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美国通用汽车公司研制出一种新的永久磁铁,称为 Magnaquench 磁铁。其磁能积高达30兆高奥,而铁氧体磁铁,大约为4兆高奥。因而可以明显减少电机的体积和重量。如该磁铁用于 Delco Remy 起动电机中可取代传统的铜绕线圈,从而使其体积和重量比传统的起动电机要小45%左右。Magnaquench 磁铁是将成分大致为69.2%Fe,30%钕和0.8%硼的合金,靠无氧气氛中的一个旋转冷圆盘快速淬火制取;少量的硼显著改善了该合金磁性能。其性能还与细小颗粒的生成有关,因为每个细小颗
The United States General Motors has developed a new permanent magnet, known as the Magnaquench magnet. The energy product of up to 30 trillion high Austrian, and ferrite magnets, about 4 trillion high Austrian. This can significantly reduce the size and weight of the motor. If the magnet is used in Delco Remy starter motors to replace traditional copper windings, the magnets will be about 45% smaller and heavier than conventional starters. Magnaquench magnets are made by rapidly quenching an alloy of approximately 69.2% Fe, 30% Neodymium and 0.8% Boron by a rotating cold disc in an oxygen-free atmosphere; a small amount of Boron significantly improves the magnetic properties of the alloy. Its performance is also related to the formation of small particles, because each small particles