Kovar

The Kovar® (Registered trademark) is a Alliage Fe Nor Co with low coefficient of thermal Dilatation.

It is used for sealing ( sealing in English) Verre/Métal or Céramique /m stall in a broad beach of Température and for multiple applications. Indeed, it presents a thermal dilation coefficient ( Coefficient off Thermal Expansion or CTE) close to those of hard glasses like the Verre borosilicate.

Kovar is derived from a more known alloy : the Invar®. This last is an iron alloy with nickel 36% which has a stability remarkable length since its dilation is almost null at the temperatures close to the Room temperature.

Composition

Typical composition (% in mass): 29 Nickel, 17 Cobalt, 0,3 Manganese, 0,2 Silica ( silicon in English), 0,02 maximum Carbon and the complement in Iron (approximately 53,5).

Applications

It serves in devices electronic S or Optique S containing of glass or ceramics, such as:

electron tubes, cathodic, with x-rays and Microwave;
lamps incandescent;
Transistor S, Diode S and integrated circuits;
Amplifying optics and supports of optics of Telescope S embarked in Satellite S.

Features

Commercial names: Dilver P®, K Rodar®, Nicoseal®, Nicosel®, Nilo®, Telcoseal 1®.

The Entreprise Imphy Alloys produces this type of alloy on the site close to Nevers, France. It currently forms part of the iron and steel group ArcelorMittal.

See too

External bonds

Imphy Alloys, a producer of alloys FeNiCo
Description of Kovar