Production method of rare earth magnet

US9520230B2 · kind B2 · utility

Assignees

• TOYOTA JIDOSHA KABUSHIKI KAISHA · JP
• CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE · FR
• LEIBNIZ INSTITUTE FOR SOLID STATE AND MATERIALS RESEARCH DRESDEN · DE
• The University of Sheffield · GB

Inventors

• Noritsugu Sakuma · Mishima, JP
• Hidefumi Kishimoto · Susono, JP
• Akira Kato · Yokohama, JP
• Tetsuya Shoji · Toyota, JP
• Dominique Givord · Grenoble, FR
• Nora Dempsey · Grenoble, FR
• Thomas George Woodcock · Dresden, DE
• Oliver Gutfleisch · Darmstadt, DE
• Gino Hrkac · Exeter, GB
• Thomas Schrefl · Herzogenburg, AT

Key dates

• Filing date: May 13, 2011
• Grant date: Dec 13, 2016
• Expiry date: Feb 22, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F10/126
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A rare earth magnet, which is represented by a neodymium magnet (Nd2Fe14B) and neodymium magnet films with applications in micro-systems. A method for producing a rare earth magnet, comprising: (a) quenching a molten metal having a rare earth magnet composition to form quenched flakes of nanocrystalline structure; sintering the quenched flakes; subjecting the sintered body obtained to an orientation treatment; and applying a heat treatment with pressurization at a temperature sufficiently high to enable diffusion or fluidization of a grain boundary phase and at the same time, low enough to prevent coarsening of the crystal grains, (b) thick films deposited on a substrate, applying an annealing to crystallize with pressurization at a temperature sufficiently high to enable diffusion or fluidization of a grain boundary phase and, at the same time, low enough to prevent coarsening of the crystal grains.