Nichrome

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Nichrome wire roll.

Nichrome, also known as nickel-chrome, chrome-nickel or just NiCr, is a type of nickel-chromium alloys, widely used in resistance wires, such as heating elements.

Composition

Nichrome typically consists of 80% nickel and 20% chromium, with traces of iron and other metals. This alloy is also known as NiCrA.

Another type of nichrome, NiCrC, consists of 61% Ni, 15% Cr, 24% Fe and has a melting point of 1350 °C, slightly lower that the latter mentioned.

Properties

Nichrome is a silvery-gray metal, relative soft. The standard alloy (Ni80Cr20) has a melting point of 1400 °C and a density of 8.4 g/cm3. It has an electric resistivity of (1.0—1.5) × 10−6 Ω·m at room temperature.

It is resistant to corrosion, mainly by forming a protective oxide layer. It is resistant to molten alkalis, however hot acids will slowly corrode it. Haloacids, like hydrochloric acid will corrode it in the presence of air.

Availability

Nichrome wiring can be found in most electric heating elements. It can also be bought from some hardware stores or online.

Nichrome wiring roll can also be purchased from various electronic cigarette stores.

Projects

  • Heating element
  • Make a tube furnace
  • Extract nickel and chromium

Handling

Safety

Nichrome poses little hazard to health as it is relative inert.

Storage

Nichrome does not require special storage. Store it as you wish.

Disposal

No special disposal is required, though you can recycle it.

References

Relevant Sciencemadness threads