Metallized Ceramic Parts
Metallized Alumina Ceramic Rings for Brazed Assemblies
Mo Mn metallized and plated rings ready to braze to metal
Ceramic does not braze to metal on its own, so the joint has to be engineered into the part. These rings carry a molybdenum manganese metallized layer of 25 plus or minus 10 microns with a nickel plate of 2 to 10 microns, giving a brazeable surface with an average pin pull strength of 4200 kgf/cm2 measured on a 3.0 mm diameter pin. Silver, copper and gold plating are also available, and the ceramic body can be 95% or 96% alumina, AlN or BeO.
Key Benefits
- Mo Mn metallization at 25 plus or minus 10 microns gives a consistent brazeable surface
- Nickel plate of 2 to 10 microns protects the metallized layer before brazing
- Average pin pull strength of 4200 kgf/cm2 on a 3.0 mm pin
- Plating available in Ni, Cu, Au and Ag to suit your braze alloy
- Metallization and brazing can both be done here, so the joint is not split across two suppliers
Problems It Solves
- Hermetic joints leaking because the metallization thickness varies between lots
- Assemblies that cannot be sealed because the ceramic will not wet with braze alloy
- Split responsibility between a ceramic supplier and a brazing house when a joint fails
Who It Is For
- Designers of hermetic feedthroughs and sealed housings
- Power equipment makers requiring insulated brazed joints
- Buyers who want the metallized ceramic and the brazed sub-assembly from one source
Application Scenarios
Electrical transmission and distribution assemblies
Feedthroughs and sealed housings in the electronics industry
Solid oxide fuel cell assemblies
Automobile and textile machinery components requiring ceramic to metal joints
Technical Features
- Metallization layer Mo Mn, thickness 25 plus or minus 10 microns
- Nickel plating thickness 2 to 10 microns
- Pin pull strength 4200 kgf/cm2 average at 3.0 mm pin
- Available on 95% or 96% alumina, AlN substrate or BeO substrate
Manufacturing Process
Raw material preparation, forming, surface grinding, internal and external diameter grinding and precision CNC machining are all carried out in house.
Materials
- Alumina Al2O3, also AlN or BeO
- 95% or 96% alumina
Specifications
| Material | Alumina Al2O3, also AlN or BeO |
|---|---|
| Size | Custom |
| Colour | White with metal coating |
| Metallized layer | Mo/Mn |
| Plated layer | Ni, Cu, Au, Ag |
| Metallization thickness | 25 +/-10 um |
| Nickel thickness | 2-10 um |
| Pin pull strength | 4200 kgf/cm2 average at 3.0 mm pin |
| Ceramic composition | 95% or 96% alumina |
Figures are taken from the published product specification. Values not listed are marked TBC and confirmed against your drawing before quotation.
Quality Control
- Metallization and plating thickness checked against the 25 +/-10 um and 2-10 um windows
- Pull strength verified against the 4200 kgf/cm2 average figure
- Inspection report issued to your drawing on request
Certifications
No third party certification documents are published for this product. Every shipment is inspected to your drawing with an inspection report issued. Certification status is TBC and confirmed on request.
Customization Options
- Ring size and metallization pattern to your drawing
- Plating selected from Ni, Cu, Au or Ag to suit your braze alloy
- Metallization and brazing supplied as a finished sub-assembly
Comparison With Other Ceramics
Plain alumina is cheaper but cannot be brazed, so it suits clamped or bonded joints only. Metallized alumina is the choice whenever a hermetic or structural ceramic to metal joint is required, and AlN or BeO bodies are used where the joint also has to move heat.
Use Guide
- Tell us the braze alloy so the plating is matched to it
- Mark the metallized band position and width on the drawing, not just the ring dimensions
- Keep plated parts sealed until brazing; oxidised nickel wets poorly
Industries Using This Part
Related Solutions
Related Application Notes
Related Guides
Metallized Alumina Ceramic Ring FAQ
How thick is the metallization?
The Mo Mn metallization is 25 plus or minus 10 microns, with a nickel layer of 2 to 10 microns on top.
How strong is the metallized joint?
Pin pull strength averages 4200 kgf/cm2, measured on a 3.0 mm diameter pin.
Which platings are available?
Nickel, copper, gold and silver are available over the Mo Mn metallization.
Which ceramic bodies can be metallized?
95% and 96% alumina, AlN ceramic substrate and BeO ceramic substrate.
Can you braze the assembly as well?
Yes. Metallization and brazing are both possible here, in a wide range of sizes and shapes as requested.
Do you work to customer drawings?
Yes. Our main business is OEM and ODM. Please show us your drawing.
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