Liquid phase assisted hot pressing of boron suboxide-materials

被引：34

作者：

Andrews, A. ^{[2
]}

Herrmann, M. ^{[1
]}

Shabalala, T. C. ^{[2
]}

Sigalas, I. ^{[2
]}

机构：

[1] Fraunhofer Inst Ceram Technol & Syst IKTS, D-01277 Dresden, Germany

[2] Univ Witwatersrand, Sch Chem & Met Engn, ZA-2050 Wits, Johannesburg, South Africa

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2008年 / 28卷 / 08期

关键词：

boron suboxide; thermodynamic properties; liquid phase; sintering; hot pressing; B6O;

D O I：

10.1016/j.jeurceramsoc.2007.10.011

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：

B6O composites were prepared by hot pressing of B6O powder with alumina, aluminium and carbon additions. Dense materials with hardness higher than 30 GPa and fracture toughness of 3 MPa m(1/2) Were achieved at 1900 degrees C. The sintering behaviour and the formed phases were discussed on the bases of thermodynamic calculations. The thermodynamic properties of boron suboxide (B6O) were approximated at high temperatures. The phase equilibria computed lased on the obtained thermodynamic properties, agree with the available experimental data. The modelled thermodynamic properties of B6O have been applied to analyse interpretation of the sintering behaviour and the stability of these materials. The thermodynamic calculations and microstructural analysis showed that the densification takes place by liquid phase sintering. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1613 / 1621

页数：9

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