Kovar 4J29 ASTM F15 UNS K94610 Sealing Alloy
Kovar alloy is a iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties. Kovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials.
Specification
| ASTM | UNS | W.Nr |
| F15 | K94610 | 1.3981 |
Chemical composition
| Grade | % | Ni | Cr | Fe | Co | Cu | C | Mn | Si | P | S | Mo |
| Kovar | Min | 28.5 | Bal. | 16.8 | ||||||||
| Max | 29.5 | 0.2 | 17.8 | 0.20 | 0.03 | 0.50 | 0.30 | 0.02 | 0.02 | 0.20 |
Coefficient of linear expansion
| Grade | a/10-6·K-1 | ||
| Kovar | 200-300℃ | 20-400℃ | 20-450℃ |
| / | 4.6-5.2 | 5.1-5.5 | |
