Crystallization kinetic and thermal and electrical properties of β-spodumeness/cordierite glass–ceramics

Abstract

The aim of the present work was to investigate the crystallization kinetic of spodumene-/cordierite-based glass–ceramics. Thus, three glasses were prepared with compositions based predominantly on cordierite and β-spodumeness crystalline phases, and a mass ratio 1:1 of both phases. The kinetic parameters were determined by means of non-isothermal methods using differential thermal analysis. A multi-peaks fit method was used based on the Fraser–Suzuki equation to determine the crystallization temperature peak. The crystallization kinetic was investigated using the Ozawa and Kissinger methods. The samples were crystalized according to DTA analyses and characterized by using X-ray diffraction. Additionally, the coefficient of thermal expansion and electrical properties of the glass–ceramics was determined. The results showed activation energy for crystallization ranging from 121 to 333 kJ mol−1. The main crystalline phases were β-spodumeness to composition L, cordierite and β-quartzss to composition C and β-quartzss and spinel to composition CL. Taking into account the thermal and electrical properties of the heat-treated samples, these glass–ceramics show potential to LTCC (low thermal co-fired ceramics) application.