T-T-T behaviour of bioactive glasses 1-98 and 13-93

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Fagerlund S, Massera J, Hupa M, Hupa L
Förläggare: ELSEVIER SCI LTD
Publiceringsår: 2012
Tidskrift: Journal of the European Ceramic Society
Tidskriftsakronym: J EUR CERAM SOC
Volym: 32
Nummer: 11
Artikelns första sida, sidnummer: 2731
Artikelns sista sida, sidnummer: 2738
Antal sidor: 8
ISSN: 0955-2219


Abstrakt

In this work crystallization kinetics of bioactive glasses 1-98 and 13-93 are discussed. Within a certain temperature time window these glasses can be hot worked into various products without interfering with crystallization. The crystallization was studied isothermally by heating glass plates at different temperatures for different times. Phases in the samples were studied through XRD and SEM analyses. The nucleation-like curves and crystallization characteristics were measured with DTA. The temperature of maximum nucleation was measured for glass 1-98 at 725 degrees C and for 13-93 at 700 degrees C. The activation energy of crystallization of both glasses was 280 kJ/mol. The Johnson-Mehl-Avrami exponent and the SEM micrographs of the samples suggested surface crystallization. The primary crystalline phase was wollastonite. The growth rate of the crystallized surface layer was 1 order of magnitude higher in the plates of 1-98 than in 13-93. The results can be utilized to optimize the parameters in hot-working of the glasses.


Nyckelord

Biomedical application, Glass, Hot-working, Thermal properties

Senast uppdaterad 2019-13-12 vid 03:47