Abstract
Bulk doping was taken into consideration to improve the surface voltage hold-off performance of alumina insulators in vacuum. The as-blended 95% alumina powder was selected as initial powder to be doped with proper Cr2O3 and MnCO3. The results of properties measurements and experiments showed that samples doped with proper Cr2O3 and MnCO3 possessed better surface properties compared with original 95% alumina insulators. The doped samples displayed higher surface breakdown strength and performed better metallization properties after being metallized through a newly designed method. Both the surface resistivity and the secondary electron emission coefficient of alumina were decreased significantly after manganese and chromium doping, which resulted in the improvement of surface insulating performance. In addition, some points concerning the influences of manganese and chromium doping on the structures and properties of alumina insulators were also briefly discussed upon analyses on composition and structure of ceramic samples.
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