Effects of MgO on the sintering and vacuum flashover performance of the chromium and manganese doped Al2O3 ceramics

The Al 2 O 3 ceramics with high flashover voltage were prepared by powder metallurgic method. The surface voltage-withstanding performance of Cr and Mn doped Al 2 O 3 ceramic was improved obviously with the addition of small amount of MgO. The crystalline phases were identified by XRD and the micros...

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Bibliographic Details
Published in2021 22nd International Vacuum Electronics Conference (IVEC) pp. 1 - 2
Main Authors Feng, Dandan, Wang, Xiaojing, Zhao, Shike
Format Conference Proceeding
LanguageEnglish
Published IEEE 27.04.2021
Subjects
Al 2 O 3
Ceramics
Electronic Ceramics
Flashover
MgO
Microstructure
Sintering
Surface Flashover Voltage
Vacuum Electronic Device
Vacuum electronics
Voltage
X-ray scattering
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Summary:The Al 2 O 3 ceramics with high flashover voltage were prepared by powder metallurgic method. The surface voltage-withstanding performance of Cr and Mn doped Al 2 O 3 ceramic was improved obviously with the addition of small amount of MgO. The crystalline phases were identified by XRD and the microstructures were observed by SEM, the results showed that the addition of MgO could inhibit the grain growth and promote the sintering of Al 2 O 3 ceramic. When 0.5 wt.% MgO was added, the Cr and Mn doped Al 2 O 3 ceramics had homogeneous microstructure and the vacuum hold-off voltage reached to 24 kV, which was 20 % higher than that without MgO.
DOI:10.1109/IVEC51707.2021.9722487