Dry pressing boehmite gels for the fabrication of monolithic α-Al2O3

被引：1
|
作者：
Seongtae Kwon
Gary L. Messing
机构：
[1] Pennsylvania State University,Department of Materials Science and Engineering, The Particulate Materials Center
来源：
Journal of Sol-Gel Science and Technology | 1997年 / 9卷 / 1期
关键词：
boehmite gel; agglomerates; dry pressing; sintering; alumina;
D O I：
10.1007/BF02439336
中图分类号：
学科分类号：
摘要：
It is demonstrated that dense alpha alumina can be fabricated by pressing ethanol-dispersed, α-Al2O3 seeded boehmite. Green bodies were formed by uniaxially pressing either water or ethanol dispersed gel powder and then isostatically pressing the compacts at 280 MPa. Green microstructure and alumina densification are correlated with gel agglomerate size and dispersing medium. The ethanol-dispersed specimens showed better sinterability than the water-dispersed specimens, and sintered to more than 99% theoretical density at 1300°C. It is shown that softer gel agglomerates were obtained by alcohol dispersion and resulted in better green microstructure and higher sintered density.
引用
收藏
页码：53 / 64
页数：11
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