High Vacuum High Voltage High Pressure Metalized Ceramics for Power Grid Tubes and Vacuum Interrupters

ZG supplies custom Metalized Alumina Ceramics engineered for demanding applications requiring high vacuum, high voltage, and high pressure performance. These precision metallized ceramics serve as critical components in power grid tubes, vacuum interrupters, RF windows, metallized rings, and various specialized insulators and sensors.

Alumina stands as one of the most widely utilized engineering ceramic materials, delivering exceptional hardness, superior wear resistance, and outstanding electrical insulation characteristics. Our high-purity alumina ceramics (94-96% Al₂O₃) form the foundation of our products, with alternative ceramic materials available to meet specific application requirements.

Our standard metalized alumina ceramics employ molybdenum-based paints followed by precision nickel plating. A specialized coating formulation containing molybdenum and manganese particles combined with glass additives and volatile carriers is meticulously applied to the ceramic surface through hand-painting, spraying, or robotic application methods.

Following air drying, the coating undergoes controlled firing in a wet hydrogen environment at temperatures ranging from 1450°-1600°C. This process yields a robust "glassy" metallic coating measuring 300-500 micro-inches (7.6-12.7 microns) thick, ensuring exceptional bond strength between the metallized layer and ceramic substrate.

The fired coating is subsequently plated with a 0.001-0.003 inch (25.4-76.2 microns) nickel layer. The nickel plating undergoes sinter-firing at 850-950°C in a dry hydrogen atmosphere, producing a finished metallic surface optimized for brazing with standard braze filler metals.