Author:
Sigaev V. N.,Naumov A. S.,Savinkov V. I.,Lipatiev A. S.,Lotarev S. V.,Klimenko N. N.,Lopatina E. V.
Abstract
The influence of the spheroidization process in the flow of high-temperature plasma of glass based on the Li2O–Al2O3–SiO2 (LAS) system doped with 1.0 mol. % Nd2O3 on its crystallization properties is investigated. The resulting microspheres with a size of 32 – 64 ?m are characterized by a significantly higher glass transition temperature Tg compared to the Tg of the initial glass (751 °C and 677 °C, respectively), which may be due to both a change in chemical composition during spheroidization and a fundamentally different thermal history of microspheres and glass. Despite the delayed crystallization kinetics, the glass-ceramic structure based on ?-eucryptite-like solid solutions of LixAlxSi1 – xO2 is formed in microspheres, as in the initial glass, under the action of heat treatment, indicating the possibility of both obtaining microspheres with the glass-ceramic structure and varying their coefficient of thermal expansion near zero values.
Publisher
Izdatel'skii dom Spektr, LLC