KOVAR Nickel Alloy
KOVAR （4J29） is an iron-nickel-cobalt alloy belonging to the Kovar alloy series. Due to its thermal expansion coefficient close to that of hard glass (such as borosilicate glass), it can achieve high airtight sealing between glass and metal, and is a core material in fields such as electronic packaging and vacuum devices.
Chemical Composition
|
|
Ni |
C |
Si |
Mn |
P |
S |
Cu |
Cr |
Mo |
Co |
Fe |
|
Min |
28.5 |
- |
- |
- |
- |
- |
- |
19.5 |
- |
16.8 |
Rem |
|
Max |
29.5 |
0.03 |
0.3 |
0.5 |
0.02 |
0.02 |
0.2 |
20.5 |
0.2 |
17.8 |
Rem |
Material Properties
|
Density |
Melting Point |
Minimum Mechanical Properties of the Alloy at Room Temperature |
||
|
Tensile Strength |
Yield Strength |
Elongation |
||
|
g/cm3 |
℃ |
Rm N/mm2 |
Rp0.2 N/mm2 |
A5% |
|
8.2 |
1450 |
520 |
330 |
30 |
Standards
ASTM B511 ASTM B512
Feature
4J29 (Fe-Ni-Co glass sealing alloy): Matches thermal expansion of hard glass (-80~450°C) for hermetic sealing; high Curie point & low-temp stability
Applications
Glass-to-metal sealing for vacuum tubes, semiconductors, relays
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