Mechanical properties and microstructure of centrifugally compacted alumina and hot-isostatically-pressed alumina

被引：23

作者：

Koike, J ^{[1
]}

Tashima, S ^{[1
]}

Wakiya, S ^{[1
]}

Maruyama, K ^{[1
]}

Oikawa, H ^{[1
]}

机构：

[1] HIROSHIMA UNIV,FAC SCH EDUC,HIGASHIHIROSHIMA,JAPAN

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1996年 / 220卷 / 1-2期

关键词：

alumina; centrifugal compaction; mechanical property; grain-boundary phase;

D O I：

10.1016/S0921-5093(96)10439-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

High purity alumina powder was compacted under a high centrifugal force. Mechanical properties of the sintered body were studied by the three-point bending test at room temperature and by the compressive test at elevated temperatures. Comparison was made with hot-isostatically-pressed (HIP) alumina. The room-temperature flexural strength of the centrifugally compacted (CC) alumina was found to be 1330 MPa compared with 585 MPa of the HIP alumina. The difference in the room-temperature strength was attributed to the presence of the amorphous phase along the grain boundaries of the HIP alumina caused by the segregation of carbon and sulfur during HIP. A large ductility was observed above 1473 K in the CC alumina and above 1573 K in the HIP alumina. High-temperature ductility was lost in the HIP alumina at 1773 K where the amorphous grain-boundary phase was considered to be melted.

引用

页码：26 / 34

页数：9

共 23 条

[1] ROLE OF GRAIN-SIZE IN THE STRENGTH AND R-CURVE PROPERTIES OF ALUMINA [J].