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Kanthal (alloy)

Alloy of iron, chromium and aluminium used as resistance and heating wire

Kanthal (alloy)
Summary

Alloy of iron, chromium and aluminium used as resistance and heating wire

Kanthal is the trademark for a family of iron-chromium-aluminium (FeCrAl) alloys used in a wide range of resistance and high-temperature applications. Kanthal FeCrAl alloys consist of mainly iron, chromium (20–30 wt%) and aluminium (4–7.5 wt%). The first Kanthal FeCrAl alloy was developed by Hans von Kantzow in Hallstahammar, Sweden. The alloys are known for their ability to withstand high temperatures and having intermediate electric resistance. As such, it is frequently used in heating elements. The trademark Kanthal is owned by Alleima AB.

Characteristics

For heating, resistance wire must be stable in air when hot. Kanthal FeCrAl alloy forms a protective layer of aluminium oxide (alumina).{{Cite web |url-status=dead

Ordinary Kanthal FeCrAl alloy has a melting point of 1425 °C. Special grades can be used as high as 1500 °C.

Depending on specific composition the resistivity is about 1.4μΩ·m and temperature coefficient is +49ppm/K ().

Uses

Kanthal is used in heating elements due to its flexibility, durability and tensile strength. Its uses are widespread, for example in toasters, home and industrial heaters, kilns and diffusion heaters (used to make crystalline silicon).

In comparison to the other types of resistance wire used in vaping such as Nichrome, titanium-alloy and stainless steel, Kanthal is durable enough to withstand the temperatures required, but flexible and cheap enough to be practical for vaping purposes.

References

References

  1. "Electric heater for a [[semiconductor]] processing apparatus".
  2. "Kanthal heating technology products — Kanthal".
  3. Harlay, Jérôme. (2016-03-08). "A chemist's advice: Don't Dry-Burn your coil".
  4. misthub.com. (21 March 2016). "Tutorial: NiChrome vs Ni-200 vs Titanium vs Kanthal vs Stainless Steel {{!}} MistHub".
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

chromium-alloys ferrous-alloys refractory-metals swedish-inventions
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