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Nichrome wire, when heated to red-hot temperatures, develops an outer layer of chromium oxide, [5] which is thermodynamically stable in air, is mostly impervious to oxygen, and protects the heating element from further oxidation. Nichrome alloys are known for their high mechanical strength and their high creep strength. [6]
As quoted in an online version of: David R. Lide (ed), CRC Handbook of Chemistry and Physics, 84th Edition.CRC Press. Boca Raton, Florida, 2003; Section 4, Properties of the Elements and Inorganic Compounds; Physical Properties of the Rare Earth Metals
Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures, up to 1,400 °C (2,550 °F). When used as a heating element, resistance wire is usually wound into coils.
30 silicon steel foils each of thickness 0.0172 inches (0.4368 mm); density 7.79 g cm −3; measured near a temperature of 358.2 K under pressure in the range 0 — 125 psi: 0 psi 0.496 w m −1 K −1 10 psi 0.748 22.5 psi 0.945 125 psi 1.65 100 psi 1.59 80 psi 1.54 47 psi 1.38 20 psi 1.14 0 psi 0.709 List: Taylor, T.S., Elec. World, 76 (24 ...
The effective temperature coefficient varies with temperature and purity level of the material. The 20 °C value is only an approximation when used at other temperatures. For example, the coefficient becomes lower at higher temperatures for copper, and the value 0.00427 is commonly specified at 0 °C. [53]
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When iron is added, the chromium nickel alloy becomes more ductile. The Nichrome and Chromel C are examples of an alloy containing iron. The composition typical of Nichrome is 60 Ni, 12 Cr, 26 Fe, 2 Mn and Chromel C, 64 Ni, 11 Cr, Fe 25. The melting temperature of these alloys are 1350 °C and 1390 °C, respectively. [11] [full citation needed]
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