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

Fourth interdisciplinary scientific forum with international participation "New materials and promising technologies"

Chaynikova, A.S.^1 ; Shchegoleva, N.E.^1 ; Modin, S.Y.^1 ; Akopian, A.A.^1 ; Grashchenkov, D.V.^1 ; Vaganova, M.L.^1

All-Russian Scientific Research Institute of Aviation Materials, Moscow

105275, Russia^1

关键词: Aluminosilicate glass;    High temperature;    Maximum strength;    Properties of composites;    Refractory oxides;    Sol;    Gel synthesis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/525/1/012053/pdf
DOI  :  10.1088/1757-899X/525/1/012053

来源: IOP

【 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 K1C 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.