Crystallization and sintering studies on an anomalous Li2O-Al2O3-SiO2 glass for making tunable thermal expansion ceramic

This work is an attempt to understand the crystallization behavior of unconventional LAS (1:1.2:7) composition having MgO, BaO, K2O, and ZrO2. Crystallization parameters were determined using thermo-analytical models based on differential scanning calorimetry (DSC). The activation energy of crystallization, E, and frequency factor, nu were calculated to be 354.40 kJ mol(-1 )K(-1) and 1.63 x 10(,)(15) respectively. Effect of sintering temperature on density, phase constitution, thermal expansion, and microstructure is reported herein. The temperature range between 1373 K and 1473 K was found to be the optimum window for sintering the glass particles. Glass-ceramic with CTE matching the Fe-Ni alloy is reported herein. Considering the LAS glass system's better sinterability, efforts were made toward sintering alumina with LAS glass as a sintering aid. The 5 wt%. LAS/Al2O3 composite was prepared with density: 3.6 g/cm(3), relative permittivity 10.5, and dielectric loss tangent 2.45 x 10(-3). This composition was found to be a potential CTE compensator material while processing tailorable CTE ceramics.