Alumel

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Alumel is an alloy consisting of approximately 95% nickel, 2% aluminum, 2% manganese, and 1% silicon. This magnetic alloy is used for thermocouples and thermocouple extension wire. Alumel is a registered trademark of Concept Alloys, Inc.[1]

Physical Properties[edit]

  • Electrical resistivity: 0.294 μΩm
  • Thermal conductivity: 30 W/m/K
  • Curie point: 152 °C[2]
  • Density: 8.61 g/cm³ (0.311 lb/in³)
  • Melting point: 1399ºC (2550ºF)

Mechanical Properties[edit]

  • Tensile strength at break (annealed): 586 MPa (85000 psi)
  • Tensile strength at break (stress relieved): 1030 MPa (150000 psi)
  • Tensile strength at break (hard): 1170 MPa (170000 psi)

Thermal Properties[edit]

  • Thermal expansion co-efficient (@ 20ºC/68ºF): 12 µm/m°C (6.67 µin/in°F)
  • Thermal conductivity: 29.7 W/mK (206 BTU in/hr.ft².°F)[3]

In thermocouples, alumel is often used together with chromel to form type K thermocouples.[4]

References[edit]

  1. ^ Concept Alloys, Inc. Intellectual Property retrieved 12 April 2016
  2. ^ 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. 
  3. ^ "Super Alloy Alumel™". AZoM.com. 2012-11-09. Retrieved 2017-01-10. 
  4. ^ "Working with Chromel, Alumel & Constantan". Keats Manufacturing Co. 2015-03-12. Retrieved 2017-01-10. 

External links[edit]