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FeNiCo Controlled Expansion Alloys 4J29 For Vacuum Electronic Devices Glass Sealing
4J29 is an equal grade of Kovar controlled expansion alloy in China. It has a high Curie point and good low temperature tissue stability
Chemical compistion of 4J29
| Element | C | Mn | Si | P | S | Cu | Cr | Mo | Ni | Co | Fe |
| Weight(%) | 0.03 max | 0.5 max | 0.30 max | 0.020 max | 0.020 max | 0.20 max | 0.20 max | 0.20 max | 28.5~29.5 | 16.8~17.8 | Bal |
Features
Applications
Kovar is widely used in applications such as power tubes, microwave
tubes, transistors, diodes, hybrid packages, and other kinds of
scientific instruments.
