Liquid phase sintering of silica

Abstract

SiO2has been sintered in the presence of a silicate liquid containing CaO 23 %, Al2O315% and SiO262 %. Silicon dioxide powders of -45 and -75 + 63 micron particle sizes were taken and sintered with 10, 15 and 20% by weight liquid phase. Sintering temperatures were 1250°, 1300°, 1350° and 1400°C and soaking periods were from 1 to 30 minutes. Effects of liquid content of the compact and the sintering temperature were studied for the two particle sizes of SiO1Data were analysed using the empirical equation D = K log t + C and Arrhenius equation. It was found that activation energy of sintering decreased with the increasing amount of liquid phase and -45 micron SiO2sintered with much faster rate than -75 + 63 micron. © 1981 Taylor & Francis Group, LLC.