Controlled Expansion Alloy (Buy Online from Stock)

Alloys with controlled expansion characteristics are used for a broad variety of applications where thermal size change of the metal must be considered in component part design. Generally, these alloys expand when heated and contract when cooled.

Composition and crystal structure, together, help determine the thermal expansion behavior of each alloy. The alloy expansion rate is commonly expressed in terms of an average or mean coefficient of thermal expansion.

The expansion behavior of some alloys is not linear. Therefore, it is important to specify the upper and lower temperature limits of interest when describing the expansion coefficient needed in any material.

There are three general types of controlled expansion alloys:

Low thermal expansion - these are predominantly iron-nickel alloys having very low expansion coefficients within certain temperature ranges. They are used generally in electronic devices, instrumentation and thermostats.

Matching expansion - these alloys possess approximately the same expansion coefficients as the glasses and ceramics commonly used in the electronics industry.

High thermal expansion - these are alloys which exhibit high expansion coefficients…higher, for example, than those for stainless steels and carbon steels. They are used primarily in thermostat applications.

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