Nichrome


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Nichrome

 

the general name of a group of heat-resistant alloys of nickel (65–80 percent) with chromium (15–30 percent).

Nichrome was first patented by A. Marsh in the USA in 1905. A large number of types of nichrome are produced in various countries; the nichrome is usually alloyed with silicon (up to 1.5 percent), aluminum (up to 3.5 percent), and traces of rare earths. Because of the combination of its great heat resistance in an oxidizing atmosphere (up to 1250°C) and high electrical resistance (1.05–1.40 microhm • m), nichrome is used as a material for heating elements of electrical furnaces and household appliances. In addition, nichrome alloys are used to make parts that operate at high temperatures under low stress, and sometimes also for making rheostats. Nichrome alloys containing more than 20 percent iron, which are often called ferronichromes, are widespread. They are cheaper than nichrome but are usually inferior to it in heat resistance.

Special types of complex nichrome alloys have been developed with low temperature coefficients of electrical resistance (∼ 10−5 per degree Celsius); they are used in making precision resistors. Nichrome is less resistant than chromal to deterioration at high temperatures but more resistant to loss of mechanical properties. Nichromes of types Kh20N80-N and KhN70Iu are produced in the USSR.

REFERENCE

Materialy ν mashinostroenii: Spravochnik, vol. 3. Moscow, 1968.

L. L. ZHUKOV

References in periodicals archive ?
The temperature limit for MgO is usually around 2000 F, so it can handle internal temperatures in the range of 1600 F typically generated by inner nichrome wire elements.
Koss et al., "A nichrome burn wire release mechanism for CubeSats," in The 41st Aerospace Mechanisms Symposium, Jet Propulsion Laboratory, pp.
The corrosion resistance of nichrome is excellent and its strength at high temperature is high.
Combustion of the sample was initiated with a nichrome filament.
Amateurs and retailers began making simple heater strips, taking nichrome wire (the kind used in electric toasters) and sewing it into a cloth band that can be wrapped around the end of a Schmidt-Cassegrain or refractor.
For the conductors, it was used mostly nichrome and iron wires and also a foreign-made immersion water heater with a stainless steel sheath (Weltor, Inc.).
coli from specimens of urine, stool, sputum and any other body fluid was done by culturing directly onto MacConkey agar plates (Oxoid, Basingstoke England), using sterile nichrome wire calibrated loop.
The stained antenna was taken through an ethanol series, air dried for a few minutes, and then glued by the scape with Cytoseal to a 1 cm length of nichrome wire.
The energy from the universal power supply turns into thermal energy in the heating wire (nichrome) at the distal end of the thermal welding probe and causes coagulation by simultaneous pressure that occurs as the probe is closed by the silicone boot at the other distal end [6, 7].
A new line of nichrome resistance wire coated with DuPont Teflon to create a nonstick surface for use at high temperatures has been introduced by APPLIED PLASTICS CO., INC.
Fireresistant nichrome wire would be wrapped around meticulously-worked and decorated clay to make disturbing and menacing objects like the Puff Adder.
M2 EQUITYBITES-April 7, 2011--CRISIL hikes ratings on Nichrome India's bank facilities(C)2011 M2 COMMUNICATIONS http://www.m2.com