Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz

In this work, the sintering behaviour of fluorapatite (FAp)-silicate composites prepared by mixing variable amounts of natural quartz (2.5 wt% to 20 wt%) and FAp was studied. The composites were pressureless sintered in air at temperatures from 1000 degrees C to 1350 degrees C. The effects of temper...

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Main Authors: Kherifi, D., Belhouchet, H., Ramesh, S., Lee, K. Y. Sara, Kenzour, A., Djoualah, S., Abbas, M. K. G., Wong, Yew Hoong
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Published: Elsevier 2021
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spelling my.um.eprints.342002022-09-07T07:43:33Z http://eprints.um.edu.my/34200/ Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz Kherifi, D. Belhouchet, H. Ramesh, S. Lee, K. Y. Sara Kenzour, A. Djoualah, S. Abbas, M. K. G. Wong, Yew Hoong Ramesh, S. QC Physics TJ Mechanical engineering and machinery In this work, the sintering behaviour of fluorapatite (FAp)-silicate composites prepared by mixing variable amounts of natural quartz (2.5 wt% to 20 wt%) and FAp was studied. The composites were pressureless sintered in air at temperatures from 1000 degrees C to 1350 degrees C. The effects of temperatures on the densification, phase formation, chemical bonding and Vickers hardness of the composites were evaluated. All the samples exhibited mixed phase, comprising FAp and francolite as the major constituents along with some minor phases of cristobalite, wollastonite, dicalcium silicate and/or whitlockite dependent on the quartz content and sintering temperature. The composite containing 2.5 wt% quartz exhibited the best sintering properties. The highest bulk density of 3 g/cm3 and a Vickers hardness of >4.2 GPa were obtained for the 2.5 wt% quartz-FAp composite when sintered at 1100 degrees C. The addition of quartz was found to alter the microstructure of the composites, where it exhibited a rod-like morphology when sintered at 1000 degrees C and a regular rounded grain structure when sintered at 1350 degrees C. A wetted grain surface was observed for composites containing high quartz content and was believed to be associated with a transient liquid phase sintering. Elsevier 2021-06-15 Article PeerReviewed Kherifi, D. and Belhouchet, H. and Ramesh, S. and Lee, K. Y. Sara and Kenzour, A. and Djoualah, S. and Abbas, M. K. G. and Wong, Yew Hoong and Ramesh, S. (2021) Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz. Ceramics International, 47 (12). pp. 16483-16490. ISSN 0272-8842, DOI https://doi.org/10.1016/j.ceramint.2021.02.216 <https://doi.org/10.1016/j.ceramint.2021.02.216>. 10.1016/j.ceramint.2021.02.216
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QC Physics
TJ Mechanical engineering and machinery
spellingShingle QC Physics
TJ Mechanical engineering and machinery
Kherifi, D.
Belhouchet, H.
Ramesh, S.
Lee, K. Y. Sara
Kenzour, A.
Djoualah, S.
Abbas, M. K. G.
Wong, Yew Hoong
Ramesh, S.
Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz
description In this work, the sintering behaviour of fluorapatite (FAp)-silicate composites prepared by mixing variable amounts of natural quartz (2.5 wt% to 20 wt%) and FAp was studied. The composites were pressureless sintered in air at temperatures from 1000 degrees C to 1350 degrees C. The effects of temperatures on the densification, phase formation, chemical bonding and Vickers hardness of the composites were evaluated. All the samples exhibited mixed phase, comprising FAp and francolite as the major constituents along with some minor phases of cristobalite, wollastonite, dicalcium silicate and/or whitlockite dependent on the quartz content and sintering temperature. The composite containing 2.5 wt% quartz exhibited the best sintering properties. The highest bulk density of 3 g/cm3 and a Vickers hardness of >4.2 GPa were obtained for the 2.5 wt% quartz-FAp composite when sintered at 1100 degrees C. The addition of quartz was found to alter the microstructure of the composites, where it exhibited a rod-like morphology when sintered at 1000 degrees C and a regular rounded grain structure when sintered at 1350 degrees C. A wetted grain surface was observed for composites containing high quartz content and was believed to be associated with a transient liquid phase sintering.
format Article
author Kherifi, D.
Belhouchet, H.
Ramesh, S.
Lee, K. Y. Sara
Kenzour, A.
Djoualah, S.
Abbas, M. K. G.
Wong, Yew Hoong
Ramesh, S.
author_facet Kherifi, D.
Belhouchet, H.
Ramesh, S.
Lee, K. Y. Sara
Kenzour, A.
Djoualah, S.
Abbas, M. K. G.
Wong, Yew Hoong
Ramesh, S.
author_sort Kherifi, D.
title Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz
title_short Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz
title_full Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz
title_fullStr Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz
title_full_unstemmed Sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz
title_sort sintering behaviour of fluorapatite-silicate composites produced from natural fluorapatite and quartz
publisher Elsevier
publishDate 2021
url http://eprints.um.edu.my/34200/
_version_ 1744649163480498176
score 13.209306