Heating rate effects in nucleation of glasses: from lab to practice

• Grant number: 16/11650-4
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• Start date: September 16, 2016
• End date: February 15, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Edgar Dutra Zanotto
• Grantee: Edgar Dutra Zanotto
• Visiting researcher: Joachim Michael Deubener
• Visiting researcher institution: Clausthal University of Technology (TU Clausthal), Germany
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated research grant: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass, AP.CEPID

Abstract

This project aims at exploring heating rate effects in crystal nucleation of glasses. Experiments are proposed in which defined heating rates will be used. Crystal number densities, nucleation rates and final microstructure of glass-ceramics resulting from these heat treatments will be measured. A systematic change in the heating rate allows for a correlation between these parameters from which determining equations will be derived to quantify the effect. The results will be compared with numerical solutions in order to find out the obstacles in the current description of non-isothermal nucleation. In order to achieve further simplification, lab experiments will be carried out using few component, stoichiometric compositions, which will allow for polymorphic transformation. Concurrent diffusion of mobile species will be introduced by modifying the parent glass composition (off-stoichiometry) within the limits of solid solution crystals. Focusing on heating rate effects in laboratory experiments may allow a substantial leap towards implementing ceramming conditions of the industrial practice in the production of glass-ceramics. (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)

DEUBENER, J.; MONTAZERIAN, M.; KRUEGER, S.; PEITL, O.; ZANOTTO, E. D.. Heating rate effects in time-dependent homogeneous nucleation in glasses. Journal of Non-Crystalline Solids, v. 474, p. 1-8, OCT 15 2017. (15/13314-9, 13/07793-6, 16/11650-4)