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Nichrome (also known as NiCr, nickel-chromium or chromium-nickel) is a family of alloys of nickel and chromium (and occasionally iron [1]) commonly used as resistance wire, heating elements in devices like toasters, electrical kettles and space heaters, in some dental restorations (fillings) and in a few other applications.
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.
When perfected, the new alloy was 300 times stronger than other types at that time. Chromel is made of 80% nickel and 20% chromium (though other ratios are used for special purpose nichrome applications). The US patent was granted February 1906, in Marsh's name, and later sold to Hoskins Manufacturing.
Nichrome 80/20 is one of the most commonly used resistance heating alloys because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time. Material beneath this layer will not oxidize, preventing the wire from breaking or burning out.
For amateur pyrotechnic use, electric matches can be built from scratch or from a kit. Kits include the thin wire needed for the bridgewire, such as nichrome wire, along with components for mixing the pyrogen. Scratch-built matches use thin wire which may be purchased or salvaged from sources such as light bulb filaments, and copper wiring. [1] [7]
Most modern electric heating devices use nichrome wire as the active element; the heating element, depicted on the right, uses nichrome wire supported by ceramic insulators. Alternatively, a heat pump can achieve around 150% – 600% efficiency for heating, or COP 1.5 - 6.0 Coefficient of performance , because it uses electric power only for ...
LAPD officials say Kia and Hyundai vehicles made between 2010 and 2021 are manufactured in a way that makes them more susceptible to hot-wire, a shortcoming that has been exploited and shared on ...
Usually a thin nichrome wire is used. Some applications also use platinum-silver alloy; other bridgewire materials in use are platinum, gold, silver, tungsten, etc. Care has to be taken when selecting the material as it is in direct contact with the pyrotechnic composition and should not undergo corrosion in such conditions.