95% Alumina Metallized Cylinder For Vacuum Interrupters

95% Alumina Metallized Cylinder For Vacuum Interrupters

No. Parameter Typical Value / Specification Unit
1 Alumina Purity 95%or 99%  %
2 Bulk Density ≥ 3.63 g/cm³
3 Thermal Conductivity (25°C) 22.45 W/m·K
4 Coefficient of Thermal Expansion (20–1000°C) 8.26 ×10⁻⁶/°C
5 Flexural Strength ≥340 MPa
6 Dielectric Strength ≥8.3 kV/mm
7 Dielectric Constant (1 MHz) 9.1 @1MHz
8 Dielectric Loss (1 MHz) ≤0.0004 @1MHz
9 Metallization Layer (Mo/Mn) 15–25  μm
10 Plating Layer (Ni/Cu/Au etc.) 8–10   μm
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95% Alumina Metallized Cylinder For Vacuum Interrupters

1. Product Superiority

  • Superior Mechanical & Structural Support: Designed to handle high compressive loads while maintaining absolute electrical isolation. This solves the “structural collapse” risk in heavy-duty power equipment where standard insulators might fail under stress.
  • Engineered Thermal Expansion (CTE) Matching: Our Mo-Mn metallization and base alumina are precisely formulated to match the thermal expansion of Kovar and Copper alloys. This solves the “thermal cracking” issue during extreme temperature cycling in industrial furnaces or power modules.
  • Exceptional Dielectric Strength: With a dielectric strength exceeding 15 kV/mm, our cylinders prevent internal breakdown and surface tracking. This provides a 25% higher safety margin for high-voltage power supply designers compared to lower-grade ceramics.
  • Ultra-Smooth Precision Ground Finish: Each cylinder can be ground to a surface roughness of Ra 0.4μm. This solves the problem of “micro-arcs” caused by surface irregularities, ensuring a stable electrical field in vacuum environments.

2.Metallized Ceramics Joining types:

  • Ceramic + Mo/Mn Metallized + plating Ni
  • Ceramic + Mo/Mn Metallized + plating Ag
  • Ceramic + Mo/Mn Metallized + plating Au
  • Ceramic + printing Ag

3. Product Description

In high-power industrial and scientific applications, a ceramic insulator isn’t just a component—it’s a critical safety barrier. Whether you are managing the grid-scale power of a vacuum interrupter or the precision of a semiconductor etch tool, the mechanical and electrical integrity of your standoffs is paramount. Our Metallized Alumina Ceramic Cylinders are engineered for those who require ultimate reliability in the face of extreme voltage and physical stress.

Utilizing high-purity 95%-99.7% Alumina, these cylinders feature a robust Mo-Mn metallization layer co-fired at temperatures exceeding 1300°C. This ensures a chemical bond that is practically inseparable from the ceramic substrate. Ideal for vacuum interrupters, RF power tubes, and high-voltage standoffs, our cylinders offer low outgassing and high hermeticity (<1×10⁻¹⁰ mbar·l/s), making them the industry standard for UHV (Ultra-High Vacuum) systems and aerospace power modules.

We simplify the complexity of ceramic-to-metal integration. By providing precision-machined, ready-to-braze cylinders, we help you reduce assembly rejection rates and accelerate your product development cycle. Our commitment to ISO-certified quality and 100% helium leak testing ensures that every part meets your most rigorous performance specifications. Contact us today to discuss your custom dimensions and let us provide the structural insulation your high-power project demands.

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