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| Format: | Artículo científico |
| Language: | en |
| Published: |
Sociedad Mexicana de Física A.C.
2012
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| Subjects: | |
| Online Access: | https://www.redalyc.org/articulo.oa?id=57030392059 |
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Table of Contents:
- High temperature milling – new method of processing Nd-Fe-B powders W. Kaszuwara B. Michalski Física, Astronomía y Matemáticas Nd Fe B powders Mechanical milling High temperature milling The present paper describes a method of processing Nd-Fe-B powders, in which the milling operation is carried out, entirely or only in the final stage, at high temperatures, so that the destruction of the Nd2 Fe14 B phase and its recombination occur simultaneously. In this way a powder with good magnetic properties immediately after milling was obtained. In the present experiments, the Nd14 Fe80 B6 powder was subjected to high-energy milling for 17h (until the material becomes amorphous) and, then, the milling was continued for 0.5h with the powder container being heated to an appropriate temperature. Diffraction examinations have shown that the powder thus processed contains the Nd2 Fe14 B phase. Its magnetic properties appear to depend on the applied temperature. The best magnetic properties were achieved in the powder milled at a temperature between 520 and 540◦ C, but we found that even milling at a temperature of 455◦ C gave a material with a high coercivity. The powder milled at room temperature for 17h and then heated to 520◦ C in a separate furnace shows much worse magnetic properties than the powder subjected to heating at the same temperature but during the final stage of the milling. Therefore our experiments have proved that the milling and heating operations conducted simultaneously give better results than processes in which the two operations are performed separately. 2012 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57030392059 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.2 Vol.58