High temperature mechanical behavior of polycrystalline alumina from mixed nanometer and micrometer powders

被引：14

作者：

Goldsby, JC ^{[1
]}

机构：

[1] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA

来源：

CERAMICS INTERNATIONAL | 2001年 / 27卷 / 06期

关键词：

hot pressing; mixing; mechanical properties; Al2O3;

D O I：

10.1016/S0272-8842(01)00023-2

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：

Sintered aluminum oxide materials were formed using commercial methods from mechanically mixed powders of nano- and micrometer alumina. The powders were consolidated at 1500 and 1600 degreesC with 3.2 and 7.2 ksi applied stress in argon. The conventional micrometer sized powders failed to consolidate. While 100% nanometer-sized alumina and its mixture with the micrometer powders achieved > 99% density. Preliminary high temperature creep behavior indicates no super-plastic strains. However high strains ( > 0.651%)were generated in the nanometer powder, due to cracks and linked voids initiated by cavitation. (C) 2001 Elsevier Science Ltd and Techna S.r.l. All rights reserved.

引用

页码：701 / 703

页数：3

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