Kovar


Also found in: Acronyms, Wikipedia.

kovar

[′kō‚vär]
(metallurgy)
An alloy (54% iron-29% nickel-17% cobalt) that exhibits low thermal expansion; widely used for electronic devices with glass-to-metal seals because its expansion is low enough to match that of glass.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Kovar

 

an iron-based alloy containing 18 percent cobalt and 29 percent nickel. Kovar is characterized by a low coefficient of thermal expansion [(4.5–5.2) X 10-6 1/°C between 20° and 400°C], approximating the coefficient of thermal expansion of glass. Melting point, 1450°C; specific electrical resistance, 0.5 microhm · m; Curie temperature, 420°C. The alloy corrodes in a moist medium and requires protective coatings. When sealed in glass, Kovar forms a strong vacuum-tight adhesion, which is used in electrical engineering for the manufacture of casings and current outlets in various tubes and devices.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

Kovar

An inert metal alloy that does not oxidize.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Both LTCC and LTCC-M start with a roll of "green tape" however LTCC-M bonds that tape to Kovar or CuMoCu.
Kovar says perusing the survey's list of benefits made him decide to increase the percentage the firm contributes to its employees' retirement plan "by a third."
Now there were five new hunters in camp -- Herman and Judy Kovar, good-natured Michigan bowman Aubrey Gale, Mary and myself.
Now, just a few months later, Kovar is training with the first team.
But Judy Kovar isn't one to give in easily to adversity.
The choice of Kovar for the main body of the connector, which houses the connector pins, sealed in glass, assures stress-free hermetic seals.
And Judy Kovar soon established a stellar reputation as a serious whitetail hunter.
Kovar, who was previously on trial at West Ham, trained under the watchful eye of academy boss Kieran McKenna.
Support was granted to assist Judy Kovar make her hunting-heritage lectures more accessible to school children in the Midwest.