Solid-state synthesis and formation mechanism of barium hexaaluminate from mechanically activated Al2O3-BaCO3 powder mixtures

被引：13

作者：

Nugroho, Sri ^{[1
]}

Chen, Zhong-Chun ^{[1
]}

Kawasaki, Akira ^{[1
]}

Jarligo, M. O. D. ^{[2
]}

机构：

[1] Tohoku Univ, Dept Mat Proc, Grad Sch Engn, Sendai, Miyagi 9808579, Japan

[2] Forschungszentrum Julich, Inst Energy Res IEF1, D-52428 Julich, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 502卷 / 02期

关键词：

Oxide materials; Ba-beta-Al2O3; High-energy planetary ball milling; Mechanical activation; Solid-state synthesis; X-ray diffraction; BETA-ALUMINA; HEXA-ALUMINATE; COMPOSITES; MICROSTRUCTURE; PRECIPITATION; PRODUCTS;

D O I：

10.1016/j.jallcom.2010.04.198

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The synthesis and formation mechanism of barium hexaaluminate compound (Ba-P-Al2O3) by solid-state reactions between powdered reactants of alumina (Al2O3) and barium carbonate (BaCO3) have been investigated. The processes for synthesizing Ba-beta-Al2O3 phase include mechanically activated milling of Al2O3-BaCO3 powder mixtures and subsequent solid-state reactions at high temperatures. The mechanically activated milling results in a significant decrease in the decomposition temperature of BaCO3, hence promotes its reactions with Al2O3. Almost monophasic Ba-beta-Al2O3 can be synthesized by 9-12 h ball milling, followed by heat treatment at 1500 C for 2 h. The formation of Ba-beta-Al2O3 phase includes three stages: (i) decomposition of BaCO3, (ii) formation and growth of spherical BaO center dot Al2O3 particles, and (iii) reaction between Al2O3 and BaO center dot Al2O3 to form Ba-beta-Al2O3 with an elongated morphology. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：466 / 471

页数：6

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