Resistor having a resistor element comprising resistance alloy with improved properties

Abstract

The invention relates to a resistor alloy ( 3 ) for an electrical resistor, in particular for a low-resistance current-measuring resistor, having a copper constituent, a manganese constituent and a nickel constituent. According to the invention, the manganese constituent has a mass fraction of 23% to 28%, while the nickel constituent has a mass fraction of 9% to 13%. The mass fractions of the alloy constituents are adjusted to one another in such a manner that, compared to copper, the resistor alloy ( 3 ) has a low thermal electromotive force at 20° C. of less than ±1μν/K. The invention furthermore includes a component made from such a resistor alloy and a production method therefor.

What is claimed is: 
     
         1 . A resistor comprising a resistor element, wherein the resistor element comprises a resistance alloy comprising:
 a) a copper constituent,   b) a manganese constituent,   c) a nickel constituent,   d) a tin constituent for improving a temperature stability of a specific electrical resistance of the resistance alloy, wherein mass fractions of the manganese constituent and of the nickel constituent are effective to provide the resistance alloy with a low thermal electromotive force against copper at 20° C. of less than +1 μV/K and more than −1 μV/K, a mass fraction of the nickel constituent is 9%-13%, a mass fraction of the manganese constituent is 23%-28%, a mass fraction of the tin constituent is up to 1% and a mass fraction of the copper constituent is 58%-68%.   
     
     
         2 . The resistor according to  claim 1 , wherein the resistor element is arranged between two plate-like connecting parts comprising copper. 
     
     
         3 . The resistor according to  claim 1 , wherein the resistance alloy further comprises a silicon constituent with a mass fraction of up to 1% for improving a temperature stability of a specific electrical resistance of the resistance alloy. 
     
     
         4 . The resistor according to  claim 1 , wherein the resistance alloy further comprises a magnesium constituent with a mass fraction of up to 0.3% for avoiding embrittlement as a result of precipitation hardening effects. 
     
     
         5 . The resistor according to  claim 1 , wherein the resistance alloy has a specific electrical resistance which is greater than 0.5 (Ω·mm 2 )/m and less than 2.0 (Ω·mm 2 )/m. 
     
     
         6 . The resistor according to  claim 1 , wherein the resistance alloy has a specific electrical resistance having a high stability over time with a relative change of less than ±0.5% within a period of 3000 hours. 
     
     
         7 . The resistor according to  claim 1 , wherein the low thermal electromotive force against copper at 20° C. possessed by the resistance alloy is less than +0.5 μV/K and more than −0.5 μV/K. 
     
     
         8 . The resistor according to  claim 1 , wherein the resistance alloy has a specific electrical resistance having a low temperature coefficient of less than +50·10 −6  K −1  and more than −50·10 −6  K −1  in a temperature range of from +20° C. to +60° C. 
     
     
         9 . The resistor according to  claim 1 , wherein the resistance alloy has a resistance/temperature curve which shows relative resistance change in dependence on temperature, the resistance/temperature curve having a second zero-crossing which occurs at a temperature of more than +20° C. and at less than +110° C. 
     
     
         10 . The resistor according to  claim 1 , wherein the resistance alloy has:
 a) a mechanical tensile strength of at least 500 MPa, and   b) a yield strength of at least 150 MPa, and   c) a breaking elongation of at least 30%.   
     
     
         11 . The resistor according to  claim 1 , wherein the resistor element is a wire, a ribbon, a sheet, a rod, a tube or a foil. 
     
     
         12 . The resistor according to  claim 3 , wherein the resistance alloy further comprises a magnesium constituent with a mass fraction of up to 0.3% for avoiding embrittlement as a result of precipitation hardening effects. 
     
     
         13 . The resistor according to  claim 12 , wherein the resistance alloy has a specific electrical resistance which is greater than 0.5 (Ω·mm 2 )/m and less than 2.0 (Ω·mm 2 )/m. 
     
     
         14 . The resistor according to  claim 13 , wherein the resistance alloy has a specific electrical resistance having a high stability over time with a relative change of less than ±0.5% within a period of 3000 hours. 
     
     
         15 . The resistor according to  claim 14 , wherein the low thermal electromotive force against copper at 20° C. possessed by the resistance alloy is less than +0.5 μV/K and more than −0.5 μV/K. 
     
     
         16 . The resistor according to  claim 15 , wherein the resistance alloy has a specific electrical resistance having a low temperature coefficient of less than +50·10 −6  K −1  and more than −50·10 −6  K −1  in a temperature range of from +20° C. to +60° C. 
     
     
         17 . The resistor according to  claim 16 , wherein the resistance alloy has a resistance/temperature curve which shows relative resistance change in dependence on temperature, the resistance/temperature curve having a second zero-crossing which occurs at a temperature of more than +20° C. and at less than +110° C. 
     
     
         18 . The resistor according to  claim 17 , wherein the resistance alloy has:
 a) a mechanical tensile strength of at least 500 MPa, and   b) a yield strength of at least 150 MPa, and   c) a breaking elongation of at least 30%.   
     
     
         19 . The resistor according to  claim 18 , wherein the resistor element is a wire, a ribbon, a sheet, a rod, a tube or a foil. 
     
     
         20 . The resistor according to  claim 19 , wherein the resistor element is arranged between two plate-like connecting parts comprising copper.