| Texto completo | |
| Autor(es): |
Elio Alberto Périgo
[1]
;
Edson Pereira Soares
[2]
;
Ricardo Mendes Leal Neto
[3]
;
Cláudio Costa Motta
[4]
;
Rubens Nunes de Faria Jr.
[5]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] CNEN. Instituto de Pesquisas Energéticas e Nucleares - Brasil
[2] CNEN. Instituto de Pesquisas Energéticas e Nucleares - Brasil
[3] CNEN. Instituto de Pesquisas Energéticas e Nucleares - Brasil
[4] Centro Tecnológico da Marinha em São Paulo - Brasil
[5] CNEN. Instituto de Pesquisas Energéticas e Nucleares - Brasil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 10, n. 3, p. 311-314, 2007-09-00. |
| Resumo | |
Sintered Pr16Fe76B8 magnets have been produced using the hydrogen decrepitation (HD) process and high-energy planetary ball milling. Investigations have been carried out to evaluate the influence of the milling speed and time. The best magnetic properties obtained were Br = (1020 ± 20) mT, µ0iHc = (1420 ± 30) mT and (BH)max/= (200 ± 4) kJm-3, for a magnet prepared with the alloy milled at 200 rpm for 4.5 ks. Magnets prepared from this powder exhibited a superior intrinsic coercivity compared to that of magnets produced using low-energy ball milling. However, the remanence and energy product of the latter were somewhat lower. An important feature was the dramatic reduction in the processing time (about 90%). Microstructural observation have shown that increasing the milling time and keeping constant the rotational mill speed caused an exponential grain size reduction in the sintered magnet. Increasing the milling speed also reduced the grain size and influenced both remanence and intrinsic coercivity. (AU) | |
| Processo FAPESP: | 05/04711-2 - Estudo das correlações entre microestrutura, propriedades magnéticas e fator de quadratura em ímãs sinterizados de PrFeB processados com hidrogênio |
| Beneficiário: | Élio Alberto Périgo |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |