4J29 Kovar Alloy Bar is also known as Kovar alloy. The alloy has a linear expansion coefficient similar to that of silicon boron hard glass at 20-450°C, a higher Curie point, and good low-temperature structural stability.
Similar grades:
29HК Kovar Nilo K KV-1 Dilver P0 Vacon 12
29HК-BИ Rodar KV-2
Techallony Glasseal 29-17 Telcaseal KV-3 Dilver P1 Silvar 48
Chemical composition:
C≤0.03%
Mn≤0.50%
Si≤0.30%
P≤0.020%
S≤0.020%
Cu≤0.20%
Cr≤0.20%
Mo≤0.20%
Ni=28.5~29.5%
Co=16.8~17.8%
Fe=rest
Grade : Kovar nickel-cobalt ferrous alloy/ 29HK/ 4J29
Classification : the alloy of expansion characteristics
Kovar Alloy Bar Application: Kovar (trademark of CRS Holdings, inc., Delaware[1]) is a nickel-cobalt ferrous alloy compositionally identical to Fernico 1, designed to be compatible with the thermal expansion characteristics of borosilicate glass (~5 × 10?6 /K between 30 and 200 °C, to ~10 × 10?6 /K at 800 °C) in order to allow direct mechanical connections over a range of temperatures. It finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some lightbulbs.
Kovar Alloy Bar Chemical Composition in % Kovar
Ni
28,5-29,5% |
Fe
51,14-54,5% |
C
0.03% |
Si
0.3% |
Mn
0,4 % |
S
o 0.015% |
P
0.015% |
o
17-18% |
Ti
0.1% |
Al
0.2% |
Cu
0.2% |
Cr
0,1 % |
Kovar Alloy Bar picture:
