ISSN 2594-5327
51th Congresso anual — Vol. 51 , num. 1 (1996)
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Abstract
It is a well known fact that coercivity may be increased by dopants. The main reason for this is the formation of new phases. In the present work, the effects of Cu on the microstructure of sintered magnets have been investigated using transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX). The Nd₁₇Fe₇₆.₅B₅Cu₁.₅ permanent magnets were prepared using the hydrogen decrepitation (HD) process. Thermomagnetic analysis showed that there was a ferromagnetic phase apart from the hard magnetic matrix phase in the sintered material. EDX microanalyses showed that this phase has a composition of ~95at% Fe, ~4.5at% Nd and ~0.5at% Cu, which is close to Nd₂Fe₁₇ phase. Two types of Cu containing phases were found in the intergranular regions besides the conventional Nd-rich phase.
It is a well known fact that coercivity may be increased by dopants. The main reason for this is the formation of new phases. In the present work, the effects of Cu on the microstructure of sintered magnets have been investigated using transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX). The Nd₁₇Fe₇₆.₅B₅Cu₁.₅ permanent magnets were prepared using the hydrogen decrepitation (HD) process. Thermomagnetic analysis showed that there was a ferromagnetic phase apart from the hard magnetic matrix phase in the sintered material. EDX microanalyses showed that this phase has a composition of ~95at% Fe, ~4.5at% Nd and ~0.5at% Cu, which is close to Nd₂Fe₁₇ phase. Two types of Cu containing phases were found in the intergranular regions besides the conventional Nd-rich phase.
Keywords
Permanent magnets, magnetic matenals, rare earth, Nd-Fe-B magnets.
Permanent magnets, magnetic matenals, rare earth, Nd-Fe-B magnets.
How to cite
Junior, Rubens Nunes de Faria; Lima, Luis Filipe Carvalho Pedroso de; Yin, XiJiang; Harris, Ivor Rex.
THE EFFECTS OF COPPER ON THE MICROSTRUCTURE OF SINTERED Nd-Fe-B TYPE MAGNETS,
p. 1449-1456.
In: 51th Congresso anual,
Porto Alegre, Brasil,
1996.
ISSN: 2594-5327, DOI 10.5151/2594-5327-51v2-425-432
