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Kovar/UNS K94610

Short Description:

Kovar (UNS K94610), a nickel-iron-cobalt alloy containing approximately 29% nickel and 17% cobalt. Its thermal expansion characteristics match those of borosilicate glasses and alumina type ceramics. It is manufactured to a close chemistry range, yielding repeatable properties which make it eminently suitable for glass-to-metal seals in mass production applications, or where reliability is of paramount importance. The magnetic properties of Kovar are governed basically by its composition and by the heat treatment applied.


Product Detail

Product Tags

Chemical Composition

Alloy

element

C

Si

Mn

S

P

Ni

Fe

Co

Mo

Kovar

Min

 

 

 

 

 

28.5

 

16.8

 

Max

0.03

0.3

0.5

0.02

0.02

29.5

balance

17.8

0.2

Thermal Expansion

Aolly Status

Mean Linear Coefficient(10-6 /°C)

20~200

20~300

20~400

20~500

20~600

annealed

5.9

5.3

5.1

6.2

7.8

Physical Properties

Density g/cm3

Melting Point 

8.16

1450

Standard

Rod, Bar, Wire and Forging Stock - ASTM F15

Plate, Sheet and Strip - SAE AMS 7728


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