PROCESSING AND PROPERTIES OF CELLULAR SILICA SYNTHESIZED BY FOAMING SOL GELS

被引：65

作者：

FUJIU, T

MESSING, GL

HUEBNER, W

机构：

[1] Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 01期

关键词：

fabrication; foamed ceranics; silica; sols; viscosity;

D O I：

10.1111/j.1151-2916.1990.tb05095.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A novel process for fabricating lightweight, cellular ceramics from sols is presented. The process utilizes the rapid viscosity change during gelation to stabilize the structure of a foamed silica sol. Manipulation of gel viscosity and foaming agent concentration resulted in a minimum cell size of 90 μm at 31% density and minimum density of 17% with average cell size of 400 μm. The flexural strength compared favorably with space shuttle tiles and sintered hollow glass spheres. From −50° to 150°C, the dielectric constant ranged from 1.51 to 1.55 for a 20% dense foam and was slightly dispersive, whereas the dielectric loss was comparable with fused silica. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：85 / 90

页数：6

共 16 条

[1] FRACTURE-BEHAVIOR OF OPEN-CELL CERAMICS [J].