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

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

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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.

Item Type: Article
Funders: FRGS grant (FP0202018A)
Uncontrolled Keywords: Fluorapatite; Quartz; Composites; Sintering behaviour
Subjects: Q Science > QC Physics
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering > Department of Mechanical Engineering
Faculty of Science > Department of Physics
Depositing User: Ms Zaharah Ramly
Date Deposited: 07 Sep 2022 07:43
Last Modified: 07 Sep 2022 07:43

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