1 THERMOSTATIC BIMETALS, are temperature sensitive materials generally consisting of two layers of alloy strips having different coefficients of thermal expansion, bonded together into a composite strip. A flat strip of bimetal will assume a curvature on heating and upon cooling it will become flat again, so the effect is of reversible nature. The alloy having Lower coefficient of thermal Expansion (L.E.) becomes concave and alloy having Higher coefficient of thermal Expansion (H.E.) becomes convex upon heating. These alloys mainly consist of Nickel alloys e.g. Fe-Ni-Mn, Mn-Cu-Ni, Fe-Ni-Cr and Fe-Ni which are bonded into varying thickness ratios to obtain different grades. 2 SENSITIVITY is most important characteristic of a bimetal and it means "change of curvature with respect to temperature change" (also referred as Bending). Its value is intrinsic and mainly dependent on difference between coefficients of thermal expansions of H.E. and L.E. alloys.
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