Used for glass-to-metal seals in applications,requiring high reliability or resistance to thermal shock.

Kovar / NILO K / Pernifer 2918 / Dilvar P1

Note:

A nickel-iron-cobalt controlled-expansion alloy containing 29% nickel. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Used for glass-to-metal seals in applications requiring high reliability or resistance to thermal shock. Examples are high-power transmitting valves, transistor leads and headers, integrated-circuit lead frames, and photography flash bulbs.

Chemistry By % Weight

C: 0.02% Max

Co: 17%

Fe: Balance

Mn: 0.3%

Ni: 29%

Si: 0.2%

Coefficient of Thermal Expansion (Nominal):

30°C - 200°C   5.5 (x 10-6 m/m · K)   30°C - 600°C     7.9   

30°C - 300°C   5.1                               30°C - 700°C     9.3

30°C - 400°C   4.9                               30°C - 800°C    10.4

30°C - 450°C   5.3                               30°C - 900°C    11.5

30°C - 500°C   6.2

Applications

Power tubes, microwave tubes, transistors, diodes, hybrid packages and other kinds of scientific instruments.

Available Product Forms: tube, strip and sheet, wire and round bar, etc.