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KOVAR* metal, due to its unique coefficient of expansion, has many applications where a metal must be joined to a ceramic or glass material.
English (United States)
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Annealing of Press Formed Kovar Article
KOVAR* metal, due to its unique coefficient of expansion, has many
applications where a metal must be joined to a ceramic or glass material.
An example of such an application is a metal flange element which is brazed
to a ceramic substrate of a semiconductor package. The flange is press-formed
to the particular shape desired. It is critical that the stresses in the flange,
induced by the pressing operation, be relieved by an annealing operation. If the
stresses are not relieved, there is a strong probability that the brazed weld to the
ceramic will not hold up.
This process provides a technique to relieve stresses in a press-formed
KOVAR article. Also, it provides a flattening operation to maintain tolerances
which are acceptable in KOVAR-to-ceramic applications and insures that the
article will retain its desired shape. Following the pressing operation, the article is
annealed in an inert atmosphere for about two hours, at a temperature of about
1250 Degrees F. The furnace is then allowed to cool down, with the article
therein, for about twenty-six hours. * Trademark of Westinghouse Electric