Comparison of Stability of Manganese Copper Alloy Resistors and Copper Alloy Resistors at High Temperatures

Manganese copper alloy resistors and constantan alloy resistors both exhibit excellent stability at high temperatures, but each has its own characteristics. The following is a detailed analysis of the stability of these two alloy resistors at high temperatures:
High temperature stability of manganese copper alloy resistors

Electrical resistivity stability: Manganese copper alloy resistors have high electrical resistivity stability at high temperatures. Research has shown that within the temperature range of 200 ℃ to 400 ℃, the resistivity variation of manganese copper alloys typically remains within ± 5ppm/℃, demonstrating superior thermal stability.
Oxidation resistance: Manganese copper alloy also exhibits good oxidation resistance at high temperatures. Its surface can form an effective oxide film, reducing further oxidation of the material and thus extending the service life of the resistor in high-temperature environments.
Hardness and stability: The hardness of manganese copper alloy is related to its electrical resistivity. By appropriate heat treatment or cold processing, its hardness can be further improved while maintaining stable electrical resistance performance.

High temperature stability of copper alloy resistors

Resistance stability: Copper alloy resistance also exhibits good resistance stability under high temperature conditions. For example, in a high temperature environment of 800 ℃, the resistivity of constantan alloy can be maintained at around 1.10 Ω· m with a small range of variation, demonstrating its advantages in high-temperature applications.
Antioxidant performance: The chromium element in Kangtong alloy helps to form a dense Cr2O3 oxide film, significantly improving its antioxidant performance. In a high temperature environment of 1000 ℃, the oxidation rate of constantan alloy is still relatively low, further proving its stability in high temperature environments.
Thermal expansion coefficient: Copper alloy has a relatively low thermal expansion coefficient, which means that its size changes less when the temperature changes sharply, ensuring the dimensional stability of the resistor at high temperatures and reducing stress damage caused by thermal cycling.

summary
Manganese copper alloy resistors and constantan alloy resistors exhibit good stability at high temperatures. Manganese copper alloy resistors are known for their superior resistivity stability and oxidation resistance, making them particularly suitable for high-temperature applications that require high precision and long-term stability. Copper alloy resistors, on the other hand, have excellent performance in high-temperature environments due to their wide range of resistance values, good resistance temperature stability, and oxidation resistance. When choosing, the advantages and disadvantages of these two alloy resistors should be weighed based on specific application scenarios and requirements to select the most suitable resistor type.