The effect of powder processing on densification, microstructure and mechanical properties of hydroxyapatite

Thangamani, Nithyanantham and Chinnakali, Kandasamy and Gnanam, FD (2002) The effect of powder processing on densification, microstructure and mechanical properties of hydroxyapatite. In: Ceramics International, 28 (4). 355-362 .

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Abstract

The influence of powder processing and sintering temperature on densification, microstructure and mechanical properties of hydroxyapatite (HAp) ceramics was studied. The as-dried, calcined and processed HAp powders were uniaxially compacted and sintered at various temperatures (1000-1400 degreesC) for 3 h. The as-dried and processed powders, attained 97% of theoretical density (TD) at 1100 degreesC) at higher sintering temperatures, the density of the as-dried powder compact was found to decrease. A uniform microstructure with fine grain size (2.3 pm) was observed for material obtained from processed powder, whereas exaggerated grain growth with closed pores were observed in as-dried and unprocessed powder compacts. The Vickers' hardness, fracture toughness and flexural strength of HAp were determined and a maximum value of 6.3 GPa and 0.88 MPam(1/2) and 60.3 MPa, respectively were obtained for processed compact. The processing of HAp has improved its densification, microstructure homogeneity and mechanical properties. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.

Item Type:	Journal Article
Publication:	Ceramics International
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	A.Sintering;C.Mechanical properties;D.Apatite;E.Biomedica l applications
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	27 Jul 2011 05:19
Last Modified:	27 Jul 2011 05:19
URI:	http://eprints.iisc.ac.in/id/eprint/39469

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