Ceramic to Metal Seal

Ceramic to Metal Seal

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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Custom Ceramic-to-Metal Seals for Hermetic Electrical Assemblies

Ceramic-to-metal seals protect sensitive electronic components from moisture, gas leakage, and environmental contamination. A poorly designed joint can cause hermetic failure, electrical insulation problems, or premature equipment failure.

Meetcera provides custom ceramic-to-metal joining solutions for applications that require reliable sealing and electrical isolation.

Hermetic Sealing and Electrical Insulation

Ceramic-to-metal seals join an insulating ceramic body to a metal housing or conductor. Alumina ceramic is widely used for its electrical insulation, while Kovar and stainless steel are common metal options.

The right combination depends on your operating conditions and sealing requirements. Our ceramic-to-metal brazing solutions help create strong, permanent joints when the materials and brazing process are properly matched.

Custom ceramic-to-metal sealing components

Material Selection and Joint Reliability

Material selection directly affects seal strength and long-term reliability. Ceramic grade, metal composition, metallization, and brazing alloy must work together.

Thermal expansion mismatch is a key risk

When ceramic and metal expand or contract at different rates, stress can build up during temperature changes and damage the joint.

Meetcera’s ceramic metallization capabilities can support suitable joining designs, depending on the materials and component geometry.

For hermetic assemblies, define the target leak rate and test method before production. This helps establish clear acceptance criteria for prototype evaluation and quality control.

Manual inspection of gas-tight ceramic-to-metal components

Typical Applications

Ceramic-to-metal seals are used in assemblies where electrical insulation and environmental sealing are both essential, including:

  • Vacuum equipment: Maintain sealed interfaces in vacuum systems.
  • Semiconductor equipment: Protect sensitive components from contamination.
  • X-ray tubes: Support high-voltage insulation and sealed operating environments.
  • Industrial sensors: Isolate electrical connections in demanding conditions.
  • Aerospace systems: Support reliable connections under strict operating requirements.

Discuss Your Custom Sealing Requirements

Need a ceramic-to-metal seal for a specific application? Share your design details so the material combination and joining process can be evaluated before production.

Useful information includes:

  • Ceramic material and grade
  • Metal housing or conductor material
  • Component dimensions and tolerances
  • Operating temperature and pressure
  • Electrical insulation requirements
  • Target leak rate and testing standard

Meetcera can review your requirements and discuss material selection, metallization, brazing, and prototype testing.

If your design also requires electrical conductors to pass through a vacuum boundary, explore our custom ceramic vacuum feedthrough solutions.

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