Abstract:
THERMOSTAT METALS WHICH HAVE HIGH FLEXIVITES ON THE ORDER OF AT LEAST ABOUT 13X10**-7 FOR DISPLAYING SUBSTANTIAL FLEXING MOVEMENT IN RESPONSE TO TEMPERATURE VARIATIONS WITHIN A SELECTED RANGE BUT WHICH ARE ADAPTED TO BE RESTRAINED AGAINST ADDITIONAL FLEXING MOVEMENT WHILE BEING SUBJECTED TO MUCH HIGHER TEMPERATURES WITHOUT TENDING TO BECOME PERMANENTLY DEFORMED ARE SHOWN TO COMPRISE THREE LAYERS OF METAL BONDED TOGETHER, TWO OF THESE METAL LAYERS HAVING RELATIVE THERMAL EXPANSION PROPERTIES, MODULI OF ELASTICITY AND THICKNESSES PROVIDING THE THERMOSTAT METALS WITH THE DESIRED HIGH FLEXIVITES AND THE THIRD LAYER, PREFERABLY OF HIGH STRENGTH STEEL DISPOSED BETWEEN THE TWO OTHER LAYETS, HAVING THERMAL EXPANSION PROPERTIES INTERMEDIATE THE THERMAL EXPANSION PROPERTIES OF THE TWO OTHER LAYERS, AND HAVING MUCH GREATER STRENGTH THAN THE MATERIALS OF EITHER OF TWO TWO OTHER LAYERS. THERMOSTAT METALS CONVENTIONALLY EMBODY METAL LAYERS OF SELECTED ALLOYS WHICH HAVE BEEN ESPECIALLY DEVELOPED TO DISPLAYED VERY HIGH AND VERY LOW COEFFICIENTS OF THERMAL EXPANSION. WHEN THESE METAL LAYERS ARE BONDED TOGETHER IN WORK-HARDENED CONDITION, THE RESULTING THERMOSTAT METALS HAVING HIGH FLEXIVITES AND DISPLAY A SUBSTANTIAL OF SELECTED ALLOYS WHICH HAVE BEEN ESPECIALLY DEVELOPED CHARGES. WHILE SUCH CONVENTIONAL THERMOSTAT METALS ARE WIDELY USEFUL, IT IS FOUND THAT IN SOME APPLICATIONS, WHERE THE THERMOSTAT METALS ARE ARRANGED TO DISPLAY SUBSTANTIAL FLEXING MOVEMENT IN RESPONSE TO TEMPERATURE VARIATIONS WITHIN A SELECTED TEMPERATURE RANGE BUT ARE RESTRAINED AGAINST ADDITIONAL FLEXING MOVEMENT WHILE BEING SUBJECTED TO RELATIVELY HIGHER TEMPERATURES, THE THERMOSTAT METALS TEND TO UNDERGO A CHANGE IN THERMAL RESPONSE CHARACTERISTICS DURING USE, THAT IS, IT IS FOUND THAT STRESSES DEVELOPED IN THE THERMOSTAT METALS WHEN THEY ARE HEATED TO HIGH TEMPERATURE WHILE RESTRAINED AGAINST FLEXING MOVEMENT TEND TO CAUSE A DEGREE OF PERMANENT DEFORMATION IN THE THERMOSTAT METALS.
Abstract:
AN IMPROVED MULTILAYER COMPOSITE THERMOSTAT MATERIAL IS DISCLOSED HAVING PREDETERMINED CHARACTERISTICS OF ELECTRICAL RESISTIVITY AND FLEXIVITY, INCLUDING FIRST AND SECOND OUTER LAYERS OF PRESELECTED METALLIC ALLOYS HAVING RELATIVELY HIGH AND RELATIVELY LOWER COEFFICIENTS OF THERMAL EXPANSION RESPECTIVELY, AND AN INTERMEDIATE LAYER OF A THIRD PRESELECTED METALLIC MATERIAL OF A SUBSTANTIALLY NICKEL-FREE, NON-FERROUS COPPER ALLOY. THE COMPOSITE MATERIAL MAY HAVE A RESISTIVITY OF BETWEEN APPROXIMATELY 100 OHMS PER
CIRCULAR MIL FOOT TO 400 OHMS PER CIRCULAR MIL FOOT AND A FLEXIVITY OF BETWEEN APPROXIMATELY 100X10**-7 TO 160X10**7 INCH PER INCH DEGREE FAHRENHEIT.
