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Manufacture Nickel Karma/Evanohm Wire Precision Alloy Wire For Defrost Machine

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Manufacture Nickel Karma/Evanohm Precision Alloy Wire for Defrost machine
Karma and Evanohm wires are precision alloy wires renowned for their excellent electrical stability and low temperature coefficient of resistance. They maintain consistent resistance values across a wide temperature range, making them ideal for applications that demand high precision, such as resistors in electrical measuring instruments, aerospace electronics, and defrosting systems. These wires also offer good corrosion resistance and mechanical strength, ensuring long - term reliability and durability in various operating environments.


  • Product name: Karma/Evanohm Wire
  • Composition: Nicr
  • Feature: excellent electrical stability and low temperature coefficient of resistance
  • Application: For Defrost Machine
  • Sample: Support
  • Customization: Support
  • Product Detail

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    Product Description

    Manufacture Nickel Karma/Evanohm Precision Alloy Wire for Defrost machine

    1.   Evanohm alloy

    Evanohm alloy is made up of copper, nickel, Aluminum and Iron as the main components. The resistivity is 2~3 times higher than MENTONG. It has lower temperature coefficient of resistance(TCR), lower thermal EMF versus copper, good permanence of resistance for a long period of time and strong anti-oxidation. Its working temperature range is wider than MENTONG (-60~300ºC). It is suitable for making fine precision resistance elements and strain.

     2.  Evanohm size

    Wire: 0.018mm-10mm
    Ribbon: 0.05*0.2mm-2.0*6.0mm
    Strip: 0.5*5.0mm-5.0*250mm
    Bar: 10-100mm

    3.Evanohm  Property

      name  code                          Main Composition (%)  

    Standard

     

    Cr Al Fe Ni
    Evanohm  6J22 19~21 2.5~3.2 2.0~3.0  bal. JB/T 5328

     

    Name Code  (20ºC)
    Resisti

    vity
    (μΩ.m)

      (20ºC)
    Temp. Coeff.

    Of Resistance
    (αX10-6/ºC)

    (0~100ºC)
    Thermal

    EMF vs.

    Copper
    (μv/ºC)

    Max.workin

    g
    Temp.(ºC)

    (%)
    Elongati

    on

    (N/mm2)
    Tensile
    Strength
    Standard
    Evanohm 6J22 1.33±0.07 ≤±20 ≤2.5 ≤300 >7 ≥780 JB/T 5328

    4. Distinctive features of Evanohm resistance wire

    1) Starting with Nickel Chromium electric heat wire Class 1, we replaced some of the Ni with
    Al and other elements, and thus achieved a precision resistance material with improved
    resistance temperature coefficient and heat electromotive force against copper.
    With the addition of Al, we have succeeded in making volume resistivity 1.2 times greater
    than Nickel Chromium electric heat wire Class 1 and the tensile strength 1.3 times greater.

    2) The secondary temperature coefficient β of Karmalloy wire KMW is very small, - 0.03 × 10-6/ K2,

    and the resistance temperature curve turns out to be almost a straight line within a wide
    temperature range.

    Therefore, the temperature coefficient is set to be the average temperature coefficient between
    23 ~ 53 °C, but 1 × 10-6/K, the average temperature coefficient between 0 ~ 100 °C, also may
    be adopted for the temperature coefficient.

    3) Electromotive force against copper between 1 ~ 100 °C is also small, below + 2 μV/K, and

    exhibits excellent stability over a period of many years.

    4) If this is to be used as a precision resistance material, low temperature heat treatment is
    required to eliminate processing distortions just as in the case of Manganin wire CMW.


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