Controlled Expansion Alloys

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Ed Fagan Inc. has a large inventory of Controlled Expansion Alloys for applications where metals must form a hermetic seal with glass or ceramic. In order to prevent the glass or ceramic from cracking, the thermal expansion characteristics of the alloy must closely match the thermal expansion characteristics of the glass or ceramic to prevent undue stress as the material expands and contracts as the assembly is heated and cooled.

Typical applications for hermetic seals include: vacuum tubes, lamps, power tubes, microwave tubes, transistors, switches and integrated circuits (Chips).

In addition, controlled expansion alloys are used where a specific expansion must be met over a certain temperature range. This often includes a minimum expansion requirement around ambient temperature. Invar 36 is often selected for this application. Controlled expansion alloys can be used in optoelectronics, optical and laser benches, precision instruments, measuring devices, and other scientific instruments.

Products include:

Invar (also known as Invar 36, NILO 36, Invar Steel and Pernifer 36)
Kovar (also known as ASTM F-15, NILO K, Pernifer 2918, Rodar, and Dilvar P1)
Alloy 42 (also known as Pernifer 42, NILO 42, and Glass-Seal 42)
Alloy 42-6 (also known as Glass-Seal 42-6)
Alloy 46 (also known as Pernifer 46, NILO 46, and Glass-Seal 46)
Alloy 48 (also known as Pernifer 48, NILO 48, and Glass-Seal 48), and Alloy 52 (also known as Pernifer 50, NILO 50, and Glass-Seal 52).

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