Vacuum interrupter metallized ceramic shell and its processing technology

By optimizing the processing technology of the metallized ceramic shell of the vacuum interrupter, and by adopting technologies such as pickling, ultra-low moisture content, electromagnetic iron removal, and high-precision polishing, the insulation problem of the metallized ceramic shell in high-voltage vacuum interrupters has been solved, enabling applications at higher voltage levels.

CN122520443APending Publication Date: 2026-08-07SHAANXI BAOGUANG CERAMIC SCIENCE TECHNOLOGY CO LTD +2
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Patent Information

Application Number
CN202610565205.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-27
Publication Date
2026-08-07

AI Technical Summary

Technical Problem

Existing metallized ceramic shells have microscopic defects such as closed pores, trace impurities, and surface roughness in high-voltage vacuum interrupters, which lead to partial discharge and insulation failure, making it difficult to meet the application requirements of higher voltage levels.

Method used

An α-alumina suspension treated with acid washing, combined with ultra-low moisture content and electromagnetic iron removal process, is used for programmed temperature sintering and high-precision polishing, along with inorganic glazes, to optimize the insulation performance and surface roughness of the ceramic shell and ensure uniform glaze coverage.

Benefits of technology

It significantly improves the insulation and mechanical strength of the ceramic shell, reduces the risk of conductive paths, and meets the performance requirements of high-voltage vacuum interrupters.

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Abstract

This invention belongs to the field of ceramic equipment manufacturing technology, and discloses a metallized ceramic shell for a vacuum interrupter and its processing technology. The process uses low-sodium α-alumina with 0.5~1μm grain size as raw material, and acid washing improves its chemical purity and grain boundary stability. During granulation, the moisture content is controlled to ≤0.1%, and homogenization is used to remove iron and eliminate conductive impurities. A drying process is added between pressing and turning to improve processing precision. Through programmed temperature sintering combined with atmosphere control, the crystal structure is optimized and organic matter and gases are expelled, avoiding closed pore defects. After firing, polishing reduces surface roughness and prevents dust adsorption and conductivity. The glazing process uses bentonite and silica to adjust the glaze viscosity, ensuring uniform glaze coverage and matching the thermal expansion of the ceramic body, improving the outer surface insulation performance. The synergistic effect of each step comprehensively improves the purity, density, and surface quality of the ceramic shell, effectively meeting the stringent insulation strength requirements of high-voltage vacuum interrupters.
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