Reaction kinetics and microstructural evolution during the heating of high energy ball milled Al-TiO2 and Al-V2O5 composite powders

被引：7

作者：

Zhang, DL ^{[1
]}

Ying, DY ^{[1
]}

Adam, G ^{[1
]}

机构：

[1] Univ Waikato, Dept Mat & Proc Engn, Hamilton, New Zealand

来源：

METASTABLE, MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS | 2002年 / 386-3卷

关键词：

composite powders; microstructural evolution; solid state reaction;

D O I：

10.4028/www.scientific.net/MSF.386-388.287

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Solid state reactions and corresponding microstructural evolution of the powder particles during heating Al/TiO2 and Al/V2O5 composite powders produced by high energy ball milling have been studied. It is demonstrated that establishment and refining of the composite structure of the powder particles through milling strongly enhances the reaction kinetics. The enhancement is likely due to the creation of a large area of Al/oxide interfaces and the reduction of the inter-particle spacing of the oxide particles inside the powder particles. Al3Ti or Al3V or other Al rich AlxVy phase is the first phase to be formed from the reaction between Al and TiO2 or V2O5 which starts at a temperature close to the melting point of Al. When the Al/V2O5 composite structure is very fine, gamma-Al2O3 may also form from the initial reaction. The powders must be heated to above 900degreesC in order for alpha-Al2O3 to nucleate. At temperatures above 1000degreesC, Al3Ti is transformed into Ti(Al,O) by reacting with TiO2.

引用

页码：287 / 292

页数：6

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