Thermal bimetal is a kind of precision alloy, consists of two layers (or layers) with different thermal expansion coefficient of metal or alloy layer components as solid combination and into.A group of thermal bimetal yuan layer with low thermal expansion coefficient, the passive layer;Another group of yuan layer with high thermal expansion coefficient, to active layer.Sometimes, in order to obtain special properties of thermal bimetal, can also join the third or fourth layer metal or alloy.Usually, the passive layer are type invar alloy containing Ni34 ~ 50%;Active layer, the brass, Ni, Fe - Ni - Cr, Fe - Ni - Mn and Mn - Ni - Cu alloy, etc.Through different combination of active and passive layer material, you can get different kinds of thermal bimetal, such as high temperature, medium temperature, low temperature, high sensitive, corrosion resistant, resistance and quick action, etc.

application
Bimetallic strip: thermal bimetal is composed of two or more than two layers have different linear expansion coefficient of solid combination of alloy composite materials.Large expansion coefficient of the alloy layer is called the active layer, smaller expansion coefficient of the alloy layer is called the passive layer, between active and passive layer can be adjusted with the middle tier of the role of resistance, when the environment temperature changes, because the expansion coefficient of active and passive layer, bending or rotation.This alloy is used for temperature control, temperature compensation, current limit and temperature indicating temperature sensor in automatic control equipment and instrumentation.Can also be applied to the circuit breaker, switch, thermal relay, all kinds of temperature control components, home appliance protector, electronic protector, overload protector, condensate drain device, temperature controller, thermometer, incubator, meteorological instruments, electric iron, electric rice cooker, refrigerator, fire alarm, fluorescent lamp, oven, lighter, the starter current mode control switch automatically, automatic protection switching rules, etc.Also used for fluid (gas, liquid) valve temperature sensor in low voltage electrical switches, etc.

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