Kovar Wire for Glass Vacuum
Relative Grade:
29H Kovar Nilo K KV-1 Dilver P0 Vacon 1229H-B Rodar Telcaseal KV-2 Dilver P1 Silvar 48
Specification: Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube
Description
Kovar is a nominal 29%Ni-17%Co-54%Fe alloy that is a well-known glass-sealing alloy suitable for sealing to hard glasses. Kovar has a nominal expansion coefficient of approximately 5 ppm/°C and inflection temperature of ~450 °C (840 °F).
Kovar (ASTM F15) has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide application in power tubes, microwave tubes, transistors, and diodes. In integrated circuits, it has been used for the flat pack and the dual-in-line package.
Chemical Composition
| Grade |
C% |
P% |
S% |
Mn% |
Si% |
|
Cu% |
Cr% |
Mo% |
Ni% |
Co% |
Fe% |
| Kovar |
Max 0.03 |
Max 0.020 |
Max 0.020 |
Max 0.50 |
Max 0.30 |
|
Max 0.20 |
Max 0.20 |
Max 0.20 |
28.5-29.5 |
16.8-17.8 |
Bal. |
Specifications
| Grade |
UNS |
Werkstoff Nr. |
ASTM |
| Kovar |
K94610 |
1.3981 |
F15 |
|
Physical Properties
| Grade |
Density |
Melting Point |
| Kovar |
8.17 g/cm3 |
1449°C |
Mechanical Properties
| Grade |
Tensile Strength N/mm² |
| Soft |
1/4 Hard |
1/2 Hard |
3/4 Hard |
Full Hard |
| Kovar Strip |
<570 |
520-630 |
590-700 |
600-770 |
>700 |
| Kovar Wire |
<585 |
585-725 |
655-795 |
725-860 |
>860 |
Coefficient of Expansion
| Alloy |
Linear Coefficient of Thermal Expansion ā,10-6/ºC |
| 20-200ºC |
20-300ºC |
20-400ºC |
20-450ºC |
20-500ºC |
20-600ºC |
20-700ºC |
20-800ºC |
| Kovar |
5.9 |
5.3 |
5.1 |
5.3 |
6.2 |
7.8 |
9.2 |
10.2 |
Size Range
Kovar Wire: ¢0.1mm-¢9mm
Kovar Bar: ¢11mm-¢200mm
Kovar Strip: 75-110mm*0.15-22mm
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