Microwave Dielectric Properties of 0.9Al2O3-0.1TiO2 Ceramics Prepared by Aqueous Gelcasting

被引：7

作者：

Wu Jia-Min ^{[1
]}

Lue Wen-Zhong ^{[1
]}

Liang Jun ^{[1
]}

Wang Xiao-Hong ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Dept Elect Sci & Technol, Wuhan 430074, Peoples R China

来源：

JOURNAL OF INORGANIC MATERIALS | 2011年 / 26卷 / 01期

关键词：

ceramics; dielectric properties; microstructures; 0.9Al(2)O(3)-0.1TiO(2); aqueous gelcasting; ALUMINA; ZNO;

D O I：

10.3724/SP.J.1077.2010.10365

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：

The aqueous gelcasting was used to prepare 0.9Al(2)O(3)-0.1TiO(2) ceramics. The microstructures, phase compositions and microwave dielectric properties of sintered 0.9Al(2)O(3)-0.1TiO(2) ceramics were investigated. With the help of proper calcination temperature (1200 C) and continuous and slow cooling process as annealing treatment, the Al2TiO5 secondary phase was successfully eliminated. Compared with conventional dry pressing method, bigger grains, less pores and more uniform microstructures are observed in the 0.9Al(2)O(3)-0.1TiO(2) ceramics prepared by aqueous gelcasting. Therefore, much better microwave dielectric properties are obtained in the ceramics prepared by aqueous gelcasting with epsilon(r) = 10.71, Q x f = 20421GHz, tau(f) = 1.3x10(-6)/degrees C, whereas that of ceramics prepared by dry pressing are epsilon(r) = 10.89, Q x f = 11938GHz, tau(f) = 1.4 x 10(-6)/degrees C.

引用

页码：102 / 106

页数：5

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