Solution
Ceramic to Metal Metallizing and Brazing
Brazing a ceramic to a metal flange is not a brazing problem, it is a metallizing problem. When the joint leaks, the cause is almost always the metallized layer rather than the alloy. Here is how the joint is built and controlled.
The Route From Enquiry to Delivery
1. Joint Design
The metallized band position and width are defined on the drawing, alongside the ceramic dimensions, because the band is what actually carries the joint.
2. Body Choice
95% or 96% alumina for general work, AlN or BeO substrates where the joint also has to move heat.
3. Mo Mn Metallizing
A molybdenum manganese layer is applied at 25 plus or minus 10 microns and fired onto the ceramic surface.
4. Plating
Nickel at 2 to 10 microns as standard, with copper, gold or silver available to suit your braze alloy.
5. Brazing
Metallization and brazing are both available here, so the joint is not split between two suppliers.
6. Verification
Pin pull strength averages 4200 kgf/cm2 measured on a 3.0 mm diameter pin, and layer thickness is checked against the specified windows.
Samples
Samples are free of charge, freight paid by the buyer. Sample delivery is 4 to 7 working days.
Production Lead Time
15 to 30 days for goods not in stock, according to dimension and quantity.
Payment Terms
Orders up to 1000 USD are 100% in advance. From 1000 USD, 50% T/T in advance with the balance before shipment.
Products Delivered Through This Route
Metallized Ceramic PartsMetallized Alumina Ceramic RingMo Mn metallized and plated rings ready to braze to metalView specifications
Al2O3 Alumina Ceramic PartsAl2O3 Alumina Ceramic SubstratesHeat spreading insulating plates from 0.1 mm thickness with laser scribingView specifications
Al2O3 Alumina Ceramic Parts99% Al2O3 Alumina Ceramic Sheet Blank PlateSingle piece minimum order for wear plates and insulating blanksView specifications
Al2O3 Alumina Ceramic PartsRefractory Alumina Ceramic TubeWork tubes thermocouple sheaths and element supports to 1650 degrees CView specificationsRelated Application Notes
Ceramic to Metal Metallizing and Brazing FAQ
Why will my ceramic not wet with braze alloy?
Bare ceramic does not wet. It needs a fired Mo Mn metallized layer with a plated finish before any braze alloy is applied.
What pull strength does the joint reach?
An average of 4200 kgf/cm2 measured on a 3.0 mm diameter pin.
Can you supply the finished brazed assembly?
Yes. Metallization and brazing are both possible across a wide range of sizes and shapes.
Start With a Drawing
WhatsApp or email is the whole intake process. There is no form to fill in and no account to create.
Send a 2D or 3D drawing by WhatsApp or email. Samples in 4 to 7 working days.