A MODIFIED METHOD FOR PRODUCING CARBON-LOADED VACUUM-COMPATIBLE MICROWAVE ABSORBERS FROM A POROUS CERAMIC

被引：27

作者：

CALAME, JP

LAWSON, WG

机构：

[1] Laboratory for Plasma Research, University of Maryland, ML, 20742, College Park

来源：

IEEE TRANSACTIONS ON ELECTRON DEVICES | 1991年 / 38卷 / 06期

关键词：

Aluminum Compounds - Carbon - Ceramic Materials - Electron Tubes; Klystron; -; Microwaves;

D O I：

10.1109/16.81651

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The well-established procedure for producing microwave absorbers by carbon loading a porous ceramic has been modified to enhance the cleanliness of the final product and to improve the controllability of the loss tangent. The changes include soaking the ceramics in an acid bath to leach out undersirable metal oxides and a multiple-step carbonization using both carbon dioxide and hydrogen firings. These modifications allow the use of an aluminum silicate material known as Aremcolox(TM) 502-1100(1) as a starting material for absorbers in critical applications, such as a system with an osmium-coated dispenser cathode. The processing steps are described in detail and their relevance to the development of a high-peak-power X-band gyroklystron is discussed. Representative values of the complex dielectric constants at 9.9 GHz for various carbon contents are presented.

引用

页码：1538 / 1543

页数：6