Kovar (Kovar)
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Basic Properties
| Alloy Type | |
|---|---|
| Designation | Kovar |
| Density | 8.36 g/cm³ |
| Melting Point | 1450°C |
Composition
| Element | Percentage |
|---|
Description
Iron-nickel-cobalt alloy with thermal expansion matching glass for glass-to-metal seals.
| Density | 8.36 g/cm³ |
|---|---|
| Electrical Resistivity | 49 μΩ·cm |
| Tensile Strength | 515-620 MPa |
|---|---|
| Yield Strength | 275-380 MPa |
| Elongation | 25-35% |
| Hardness | 160-200 HB |
| Machinability | Good - machines well with standard cutting tools |
| Melting Point | 1450°C |
|---|---|
| Thermal Conductivity | 17 W/(m·K) |
| Thermal Expansion | 5.9 μm/(m·K) |
| Heat Treatment | Stress relief at 480°C, hydrogen annealing for best properties |
| Heat Treatment | Stress relief at 480°C, hydrogen annealing for best properties |
|---|---|
| Corrosion Resistance | Fair - requires protection from corrosion in harsh environments |
Applications
Glass-to-metal seals, electronic components, vacuum tubes, hermetic packages, feedthroughs
History
Developed for electronics industry requiring reliable glass-to-metal seals.