EXPOENTE DE AVRAMI PELA EQUAÇÃO DE JMAK PARA MÉTODO NÃO-ISOTÉRMICO DE ANÁLISE TÉRMICA

Salmo Moreira Sidel; Elio Idalgo; Keizo Yukimitu; João Carlos Silos Moraes; Fabio Alencar dos Santos

doi:10.30609/jeti.v1i2.5566

Salmo Moreira Sidel Universidade Federal do Tocantins - UFT
Elio Idalgo Universidade Paulista - UNIP
Keizo Yukimitu Faculdade de Engenharia de Ilha Solteira - FEIS/UNESP
João Carlos Silos Moraes Faculdade de Engenharia de Ilha Solteira - FEIS/UNESP
Fabio Alencar dos Santos UFGD - Universidade Federal da Grande Dourados

DOI: https://doi.org/10.30609/jeti.v1i2.5566

Abstract

This work reports a discussion about of the general theory for phase transformations of Melh-Johnson-Avrami-Kolmogorov in process involving non-isothermal crystallization. This model allows determine as occurs the mechanism of the nucleus formation and of growth of crystalline phases during the crystallization process. To demonstrate the validity this theory, the Avrami exponent (n) of the LiO₂-TeO₂-WO₃ vitreous system was determined from DSC non-isothermal measurements. The obtained results indicate that the nucleation process is volumetric with two-dimensional or three-dimensional crystal growth.

DOI: http://dx.doi.org/10.30609/JETI.2018-2.5566

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