Controlled Expansion

Controlled expansion alloys are iron-nickel alloys or iron-nickel-cobalt alloys used for applications in which thermal size change of the metal must be considered in the design. Composition and crystal structure help to determine each alloy’s thermal expansion behavior. The alloy expansion rate is most commonly stated in terms of an average coefficient of thermal expansion. Controlled expansion alloys were developed to demonstrate a coefficient of thermal expansion within certain ranges.

Invar 36

Ceramvar Alloy

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Super invar

Alloy 42& alloy 52

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kovar

Alloy 48

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