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Hot Forged Controlled Expansion Kovar Alloy , Round Bar Glass Sealing Alloy
| Place of Origin | China |
|---|---|
| Brand Name | XUNSHI |
| Certification | ISO9001:2015 |
| Model Number | Kovar |
| Minimum Order Quantity | 20kg |
| Price | Negotiable |
| Packaging Details | Wooden case |
| Delivery Time | 3-5 weeks |
| Payment Terms | T/T |
| Supply Ability | 1000kg per week |
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xProduct Details
| Material | Fe-Ni-Co | Forms | Strip, Bar, Wire, Pipe |
|---|---|---|---|
| Equal Grades | 4J29(China), ASTM F-15, NILO K, Pernifer 2918, Rodar, Dilvar P1, UNS K94610, 29-17 Alloy | Size Range | 20~300mm |
| Density | 8.36g/cm3 | Tc | 430°C |
| Highlight | iron nickel alloy,corrosion resistant alloys |
||
Product Description
Kovar Controlled Expansion Alloy Hot Forged Round Bar for Glass Sealing Application
A-ONE ALLOY keeps in stock Kovar hot fogerd round bar from diameter 20mm to diameter 300mm. And we could make fast delivery for customized sizes as well as forged pieces.
Kovar controlled expansion alloy, most likely know as 4J29 in China, is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron.
Kovar controlled expansion alloy, was invented to meet the need for a reliable glass-to-metal seal, which is required in electronic devices such as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum systems in chemistry and other scientific research area.
Kovar has thermal expansion similar to glass. Meanwhile its nonlinear thermal expansion curve can often be made to match a glass. This makes it the most popular controlled expansion alloy so far.
Chemical compostion of Kovar
| Alloy | % | Ni | Cr | Co | Cu | C | Mn | Si | P | S | Mo | Fe |
| Kovar | Min | 28.5 | 16.8 | Rem | ||||||||
| Max | 29.5 | 0.2 | 17.8 | 0.20 | 0.03 | 0.50 | 0.30 | 0.02 | 0.02 | 0.20 |
The average linear expansion coefficient(10-6C)
| 20~100°C | 20~300°C | 20~400°C | 20~450°C | 20~500°C | 20~530°C | 20~600°C |
| — | — | 4.6~5.2 | 5.1~5.5 | — | — | — |
Applications of Kovar
- Light bulbs
- Vacuum tubes
- Cathode ray tubes
- Power tubes
- Microwave tubes
- Transistoers
- Diodes
- Hybrid packages
- Other kinds of scientific instruments
Forms available at A-ONE ALLOY
- Bar
- Tube
- Strip
- Wire
- Plate
- Capillary
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