Consolidation of nanocrystalline hydroxyapatite powder

Ramesh, S. and Tan, C.Y. and Sopyan, I. and Abd Shukor, Mohd Hamdi and Teng, W.D. (2007) Consolidation of nanocrystalline hydroxyapatite powder. Science and Technology of Advanced Materials, 8 (1-2). pp. 124-130.

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The effect of sintering temperature on the sinterability of synthesized nanocrystalline hydroxyapatite (HA) was investigated. The starting powder was synthesized via a novel wet chemical route. HA green compacts were prepared and sintered in atmospheric condition at various temperatures ranging from 900-1300 degrees C. The results revealed that the thermal stability of HA phase was not disrupted throughout the sintering regime employed. In general, the results showed that above 98 of theoretical density coupled with hardness of 7.21 GPa, fracture toughness of 1.17 MPa m(1/2) and Young's modulus of above 110 GPa were obtained for HA sintered at temperature as low as 1050 degrees C. Although the Young's modulus increased with increasing bulk density, the hardness and fracture toughness of the sintered material started to decline when the temperature was increased beyond 1000-1050 degrees C despite exhibiting high densities > 98 of theoretical value. The occurrence of this phenomenon is believed to be associated with a thermal-activated grain growth process. (c) 2006 NIMS and Elsevier Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: hydroxyapatite bioceramics sintering mechanical properties grain growth mechanical-properties bioactive materials biomaterials ceramics strength calcium
Subjects: T Technology > TS Manufactures
Divisions: Faculty of Engineering
Depositing User: Mr. Mohammed Salim Abd Rahman
Date Deposited: 09 Jul 2013 07:31
Last Modified: 01 Oct 2021 03:59

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