Taiwan 4 Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80782, Taiwan
* Author to whom correspondence should be addressed.
Received: 18 August 2012 / Revised: 10 October 2012 / Accepted: 15 October 2012 / Published: 22 October 2012
(This article belongs to the Section Material Sciences and Nanotechnology)
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In order to obtain the properties of the sintered as-dried calcium phosphate with [Ca]/[P] = 1.50, the characteristics of sintered pellets have been investigated using X-ray diffraction (XRD), inductively coupled plasma-mass spectrometry (ICP-MS), Fourier-transform infrared (FT-IR) spectra, Vickers hardness indentation and scanning electron microscopy (SEM). When the pellet samples were sintered between 700 °C and 1200 °C for 4 h, the hydroxyapatite (Ca10(PO4)6(OH)2, HA) still maintained the major phase, accompanied with the rhenanite (NaCaPO4) as the secondary phase and β-tricalcium phosphate (β-Ca3(PO4)2, β-TCP) as the minor phases. In addition, the HA partially transformed to α-tricalcium phosphate (α-Ca3(PO4)2, α-TCP) and tetracalcium phosphate (Ca4(PO4)2O, TTCP), when the pellet samples were sintered at 1300 °C and 1400 °C, respectively, for 4 h. The maximum density and Vickers Hardness (HV) of sintered pellet samples were 2.85 g/cm3 (90.18% theoretical density (T.D.)) and 407, which appeared at 1200 °C and 900 °C, respectively.
Keywords: sintered; calcium phosphate; hydroxyapatite; density; hardness; microstructure sintered; calcium phosphate; hydroxyapatite; density; hardness; microstructure
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hung, I.-M.; Shih, W.-J.; Hon, M.-H.; Wang, M.-C. The Properties of Sintered Calcium Phosphate with [Ca]/[P] = 1.50. Int. J. Mol. Sci. 2012, 13, 13569-13586.

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