Published 1988 | Version v1
Miscellaneous Metadata-only

Influence of heat treatments on magnetic properties of Nd-Fe-B sintered magnets

Creators

  • 1. Instituto de Pesquisas Tecnologicas, Sao Paulo, SP (Brazil). Div. de Metalurgia

Description

Anisotropic magnets of NdFeB were produced by powder metallurgy techniques, using magnetic field pressing followed by vaccum sintering at 10800C. We studied the influence of heat treatments on the magnetic properties. Two sequences were used: a) annealing treatment only b) a pre-anneal at 9000C followed by an anneal. Six annealing temperatures between 500 and 7500C were used. In addition to the magnetic properties, values of the density and microhardnes are presented. We show also the effect of pulsed magnetic fields and small cracks on the sample magnetization. (author)

Availability note (English)

Available from the Library of Comissao Nacional de Energia Nuclear, RJ, Brazil.

Abstract (Portuguese)

Imas anisotropicos Nd Fe B foram fabricados por metalurgia do po, com compactacao em presenca de campo magnetico seguida de sinterizacao sob vacuo a 10800C. Estudou-se a influencia de tratamentos termicos posteriores sobre as propriedades magneticas. Dois tipos de sequencia foram utilizados: a) apenas um revenimento e b) um pre-tratamento a 9000C, seguido de revenimento. Estudaram-se seis temperaturas de revenimento, entre 500 e 7500C. Alem das propriedades magneticas, apresentam-se valores de densidade e microdureza destas amostras. Apresentam-se tambem exemplos do efeito de aplicacao de campo pulsado na magnetizacao das amostras e do efeito de trincas geradas na compactacao. (autor)

Additional details

Additional titles

Original title (Portuguese)
Influencia de tratamentos termicos sobre as propriedades magneticas de imas sinterizados de Nd-Fe-B

Publishing Information

Imprint Pagination
4 p.

Conference

Title
8. Brazilian Congress on Engineering and Materials Science.
Dates
12-15 Dec 1988.
Place
Campinas, SP (Brazil).

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
20065515
Subject category
S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Conference, Non-conventional Literature
Descriptors DEI
BORON; CRACKS; IRON; MAGNETIC PROPERTIES; MAGNETS; MICROHARDNESS; NEODYMIUM; PRESSING; SINTERING; TEMPERATURE DEPENDENCE
Descriptors DEC
ELEMENTS; EQUIPMENT; FABRICATION; HARDNESS; MATERIALS WORKING; MECHANICAL PROPERTIES; METALS; PHYSICAL PROPERTIES; RARE EARTHS; SEMIMETALS; TRANSITION ELEMENTS