New corrosion resistant materials based on neodym-iron-boron

Author

Grieb, B.

Author_Institution

Magnetfabrik Schramberg GmbH & Co., Germany

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3904

Lastpage

3906

Abstract

The properties of neodymium-iron-boron sintered magnets are optimised to attain high temperature stability and excellent corrosion resistance without coating or surface treatment. By the addition of elements to form intermetallic phases the intergranular region of this new material consists mainly of intermetallic phases and the corrosible Nd-rich phase is avoided as far as possible. Same additives which guarantee excellent corrosion properties comparable to SmCo permanent magnets are used to get better temperature coefficients of the remanence and the coercivity. A reduction of the temperature influence by 20 to 30% is achieved. Magnetic properties can be adjusted for the operation temperatures. By variation of the chemical composition high temperature applications up to 250°C can be accommodated

Keywords

boron alloys; coercive force; corrosion; ferromagnetic materials; iron alloys; neodymium alloys; permanent magnets; remanence; Nd-Fe-B; Nd-Fe-B sintered magnets; chemical composition; coercivity; corrosible Nd-rich phase; corrosion resistance; corrosion resistant materials; high temperature applications; high temperature stability; intergranular region; intermetallic phases; magnetic properties; operation temperatures; remanence; temperature coefficients; Coatings; Corrosion; Intermetallic; Magnetic materials; Magnetic properties; Magnets; Stability; Surface resistance; Surface treatment; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619610

Filename

619610