Abstract:
A support arrangement for the shadow mask in a color television tube of slim design is shown to include a plurality of support members formed of a low cost thermostat metal embodying only iron alloy materials, which thermostat metal displays high strength and corrosion resistance at elevated temperatures and displays low flexivity and stable thermal response properties, the thermostat metal having outer metal layers of approximately equal thickness formed of nickel-chromium-iron and nickel-iron alloys respectively and having an intermediate layer of selected stainless steel comprising between 45 and 65 percent of the total thickness of the thermostat metal providing the thermostat metal with a flexivity in the range from 90 to 110 in the temperature range from room temperature up to about 350*F.
Abstract:
A RELATIVELY LOW COST MULTILAYER COMPOSITE THERMOSTAT MATERIAL IS DISCLOSED HAVING PREDETERMINED CHARACTERISTICS OF ELECTRICAL RESISTIVITY AND FLEXIVITY, AND INCLUDING FIRST AND SECOND LAYERS OF PRESELECTED METALLIC ALLOYS HAVING RELATIVELY HIGH AND RELATIVELY LOWER COEFFICIENTS OF THERMAL EXPANSION RESPECTIVELY, AND AN INTERMEDIATE LAYER OF A SUBSTANTIALLY NICKEL-FREE METALLIC ALLOY HAVING A PRESELECTED THICKNESS RELATIVE TO THE TOTAL THICKNESS OF THE COMPOSITE MATERIAL SUCH THAT THE COMPOSITE MATERIAL HAS A RESISTIVITY OF BETWEEN APPROXIMATELY 625 TO 725 OHMS PER CIRCULAR MIL FOOT AND A FLEXIVITY OF BETWEEN APPROXIMATELY 200X10**7 TO 220X10**7 INCH PER INCH PER DEGREE FAHRENHEIT. IN THE DISCLOSED COMPOSITE, THE FIRST PRESELECTED METALLIC ALLOY COMPRISES A MATERIAL COMPRISING BY WEIGHT APPROXIMATELY 71% TO 76% MANGANESE, 9% TO 19% COPPER, AND 9% TO 17% NICKEL, WHILE THE SECOND PRESELECTED METALLIC ALLOY COMPRISES A METALLIC ALLOY SUCH AS THE MATERIAL COMMONLY REFERRED TO AS INVAR, WHICH COMPRISES BY WEIGHT APPROXIMATELY 35 1/2% TO 36 1/2% NICKEL AND THE BALANCE IRON. THE FIRST AND SECOND LAYERS ARE METALLURGICALLY BONDED TO RESPECTIVE OPPOSITE SURFACES OF THE INTERMEDIATE LAYER OF THE PRESELECTED FERROUS ALLOY TO DEFINE A COMPOSITE THERMOSTAT MATERIAL HAVING COMPARABLE CHARACTERISTICS TO PRESENTLY AVAILABLE THERMOSTAT MATERIAL, ONLY AVAILABLE AT SUBSTANTIALLY HIGHER COSTS.
Abstract:
A support arrangement for the shadow mask in a color television tube of slim design is shown to include a plurality of support members formed of a low cost thermostat metal embodying only iron alloy materials, which thermostat metal displays high strength and corrosion resistance at elevated temperatures and displays low flexivity and stable thermal response properties, the thermostat metal having outer metal layers of approximately equal thickness formed of nickel-chromium-iron and nickel-iron alloys respectively and having an intermediate layer of a selected stainless steel comprising between 45 and 65 percent of the total thickness of the thermostat metal providing the thermostat metal with a flexivity in the range from 90 to 110 in the temperature range from room temperature up to about 350*F.
