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Kovar 4J29 Nickel Alloy

The Kovar nickel alloy supplied by XINHUA has similar linear expansion coefficient with borosilicate (or Pyrex) over a range of temperatures (20℃~450℃), enabling it to be compatible with the thermal expansion characteristics of hard glass so as to achieve hermetic seals.

Oxidation film densification allows this iron-nickel-cobalt alloy to be readily welded and excellent plasticity makes it fabricable. Wide applications are power tubes, vacuum tubes, transmitting tubes, kinescopes, switch tubes, transistors, relay housing, etc.

4J29 F15 K94610 1.3981
Chemical Compositions of Kovar Nickel Alloy
Composition Ni Cr Fe Co Cu C Mn Si P S Mo
Content (%) Min. 28.5 Bal. 16.8
Max. 29.5 0.2 17.8 0.20 0.03 0.50 0.30 0.02 0.02 0.20
Coefficient of Linear Expansion
a/10-6·K-1 200-300℃ 20-400℃ 20-450℃
/ 4.6-5.2 5.1-5.5
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