Electrical Resistance Alloy
Via using the inherent resistance of materials, the alloy is made into different of functional elements. It mainly contains Heating alloy, Precision resistance alloy, Strain resistance alloy and Thermistor alloy. With the development of the computer, missile, atomic energy and space navigation and other most advanced tech, it needs us to create better electronic instruments and electrical measuring instruments, and the precision resistance alloy is the key. At the same time, it pushes the scientists to follow the trend and create better precision resistance alloys.
Feature
At the temperature -60℃ or -100℃ to 300℃, it has low resistance temperature coefficient, and resistance temperature coefficient linear is good with the temperature.
High resistance; resistance rate is low based on year increasing.
It requires low thermoelectric potential of copper, especially used in the DC instrument.
Good processing ability, easy to be drawn to the wire with good mechanical property.
Good wear resistance and oxidation resistance, good coating performance.
Good weldability, easy brazing.
Since now, the alloys which can meet such requirements are not too much. Usually it has transition metals, nobel metals and rare metals, such as Cu-Mn, Ag-Mn, Au-Cr, Cu-Ni, Ni-Cr, Fe-Cr-Al and others.
Application
Electrical resistance alloy is mainly used in precision resistor, rheostat, heater. Resistance alloy for precision resistors has low working temperature, usually used in room temperature, like manganese copper and nichrome alloy; Resistance alloy for rheostat working temperature usually can’t be over 500℃, like cupro nickel and konstant; Resistance alloy for heater working temperature can be 1400℃, like heating alloy, precision resistance alloy, strain resistance alloy and thermistor alloy.
Heating alloy, mainly Ni-Cr and Fe-Cr-Al, such as 20Cr-80Ni, high electrical resistivity, used in heating elements in the furnaces.
Precision resistance alloy, mainly Cu-Mn, Cu-Ni, Ni-Cr and nobel metal alloy, with low coefficient of resistance temperature, used in precision resistor parts.
Strain resistance alloy, mainly Copper based, Nickel based, Iron based and precious metal alloy, like Konstant(Cu-Ni-Mn).
Thermistor alloy, mainly Cobal based, Nicekl based, Iron based alloy, like 50Ni-10Co-Fe.
