Temperature stability and corrosion behavior of sintered Nd-Dy-Fe-Co-TM-B magnets, TM:V,Mo (abstract)

Journal Article · Fri Nov 15 04:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349833· OSTI ID:5125898

Adler, E; Rodewald, W; Wall, B ^[1]

---

1. Research and Development Department, Vacuumschmelze GmbH, P.O. 2253, D-6450 Hanau 1 (Germany)

By simultaneous additions of Co and V or of Co and Mo the temperature stability of sintered Nd-Fe-Al-B magnets can be improved.{sup 1--3} A partial substitution of Nd by Dy increases the coercivity by 1.4 kA/cm per wt. % Dy in the alloy, which results in strong coercivities at high temperatures. At 150 {degree}C, for instance, coercivities of about 9 kA/cm can be achieved. The magnetizing behavior is determined by nucleation of reversed domains. A complete magnetization requires a magnetizing field strength of about 25 kA/cm and does not depend on the coercive field strength. Although in Nd-Dy-Fe-Co-Mo-B magnets the Nd-rich Fe eutectic and the Nd{sub 1.1}Fe{sub 4}B{sub 4} boride are replaced by the Nd{sub 3}Co compound and the Mo{sub 2}FeB{sub 2} boride, respectively, the corrosion is similar to sintered Nd-Dy-Fe-B magnets. The corrosion rate at the 85 {degree}C--85% relative humidity test is much more determined by the surface treatment of the magnets.

• OSTI ID: 5125898
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 70:10; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
BORON ALLOYS
COBALT ADDITIONS
COBALT ALLOYS
COERCIVE FORCE
CORROSION RESISTANCE
DOMAIN STRUCTURE
IRON ALLOYS
MATERIALS
NEODYMIUM ALLOYS
NUCLEATION
RARE EARTH ALLOYS
SINTERED MATERIALS
STABILITY
VANADIUM ADDITIONS
VANADIUM ALLOYS