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Characterization of high-fracture toughness K-fluorrichterite-fluorapatite glass ceramics

Mirsaneh, M., Reaney, I.M., Hatton, P.V. and James, P.F. (2004) Characterization of high-fracture toughness K-fluorrichterite-fluorapatite glass ceramics. Journal of the American Ceramic Society, 87 (2). pp. 240-246. ISSN 0002-7820

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Abstract

Stoichiometric K-fluorrichterite (Glass A) and the same composition with 2 mol% P2O5 added (Glass B) were prepared and then heat-treated isothermally from 550°1000°C with 50°C intervals. Samples were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The biaxial flexural strength and indentation fracture toughness of heat-treated glass specimens were also determined for both materials. XRD traces and TEM images showed similar phase evolution and fine microstructures for both systems at ≤950°C, with mica and diopside reacting with residual glass to form K-fluorrichterite as the temperature was increased from 650°C. However, in Glass B, fluorapatite was also present at >800°C. In contrast, coarser microstructures were observed at 1000°C, with larger K-fluorrichterite (20 μm) and enstatite (10 μm) crystals in Glasses A and B, respectively. The highest fracture toughness (2.69 ± 0.01 MPa·m(1/2)) and biaxial strength (242.6 ± 3.6 MPa) were recorded for Glass B heat-treated at 1000°C. This was attributed to the presence of enstatite coupled with an interlocked lath-like crystalline microstructure.

Item Type: Article
Copyright, Publisher and Additional Information: © 2004 Blackwell Publishing Ltd. This is an electronic version of an article published in Journal of the American Ceramic Society: complete citation information for the final version of the paper, as published in the print edition of Journal of the American Ceramic Society, is available on the Blackwell Synergy online delivery service, accessible via the journal's website at www.blackwellpublishing.com/journal.asp?ref=0002-7820 or www.blackwell-synergy.com
Academic Units: The University of Sheffield > University of Sheffield Research Centres and Institutes > Centre for Biomaterials and Tissue Engineering (Sheffield)
The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Dentistry (Sheffield)
Depositing User: Repository Officer
Date Deposited: 27 May 2005
Last Modified: 08 Feb 2013 16:47
Published Version: http://www.blackwellpublishing.com/journal.asp?ref...
Status: Published
Refereed: Yes
Identification Number: 10.1111/j.1551-2916.2004.00240.x
URI: http://eprints.whiterose.ac.uk/id/eprint/501

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