Kovar expansion alloy 4J29, K94610, 1.3981
Alloy K / K94610 / ASTM F15 Also known as Kovar®*** and Nilo K**, this alloy contains 29% nickel with a 17% cobalt addition. Its composition is tightly controlled within narrow limits to ensure precise and universal thermal expansion and mechanical characteristics. This helps the material provide high integrity glass-to-metal and ceramic-to-metal seals in applications requiring reliability and resistance to thermal shock. Alloy K is often used for the manufacture of hermetic seals with both the harder Pyrex or borosilicate glasses and alumina-type ceramic materials. It finds extensive application in the production of transistors and diodes for lids and closures in a variety of hybrid electronic circuit packages and also in the manufacture of microwave tubes.
Chemical Content request :
Element | 4J29 | K94610 | 1.3981 |
C | ≤0.03 | ≤0.04 | ≤0.05 |
Si | ≤0.30 | ≤0.20 | ≤0.30 |
Mn | ≤0.50 | ≤0.50 | ≤0.50 |
P | ≤0.020 | — | — |
S | ≤0.020 | — | — |
Ni | 28.5~29.5 | 29.0* | 28.0~30.0 |
Co | 16.8~17.8 | 17.0* | 16.0~18.0 |
Cr | ≤0.20 | ≤0.20 | — |
Cu | ≤0.20 | ≤0.20 | — |
Mo | ≤0.20 | ≤0.20 | — |
Al | — | ≤0.10 | — |
Mg | — | ≤0.10 | — |
Zr | — | ≤0.10 | — |
Ti | — | ≤0.10 | — |
Fe | Bal.* | Rest |
Brand:
USA | CARPENTER | Kovar®Rodar® |
Special Metals | Nilo® K | |
Franch | Aperam Alloys Imphy(Imphy Alloys) | Dilver P1® |
Germany | VDM Metals | Pernifer® 2918 |
Japan | NIPPON YAKIN | NAS 29CO |
Specifications
UNS K94610
Werkstoff Nr 1.3981
DIN 17745
ASTM F 15
AMS 7726 Wire
AMS 7727 Bars and Forgings
AMS 7728 Sheet, Strip and Plate
MIL-I-23011 class 1
AFNOR NF A54-301
S.E.W 385
DILVER P
KOVAR alloys achieve a tight mechanical connection between two materials over a range of temperatures, suitable for glass/ceramic-metal seals in scientific equipment, as well as conductors into glass envelopes for electronic components, such as vacuum tubes (valves), X-rays and Microwave tubes, transistors, diode integrated circuits, etc.