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Effects of alumina on the thermal processing of apatite-wollastonite: changes in sintering, microstructure and crystallinity of compressed pellets

Lookup NU author(s): Dr Priscila MeloORCiD, Dr Piergiorgio GentileORCiD, Professor Kenneth Dalgarno


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In this work we investigated the sintering behaviour of apatite-wollastonite (AW) glass-ceramic powders with the presence of alumina, firstly detected as a potentially useful surface contaminant derived from the ball milling of the powder, and then as a dopant in the glass formulation. All powders were benchmarked against AW without alumina. A small percentage of contamination (0.14 wt%) showed to delay the melting of material, and lower densification derived from a lower ability to crystallize and higher stability in the glassy states. The doped AW revealed that an increase in alumina favoured the formation of a glassy phase, increasing the degree of necking and the development of crystals. In conclusion, the introduction of alumina improves the AW glass-ceramic processability when content and process parameters are optimized.

Publication metadata

Author(s): Melo P, Kotlarz M, Marshall M, Magallanes M, Ferreira AM, Gentile P, Dalgarno K

Publication type: Article

Publication status: Published

Journal: Journal of the European Ceramic Society

Year: 2020

Volume: 40

Issue: 15

Pages: 6107-6113

Print publication date: 01/12/2020

Online publication date: 29/06/2020

Acceptance date: 27/06/2020

Date deposited: 09/07/2020

ISSN (print): 0955-2219

ISSN (electronic): 1873-619X

Publisher: Elsevier Ltd


DOI: 10.1016/j.jeurceramsoc.2020.06.071


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