Evolution of mechanical properties of porous alumina during free sintering and hot pressing

被引：75

作者：

Ostrowski, T ^{[1
]}

Rödel, J ^{[1
]}

机构：

[1] Univ Technol Darmstadt, Ceram Grp, D-64287 Darmstadt, Germany

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1999年 / 82卷 / 11期

关键词：

D O I：

10.1111/j.1151-2916.1999.tb02206.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：

This comparative study addresses the influence of microstructural evolution on mechanical properties of porous alumina sintered with and without the application of uni-axial pressure. A complete set of data on Young's modulus, long-crack fracture toughness, and fracture strength for two alumina powders as a function of density was obtained. The evolution of fracture strength with increased density was modeled using a porosity-dependent crack-tip fracture toughness, linked to the contact area of grains and a porosity-dependent size of the largest defect. The defect shape factor was found independent of porosity. A uniaxial pressure of 13 MPa during densification had negligible effect on the relation of strength to porosity.

引用

页码：3080 / 3086

页数：7

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