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Application of a hydrogenation to production of the Nd sub 2 Fe sub 14 B permanent magnet

Journal Article:

Abstract

Powders of bulk ingot of Nd-Fe-B permanent magnet were prepared by a combination of hydrogenation and mechanical milling. In-situ observation revealed that cracks, during hydrogenation, were initiated at the grain bounderies where Nd-rich phases existed and then propagated into the matrix Nd{sub 2}Fe{sub 14}B phase. The powders were aligned and pressed in the hydrided condition and the green compacts were sintered at 1100 deg C for 1 hr, followed by heat treatment at 600 deg C for 1 hr. The maximum value of the (BH){sub max} of 37 MGOe was obtained with the sample which was planetary ball milled for 18 min after the hydrogenation at 13 atm. This value of (BH){sub max} is comparable with that of the magnets produced by mechanical milling only. (Author).
Authors:
Choi, Jeon; Park, Choong Nyeon; Choi, Dap Chun [1] 
  1. Chonnam National Univ., Kwangju (Republic of Korea)
Publication Date:
Dec 01, 1989
Product Type:
Journal Article
Reference Number:
AIX-22-022189; EDB-91-027806
Resource Relation:
Journal Name: Journal of the Korean Institute of Metals; (Republic of Korea); Journal Volume: 27:2
Subject:
36 MATERIALS SCIENCE; IRON BASE ALLOYS; HYDROGENATION; IRON BORIDES; NEODYMIUM ALLOYS; NEODYMIUM BORIDES; COERCIVE FORCE; GRAIN SIZE; MAGNETIC FIELDS; MAGNETIC PROPERTIES; PERMANENT MAGNETS; PRESSURE DEPENDENCE; SCANNING ELECTRON MICROSCOPY; ALLOYS; BORIDES; BORON COMPOUNDS; CHEMICAL REACTIONS; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; IRON ALLOYS; IRON COMPOUNDS; MAGNETS; MICROSCOPY; MICROSTRUCTURE; NEODYMIUM COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH ALLOYS; RARE EARTH COMPOUNDS; SIZE; TRANSITION ELEMENT COMPOUNDS; 360104* - Metals & Alloys- Physical Properties
OSTI ID:
6300221
Country of Origin:
Korea, Republic of
Language:
Korean
Other Identifying Numbers:
Journal ID: ISSN 0253-3847; CODEN: TKHCD
Submitting Site:
INIS
Size:
Pages: 1094-1103
Announcement Date:
Mar 01, 1991

Journal Article:

Citation Formats

Choi, Jeon, Park, Choong Nyeon, and Choi, Dap Chun. Application of a hydrogenation to production of the Nd sub 2 Fe sub 14 B permanent magnet. Korea, Republic of: N. p., 1989. Web.
Choi, Jeon, Park, Choong Nyeon, & Choi, Dap Chun. Application of a hydrogenation to production of the Nd sub 2 Fe sub 14 B permanent magnet. Korea, Republic of.
Choi, Jeon, Park, Choong Nyeon, and Choi, Dap Chun. 1989. "Application of a hydrogenation to production of the Nd sub 2 Fe sub 14 B permanent magnet." Korea, Republic of.
@misc{etde_6300221,
title = {Application of a hydrogenation to production of the Nd sub 2 Fe sub 14 B permanent magnet}
author = {Choi, Jeon, Park, Choong Nyeon, and Choi, Dap Chun}
abstractNote = {Powders of bulk ingot of Nd-Fe-B permanent magnet were prepared by a combination of hydrogenation and mechanical milling. In-situ observation revealed that cracks, during hydrogenation, were initiated at the grain bounderies where Nd-rich phases existed and then propagated into the matrix Nd{sub 2}Fe{sub 14}B phase. The powders were aligned and pressed in the hydrided condition and the green compacts were sintered at 1100 deg C for 1 hr, followed by heat treatment at 600 deg C for 1 hr. The maximum value of the (BH){sub max} of 37 MGOe was obtained with the sample which was planetary ball milled for 18 min after the hydrogenation at 13 atm. This value of (BH){sub max} is comparable with that of the magnets produced by mechanical milling only. (Author).}
journal = {Journal of the Korean Institute of Metals; (Republic of Korea)}
volume = {27:2}
journal type = {AC}
place = {Korea, Republic of}
year = {1989}
month = {Dec}
}