High pressure compaction and sintering of nano-size gamma-Al2O3 powder

被引:16
作者
Gonzalez, EJ [1 ]
Hockey, B [1 ]
Piermarini, GJ [1 ]
机构
[1] NIST,DIV CERAM,GAITHERSBURG,MD 20899
关键词
D O I
10.1080/10426919608947544
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effects of pressure on the compaction and subsequent sintering of nanosize gamma-Al2O3 powder were studied. Pressures up to 5 GPa were used to compact the powder in a WC piston/cylinder type die and also in a diamond anvil cell. The green body compacts obtained from both methods of compaction were pressureless sintered at temperatures between 1000 degrees C to 1600 degrees C. Results demonstrated that green body density was enhanced with increased compaction pressure. For compaction pressures less than 3 GPa, microstructures containing significant porosity developed at all sintering temperatures studied and is due to the development of a highly porous or vermicular structure during the gamma to alpha phase transformation, occurring at temperatures between 1000 degrees C and 1150 degrees C. At compaction pressures greater than 3 GPa, however, the formation of the vermicular structure did not occur and near theoretical densities with grain size approximate to 150 nm were obtained.
引用
收藏
页码:951 / 967
页数:17
相关论文
共 11 条
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YEH, TS ;
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