Structure and magnetic properties of Nd-Fe-B fine particles produced by spark erosion
- Univ. of California, San Diego, La Jolla, CA (United States). Center for Magnetic Recording Research
Nd-Fe-B particles have been fabricated by spark erosion in different dielectric media, the best results have been obtained in liquid Ar, with the product consisting of crystalline 2:14:1 and amorphous Nd-Fe-B phases. The average particle size and volume percent of amorphous component are affected by power supply parameters, with higher discharge current pulses producing smaller average size and a higher ratio of amorphous component. Mixtures of soft and hard magnetic phases exists in as-made particles. The small particles (<5 {mu}m), which have the amorphous structure, are magnetically soft. To further obtain single domain particles of Nd{sub 2}Fe{sub 14}B, crystallization of submicron size particles is required. Since the crystallization temperature is about 600 C, it is crucial to prevent oxidation and sintering of such small particles during annealing. This latter work is in progress.
- OSTI ID:
- 69680
- Journal Information:
- Scripta Metallurgica et Materialia, Vol. 32, Issue 11; Other Information: PBD: 1 Jun 1995
- Country of Publication:
- United States
- Language:
- English
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