The microstructure and magnetic properties of NdFeB magnets directly solidified at a low cooling rate
✍ Scribed by Zongjun Tian; Shandong Li; Kun Peng; Benxi Gu; Jianrong Zhang; Mu Lu; Youwei Du
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 143 KB
- Volume
- 380
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
Nd 12.5 Fe 82 B 5.5 ribbons have been prepared by a melt spinning technique at a wheel speed ranging from 5 to 22 m/s. It was found that the wheel speed v R dramatically influences the microstructure and magnetic properties of the ribbons. At an optimized v R , a structure with single-phase Nd 2 Fe 14 B and an enhanced coupling between grains give rise to excellent magnetic properties. For example, the coercivity, remanence ratio, and maximum energy product of the best sample quenched at a wheel speed of 13 m/s are 1227.4 kA/m, 0.76, and 182.6 kJ/m 3 , respectively. In comparison with the samples from under-and over-quenched conditions and all the samples with annealing, the as-quenched sample fabricated at the optimized wheel speed has the best magnetic properties.