Sol-Gel synthesis of high-temperature aluminosilicate glass-ceramies and composite materials on its basis

摘要

Powders of strontium aluminosilicate glass-ceramics were synthesized by a sol-gel method. Composite materials based on them with the addition of industrial powders α-Si3N4, β-Si3N4, Y2O3, ZrO2 and HfO2 were obtained by the method of spark plasma sintering. It was found that reinforcement with silicon nitride leads to an increase in K_(1C) of glass-ceramics by more than 2 times. The temperature of sintering and the properties of composite materials (CM) are complexly dependent on the nature of the refractory oxide. Maximum strength is typical for CM containing Y2O3 additive, and maximum microhardness is for material with HfO2 additive. Modification by refractory oxides leads to an improvement in oxidation resistance of composite materials.