A shape factor of sintering glass particles from the crystallization kinetics determined by DSC

• Grant number: 13/09234-4
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): September 01, 2013
• Effective date (End): August 31, 2016
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Eduardo Bellini Ferreira
• Grantee: Roger Gomes Fernandes
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated research grant: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass, AP.CEPID

Abstract

Glass sintering with concurrent crystallization is an alternative route for the production of glass-ceramics. During this process both densification and formation of crystalline phase happens at the same temperature. However the crystallization occurs from the surface of the glass particles and may limit the sintering and densification of a particle compact. The sintering kinetics of glass particles can be well describe by the Clusters model, which enables one to predict whether sintering happens and how the relative density changes with a particular thermal treatment. Although the experimental results fit well to the model, it must be enhanced to precisely account for the particle shape and packing parameters. Particularly, until now, the shape parameter is used empirically, i.e., a correction factor for the particles shape is considered in the model, which is actually obtained by adjusting the Clusters model to experimental data. This study aims to better understand the effect of the shape of glass particles in their sintering kinetics with concurrent crystallization. We propose to determine a shape factor of particles independently of the Clusters model, by calculating their crystallization kinetics and comparing them with experimental data of Differential Scanning Calorimetric (DSC). Finally the shape factor thus obtained will be tested into the Clusters model against experimental data of sintering kinetics. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FERNANDES, R. G.; FERREIRA, E. B.. The shape of diopside glass particles probed by the non-isothermal crystallization kinetics and Differential Scanning Calorimetry. Journal of Non-Crystalline Solids, v. 497, p. 63-70, OCT 1 2018. (13/09234-4, 13/07793-6)

FERNANDES, ROGER G.; REIS, RAPHAEL M. C. V.; TOBAR, RAUL R.; ZANOTTO, EDGAR D.; FERREIRA, EDUARDO B.. Simulation and experimental study of the particle size distribution and pore effect on the crystallization of glass powders. ACTA MATERIALIA, v. 175, p. 130-139, AUG 15 2019. (13/09234-4, 13/07793-6)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

FERNANDES, Roger Gomes. The effect of particle size and shape in the crystallization kinetics of diopside glass powders detected by DSC. 2017. Doctoral Thesis - Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) São Carlos.