The influence of MgO/Mg and Al{sub 2}O{sub 3}/Al additives on coercivity, thermal stability, and microstructure of Nd-Fe-B magnets

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Materials Research Bulletin

DOI:https://doi.org/10.1016/0025-5408(96)00121-3· OSTI ID:415480

Yan, A; Chen, Z; Song, X; Wang, X ^[1]

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1. Xi`an Jiaotong Univ. (China). School of Materials Science and Engineering

The influence of MgO/Mg and Al{sub 2}O{sub 3}/Al addition on the coercivity, thermal stability, and microstructure of Nd{sub 22}Fe{sub 71}B{sub 7} magnets has been investigated. It has been found that (1) the coercivity is considerably enhanced by the addition of MgO, Al{sub 2}O{sub 3}, Mg, and Al; and (2) the thermal stability can be improved by the MgO, Al{sub 2}O{sub 3}, Mg, and Al additives, especially MgO and Al{sub 2}O{sub 3}. Microstructural studies reveal that two different intergranular phases appear in the oxide- and pure-element-doped magnets. The modification of the properties can be attributed to the appearance of the phases. It is further found that the introduction of an appropriate amounts of oxygen together with Mg or Al is beneficial for the coercivity and thermal stability of Nd-Fe-B magnets, and the alloying to the intergranular regions (the alloying elements are introduced into intergranular regions) may be a more effective approach to improve the properties of magnets.

• OSTI ID: 415480
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 10 Vol. 31; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM OXIDES
BORON ALLOYS
COERCIVE FORCE
COMPOSITE MATERIALS
DOPED MATERIALS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MAGNESIUM
MAGNESIUM OXIDES
MAGNETIC PROPERTIES
MICROSTRUCTURE
MILLING
NEODYMIUM ALLOYS
OPTICAL MICROSCOPY
POWDERS
SCANNING ELECTRON MICROSCOPY
SINTERING
X-RAY SPECTROSCOPY