Constantan wire is a nickel-copper alloy, commonly known as CuNi45 or Cu55Ni45. The name Constantan is derived from the low change in resistance exhibited by this alloy even when subjected to varying temperatures. The wire is known for its excellent electrical resistivity, high thermal stability, and resistance to chemical corrosion.
With a composition of 55% copper and 45% nickel, Constantan wire is an ideal material for a range of applications. As an Oxford based company that has operated for over 30 years. (need remove brand name), we supply high-quality Constantan wires to the scientific research community across the globe.
Properties of Constantan Wire
Resistance
One of the most significant properties of Constantan wire is its resistance. This alloy has a relatively high resistance, making it an ideal choice for applications requiring high-resistance values. The resistance of this wire is almost constant, even when exposed to varying temperatures, hence the name Constantan.
Thermal Stability
Constantan wire has an exceptional level of thermal stability, making it suitable for use in high-temperature applications. The wire can withstand temperatures ranging between -40°C and 400°C, without any significant change in its electrical properties.
Corrosion-Resistance
Constantan wire is highly resistant to chemical corrosion. This resistance is attributed to the copper content in the alloy, which makes it highly resistant to alkaline solutions and reducing acids. The wire is also resistant to stress corrosion cracking, making it suitable for use in harsh environments.
Electrical Resistivity
The electrical resistivity of Constantan wire is relatively high compared to other conventional metals. This property makes it an ideal material for making resistors, strain gauges, and thermocouples. The wire's high electrical resistivity is due to the high percentage of nickel in the alloy.
Applications of Constantan Wire
Thermocouples
Constantan wire is commonly used to manufacture thermocouples. Thermocouples are devices that convert temperature variations into electrical signals. With the wire's high resistance and thermal stability, it is an ideal material for use in thermocouples.
Resistors
The high resistance of Constantan wire makes it an ideal material for use in resistors. Resistors are devices used to control the current flow in a circuit. Constantan wire is relatively cheap and easy to work with, making it a popular choice for resistor manufacturers.
Strain Gauges
Constantan wire is also used as the material for making strain gauges. Strain gauges are devices used to measure stress or strain in a material. The wire's high resistance and electrical properties make it suitable for use in such applications.
Conclusion
Constantan wire is a nickel-copper alloy with excellent electrical resistivity, high thermal stability, and resistance to chemical corrosion. This wire has a relatively high resistance and an almost constant value of resistance at varying temperatures. With applications ranging from thermocouples, resistors to strain gauges, Constantan wire is an ideal material for use in the scientific research community. Order Constantan wire resistance from (need remove brand name) today and get access to high-quality nickel-copper alloy ideal for your research needs.