Copper resistance alloy is a precision resistance material mainly composed of copper and nickel, with low temperature coefficient of resistance, high stability, and corrosion resistance. It is widely used in precision resistors, strain elements, thermocouples, and other fields.
feature
Low temperature coefficient of resistance: Within the temperature range of 20 ± 10 ℃, the resistance value hardly changes with temperature, which is a key characteristic of standard resistance materials.
High thermoelectric potential: When paired with copper, the thermoelectric potential can reach about -45 microvolts/℃, making it an ideal material for manufacturing compensating wires for thermocouples and thermoelectric thermometers.
Good corrosion resistance and oxidation resistance: It can remain stable in air for a long time and is also resistant to corrosion in seawater and freshwater.
Mechanical and Process Performance
Mechanical properties: In the soft state, the tensile strength is about 400-500 megapascals, and the elongation can reach over 30%; In the hard state, the strength can be increased to over 700 megapascals.
Processing performance: It has good cold and hot processing performance and can be processed by hot forging, hot rolling, cold drawing, and cold rolling.
Welding performance: Good welding performance, can be connected by various methods such as brazing, resistance welding, etc.
Application field
Precision resistor components
AC circuit: Due to its low thermoelectric potential on copper, it is widely used in AC precision resistors, sliding resistors, and potentiometers to reduce thermoelectric interference.
Overload protection: As a fuse resistor, it can withstand momentary high current surges (such as in power input circuits), limit current through heating, and avoid component damage.
Thermocouples and compensation wires
Combined with copper or iron to form a thermocouple (such as a K-type thermocouple), measuring temperatures ranging from -200 ℃ to 1200 ℃.
Compensating wire materials can extend the transmission distance of thermocouple signals and reduce signal attenuation.
Strain Measurement and Industrial Control
Resistance strain gauges utilize the strain effect of copper foil to measure structural stresses (such as bridges and aircraft wing beams).
In electronic weighing instruments, the weight signal is converted through strain resistance, with an accuracy of 0.1%.