Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/96586
Title: Fabricating densified hydroxyapatite ceramics from a precipitated precursor
Authors: Yeong, K.C.B.
Wang, J. 
Ng, S.C. 
Keywords: Bioceramic fabrication
Density
Fracture toughness
Grain growth
Hydroxyapatite
Issue Date: Feb-1999
Source: Yeong, K.C.B.,Wang, J.,Ng, S.C. (1999-02). Fabricating densified hydroxyapatite ceramics from a precipitated precursor. Materials Letters 38 (3) : 208-213. ScholarBank@NUS Repository.
Abstract: A fine hydroxyapatite precursor was prepared by reacting calcium hydroxide and an orthophosphoric acid solution. To fabricate sintered hydroxyapatite ceramic, the resulting precursor was not calcined in powder form. Instead, it was compacted in a uniaxial die, followed by thermal treatment of the powder pellets at various temperatures, prior to being sintered at a high temperature. A sintered density of 98.15% theoretical was obtained at a sintering temperature as low as 1000°C. Prolonged dwelling at 1200°C, up to more than 20 h, did not affect the phases present in the sintered hydroxyapatite, although it resulted in a slight fall in sintered density due to the grain coarsening. The increase in average grain size leads to a noticeable improvement in fracture toughness of the sintered hydroxyapatite.
Source Title: Materials Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/96586
ISSN: 0167577X
Appears in Collections:Staff Publications

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