Abstract:
A multilayer composite thermostat material is disclosed having predetermined characteristics of electrical resistivity and a substantially constant deformation resistance responsive to exposure to elevated temperatures over a predetermined temperature range. The composite includes a first outer layer of a first preselected metallic alloy having a relatively high coefficient of thermal expansion, a second outer layer of a second preselected metallic alloy having a relatively lower coefficient of thermal expansion, and an intermediate layer of a third preselected metallic, non-ferrous material having a resistivity of between approximately 10 ohms per circular mil foot to 30 ohms per circular mil foot and a substantially constant deformation resistance responsive to exposure to elevated temperatures up to approximately 500*C.
Abstract:
A method for making an edgelay thermostatic bimetal is disclosed in which two relatively long and thin strips of metal having the same coefficient of thermal expansion are continuously advanced into edgewise abutting engagement with respective lateral edges of a third, central strip of metal of widely different coefficient of thermal expansion. The pairs of abutting strip edges thus formed are then welded together substantially simultaneously as by tungsten inert gas shielded welding or the like. The simultaneous nature of the weld formation results in substantially uniform heating of all three of the strip materials at the weld location, thereby to avoid the excessive warping and twisting of the resulting, welded composite material which might otherwise occur due to the wide difference in coefficient of thermal expansion between the central strip material and the other strip materials. After cooling of the welded composite, the composite material is slit longitudinally through the central strip of metal to divide the composite into two substantially identical edgelay bimetals each embodying a strip element of relatively low coefficient of thermal expansion and a strip element of relatively high coefficient of thermal expansion. The disclosed apparatus includes means for advancing the three strips of metal in edgewise abutting relation to each other over the periphery of a large metal roll which has two circumferential grooves formed therein, the grooves being arranged to be aligned with pairs of abutting strip edges as the strips are advanced over the roll. A pair of welding means are disposed in closely spaced relation to each other to weld respective pairs of abutting strip edges together substantially simultaneously while the strip edges are positioned over the roll grooves, the large metal roll serving to rapidly conduct heat away from the strips as they are welded to minimize the width of the weld formed between each pair of the metal strips. In a preferred embodiment of the apparatus, additional rolls engage other surfaces of the metal strips being welded to conduct additional heat away from the strips for further reducing the widths of the welds formed between the strips.
Abstract:
A RELATIVELY LOW COST, MULTI-LAYER COMPOSITE THERMOSTAT MATERIAL IS DISCLOSED HAVING PRESELECTED ELECTRICAL RESISTIVITY AND FLEXIVITY CHARACTERISTICS INCLUDING FIRST AND SECOND OUTER LAYERS OF METALLIC ALLOYS HAVING RELATIVELY HIGH AN RELATIVELY LOWER COEFFICIENTS OF THERMAL EXPANSION AND AN INTERMEDIATE A LAYER OF A FERROUS ALLOY. THE FIRST OUTER LAYER OF METALLIC ALLOY COMPRISES A MATERIAL COMPRISING BY WEIGHT APPROXIMATELY 71% TO 76% MANGANESE, 9% TO 19% COPPER, AND 9% TO 17% NICKEL, WHILE THE SECOND OUTER LAYER COMPRISES A METALLIC ALLOY SUCH AS THE MATERIAL COMMONLY REFERRED TO AS INVAR, WHICH COMPRISES BY WEIGHT APPROXIMATELY 35 1/2% TO 36 1/2% NICKEL AND THE BALANCE IRON. THE FIRST AND SECOND OUTER LAYERS ARE METAL-
LURGICALLY BONDED TO RESPECTIVE OPPOSITE SURFACES OF THE FERROUS INTERMEDIATE LAYER. THE VARIOUS LAYERS COMPRISING THE COMPOSITE MATERIAL COOPERATE TO DEFINE AN EXTREMELY ECONOMICAL, COMPOSITE THERMOSTAT MATERIAL HAVING RE SISTIVITY CHARACTERISTICS SUITABLE FOR MANY APPLICATIONS, WHILE HAVING REQUISITE CHARACTERISTICS OF FLEXIVITY, USEFUL DEFLECTION TEMPERATURE RANGE, STRUCTURAL STRENGTH AND ABILITY TO WITHSTAND HIGH TEMPERATURES COMPARABLE TO PREVIOUSLY AVAILABLE THERMOSTAT MATERIALS ONLY OBTAINABLE AT SUBSTANTIALLY HIGHER COSTS.