期刊
ACTA BIOMATERIALIA
卷 5, 期 2, 页码 735-742出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2008.09.005
关键词
Calcium phosphate; Sol-gel processing; Amorphous powders; Sintering; Ceramics
Amorphous calcium phosphate powders were precipitated from calcium metal and phosphoric acid in ethanol. Depending on the quantity of reagent, the CaP powders had different chemical compositions and, after heating, formed beta-tricalcium phosphate (PTCP), hydroxyapatite (HA) or BCP mixtures. Dilatometric measurements indicated that shrinkage of compacted CaP powders occurred first at around 650 degrees C and continued up to 1200 degrees C. The amorphous CaP powders were mixed with urea beads, compacted under isostatic pressure at 140 MPa and sintered at 1100 degrees C for 5 h. Scanning electron microscopy indicated that macro-microporous ceramics were produced. The ceramics had spherical macropores of 700-1200 mu m in diameter, with limited interconnections and a macroporosity of 42% as determined by microcomputed tomography. The micropores ranged from 0.1 to 1 mu m in diameter. These ceramics made of HA, beta-TCP or BCP exhibiting both macroporosity and microporosity can be used as bone fillers. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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