Metallized Ceramic Components
Metallized 7-Wave Alumina Ceramic for Vacuum Interrupters
Metallized 7-Wave Alumina Ceramic for Vacuum Interrupters with Mo/Mn metallization for vacuum interrupters, high-voltage switching equipment and ceramic-to-metal brazing applications.
Overview
TecCera supplies Metallized 7-Wave Alumina Ceramic for Vacuum Interrupters designed for vacuum interrupters, high-voltage switching devices, vacuum electronic equipment, and ceramic-to-metal sealing applications.
The corrugated seven-wave structure increases the surface creepage path compared with a simple flat ceramic geometry, helping improve electrical insulation performance in compact high-voltage assemblies.
Manufactured from 95% or 99% alumina, the ceramic can be selectively metallized with a Mo/Mn layer and subsequently plated with nickel, copper, gold, or other compatible metals according to brazing and assembly requirements.
Custom dimensions, wave profiles, metallization areas, plating specifications, and tolerances are available based on customer drawings.
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Typical Technical Specifications
|
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 |
— |
|
8 |
Dielectric Loss (1 MHz) |
≤ 0.0004 |
— |
|
9 |
Metallization Layer |
Mo/Mn, 15–25 |
μm |
|
10 |
Plating Layer |
Ni / Cu / Au, typically 8–10 |
μm |
Note: Actual material properties and metallization specifications may vary depending on alumina grade, ceramic geometry, metallized area, plating system, and application requirements.
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Why the 7-Wave Corrugated Design?
The seven-wave profile is designed to provide a longer surface path between electrically separated areas than a flat ceramic structure of similar overall size.
This geometry can be useful in applications where:
- High-voltage insulation is required
- Available installation space is limited
- Increased creepage distance is beneficial
- Ceramic-to-metal brazing is required
- Vacuum-compatible structural insulation is needed
- Mechanical stability under thermal cycling is important
The exact wave profile, pitch, depth, and overall dimensions can be customized according to the electrical and mechanical design of the assembly.
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Key Features
Extended Creepage Path
The corrugated seven-wave geometry increases the effective surface distance across the ceramic, supporting insulation performance in high-voltage applications.
High Electrical Insulation
Alumina ceramic provides good dielectric strength and stable electrical properties for vacuum and high-voltage equipment.
Reliable Metallization Interface
Mo/Mn metallization provides a suitable metallic interface for subsequent plating, brazing, and ceramic-to-metal joining.
Good Brazing Compatibility
Nickel-plated metallized surfaces can be used with compatible brazing alloys and metal components such as Kovar, stainless steel, copper, and nickel-based alloys.
Thermal Stability
Alumina ceramics offer good dimensional stability and mechanical strength across demanding thermal environments.
Custom Metallization Areas
Metallization can be applied selectively to ceramic end faces or other specified areas according to assembly requirements.
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Typical Applications
Metallized 7-wave alumina ceramic components can be used in:
- Vacuum interrupters
- High-voltage switchgear
- Vacuum circuit breakers
- Vacuum contactors
- High-power vacuum devices
- Ceramic-to-metal sealed assemblies
- High-voltage feedthrough systems
- X-ray tube assemblies
- RF and microwave vacuum devices
- Industrial vacuum equipment
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Materials & Metallization
Ceramic Material
95% or 99% Alumina (Al₂O₃)
Structure
Seven-wave corrugated ceramic body
Base Metallization
Mo/Mn
Typical Metallization Thickness
15–25 μm
Optional Plating
Nickel (Ni), Copper (Cu), Gold (Au)
Typical Plating Thickness
8–10 μm
Metallized Areas
Customized according to customer drawings
Color
White ceramic with metallic coated areas
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Ceramic-to-Metal Brazing
The metallized ceramic surfaces are designed to provide a suitable interface for ceramic-to-metal brazing.
Typical metal combinations may include:
- Kovar
- Stainless steel
- Copper
- Nickel alloys
- Nickel-iron alloys
- Molybdenum
Compatible brazing systems may be selected according to operating temperature, coefficient of thermal expansion, vacuum requirements, mechanical loading, and the mating metal.
For demanding vacuum applications, the final brazed assembly should be evaluated according to the customer’s required hermeticity and leak-rate specifications.
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Custom Manufacturing
TecCera supports customized 7-wave metallized ceramic components based on customer drawings and technical requirements.
For evaluation and quotation, please provide:
- 2D or 3D drawing
- Alumina purity
- Overall diameter
- Overall length
- Wave quantity
- Wave pitch
- Wave depth
- Wall thickness
- Dimensional tolerances
- Metallization area
- Metallization thickness
- Plating material
- Plating thickness
- Mating metal
- Operating voltage
- Operating temperature
- Vacuum or leak-rate requirement
- Estimated quantity
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FAQ
Q1: Why is a corrugated ceramic structure used in high-voltage applications?
A: A corrugated ceramic surface increases the effective creepage path compared with a flat surface. This can help improve surface insulation performance while maintaining a relatively compact component size.
Q2: Can the seven-wave profile be customized?
A: Yes. The wave number, pitch, depth, diameter, wall thickness, overall length, and metallization areas can be customized according to customer drawings and application requirements.
Q3: What metallization system is typically used?
A: Mo/Mn metallization is commonly used as the base metallization system for alumina ceramic components. Nickel, copper, gold, or other compatible plating layers can be added depending on the brazing and application requirements.
Q4: Can the metallized ceramic be used for brazing?
A: Yes. Properly metallized and plated alumina ceramic surfaces can provide a suitable interface for ceramic-to-metal brazing. The brazing alloy and mating metal should be selected according to the operating conditions and assembly design.
Q5: Is this product only suitable for vacuum interrupters?
A: No. The corrugated metallized ceramic structure can also be considered for other high-voltage, vacuum, and ceramic-to-metal sealing applications where increased creepage distance and electrical insulation are required.
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Request a Quote
Looking for a custom metallized 7-wave alumina ceramic for vacuum interrupters or high-voltage vacuum equipment?
Send us your drawing, ceramic grade, dimensions, metallization requirements, plating specifications, operating conditions, and estimated quantity for technical evaluation and quotation.
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Meta Description
TecCera supplies custom metallized 7-wave alumina ceramics in 95% or 99% Al₂O₃ with Mo/Mn metallization and optional Ni, Cu or Au plating for vacuum interrupters and high-voltage applications.
Excerpt
Custom 7-wave metallized alumina ceramic components with Mo/Mn metallization for vacuum interrupters, high-voltage switching equipment and ceramic-to-metal brazing applications.
Technical Resources
Download the TecCera brochure for metallized alumina components, ceramic-to-metal brazed assemblies, hermetic seals, and vacuum feedthrough solutions.
Download Metallized Ceramics Brochure (PDF)How to Get a Quote
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