Abstract:
A composite thermostat metal having high electrical resistivity as required in certain thermostat metal applications is shown to have improved flexivity for increasing the useful work that can be performed with the composite material. The thermostat metal embodies a layer of an iron-chromium-aluminum-cobalt alloy which is sandwiched between and metallurgically bonded to a layer of a manganese-copper-nickel alloy and a layer of an iron-nickel alloy.
Abstract:
A THREE-LAYER COMPOSITE THERMOSTAT MATERIAL OF HIGH FLEXIVITY AND ELECTRICAL RESISTIVITY AND LOW COST IS SHOWN TO COMPRISE A LAYER OF METAL OF RELATIVELY HIGH COEFFICIENT OF THERMAL EXPANSION EMBODYING A CHROMIUM-NICKELIRON ALLOY AND A LAYER OF METAL OF RELATIVELY LOW COEFFICIENT OF THERMAL EXPANSION EMBODYING A NICKEL-IRON ALLOY, THESE METAL LAYERS BEING METALLCRIGICALLY BONDED TO OPPOSITE SIDES OF AN INTERMEDIATE METAL LAYER OF STAINLESS STEEL. THE RESISTIVITY, CORROSION RESISTANCE, STRENGTH, WORK-HARDENING PROPERTIES, AND ABILITY TO WITHSTAND HIGH TEMPERATURES OF THE INTERMEDIATE METAL LAYER COOPERATE WITH THE CORRESPONDING CHARACTERISTICS OF THE HIGH AND LOW EXPANSION MATERIALS BONDED THERETO TO PROVIDE AN ECONOMICAL, COMPOSITE THERMOSTAT MATERIAL HAVING A RESISTIVITY, FLEXIVITY, CORROSION RESISTANCE, USEFUL DEFLECTION TEMPERATURE RANGE, STRENGTH, AND ABILITY TO WITHSTAND HIGH TEMPERATURES COMPARABLE TO COMPOSITE THERMOSTAT MATERIALS PREVIOUSLY ACHIEVED ONLY AT SUBSTANTIALLY GREATER COST.
Abstract:
A composite thermostat metal material characterized by high electrical conductivity, improved resistance to deformation at elevated temperatures, and low cost embodies outer layers of relatively high and relatively low coefficients of thermal expansion respectively, and has an intermediate metal layer of a selected nickel alloy embodying a magnesium oxide constituent.