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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 3.0).

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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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