Alumel is an alloy consisting of approximately 95% nickel, 2% aluminium, 2% manganese, and 1% silicon. This magnetic alloy is used to make the negative conductors of ANSI Type K (chromel-alumel) thermocouples and thermocouple extension wire.[1] Alumel is a registered trademark of Concept Alloys, Inc.[2]

Properties of Alumel (95% Ni, 2% Al, 2% Mn, 1% Si)
Electrical resistivity 0.294 μΩ m
Temperature coefficient 23.9×10−4 K−1
Curie point 152 °C[3]
Density 8.61 g cm−3
Melting point 1399 °C
Tensile strength (annealed) 586 MPa
Tensile strength (stress relieved) 1030 MPa
Tensile strength (hard) 1170 MPa
Coefficient of thermal expansion 12×10−6K−1 at 20 °C
Specific heat 0.523 J g−1 K−1 [4]
Thermal conductivity 29.7 W m−1 K−1 [5]

References

  1. ↑ "Working with Chromel, Alumel & Constantan". Keats Manufacturing Co. 2015-03-12. Retrieved 2017-01-10.
  2. ↑ Concept Alloys, Inc. Intellectual Property retrieved 12 April 2016
  3. ↑ Horton, J. L.; Kollie, T. G.; Rubin, L. G. (1977). "Measurement of B versus H of Alumel from 25 to 180 °C". Journal of Applied Physics. 48 (11): 4666. Bibcode:1977JAP....48.4666H. doi:10.1063/1.323530.
  4. ↑ "Physical Properties of Thermoelement Materials" (PDF). Omega.com. Archived from the original (PDF) on 2017-07-24. Retrieved 2018-04-24.
  5. ↑ "Super Alloy Alumel". AZoM.com. 2012-11-09. Retrieved 2017-01-10.


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