Introduction
Kovar® is a registered trademark of Carpenter Technology Corporation. Chemistry By % Weight
|
C |
0.02% Max |
|
Co |
17% |
|
Fe |
Balance |
|
Mn |
0.3% |
|
Ni |
29% |
|
Si |
0.2% |
Typical Mechanical Properties
| Ultimate Tensile Strength |
|
75,000 PSI |
| Yield Strength |
|
50,000 PSI |
| Elongation @ Break |
|
30% |
| Modulus of Elasticity |
|
20,000 KSI |
| Poisson's Ratio |
|
0.317 |
Typical Physical Properties
| Density |
|
0.302 lbs/cu in |
| Melting Point |
|
1450° C |
| Electrical Resistivity @ RT |
|
4.9 Microhm-cm |
| Thermal Conductivity @ RT |
|
17.3 W/m-K |
Coefficient of Thermal Expansion
Linear at 20° C |
|
3.26 µin/in-°F |
| At 250° |
|
2.85 µin/in-°F |
| At 500° C |
|
3.42 µin/in-°F |
Kovar® is a vacuum melted Fe-Ni-Co low expansion alloy that has its
chemical composition controlled to tight tolerances assuring precise and
uniform thermal expansion properties. Kovar is commonly used for making
hermetic seals in hard glass. It has also found wide application in power
tubes, microwave tubes, diodes and transistors.
Forms
H Cross Company can provide Kovar in wire, ribbon, strip, sheet and foil
sizes to suit your particular needs. Please refer to our
Standard Dimension and Tolerances page for general size ranges of products. If you
do not see your required size list contact us via
email or phone for
further information or assistance.
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