Kovar 4J29
Kovar 4J29


Alloy

%

Ni

Cr

Fe

Co

Cu

C

Mn

Si

P

S

Mo

4J29

Min

28.5

Balance

16.8

Max.

29.5

0.2

17.8

0.2

0.03

0.5

0.3

0.02

0.02

0.2


The expansion coefficient of 4J29 alloy in a wide temperature range (-80-450℃) is similar to that of hard glass. In the electric vacuum industry, it is used to seal hard glass to make high-airtight components. It can also be used with hard glass. Ceramic sealing. Name: Fe-Ni-Co glass sealing alloy. At 20～450 ℃, it has a thermal expansion coefficient similar to that of borosilicate hard glass, a high Curie point, and good low-temperature structural stability. It is an iron-nickel-cobalt glass sealing alloy.


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