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Amorphous Alloy
Jun 06, 2018

An amorphous electrical steel sheet is a kind of soft magnetic material in which some liquid alloy (such as Fe-Si-B alloy) is directly cooled to a solid state at a cooling rate of millions of degrees Celsius per second to obtain an amorphous structure in the alloy. The main advantages are high magnetic induction and low iron loss (about 1/2 to 1/3 of the oriented silicon steel sheet).

In 1960, American P. Duwez invented the quenched metal process to make amorphous alloys. In 1968, GE's Luborsky found that amorphous alloys have a very low loss (10.44/W/kg). For this reason, in 1970, the American company Allied began production of amorphous alloy strips, which triggered the culmination of the study of amorphous alloys in the 1970s. In 1979, the single-roller amorphous belt method appeared, which promoted the industrialization of amorphous alloys. In 1979, Allied Corporation developed 260 5SC amorphous alloy (Fe81%, Bl1%, Si3%, C5%), and later developed a non-C 260 5S2 amorphous alloy (Fe78%, Bl3%, Si9 %). In the 1980s, the United States, Japan, and Germany successively established an annual production capacity of 10,000 tons of continuous belting equipment. The Soviet Union, Germany, the Czech Republic, and Hungary also built amorphous alloy industrial production equipment. China began researching amorphous alloys in 1976 and began producing amorphous alloys in the 1980s.

Amorphous alloy steel sheets have been used for punching transformer cores, three-phase motor stator cores, etc., and their core losses are much lower than non-oriented silicon steel cores.