Magnetic-field temperature-pressure formation

A technology of warm pressing forming and process, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve problems such as compact density, unsatisfactory orientation degree, deterioration of compact orientation degree, affecting material properties, etc.
CN101028652AInactive Publication Date: 2007-09-05UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Publication Date
2007-09-05
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

A magnetic-field thermo-pressing process for preparing the high-performance magnetic material with magnetic anisotropy includes such steps as preparing the ultra-magnetostrictive RE powder or permanent-magnet NdFeB powder or permanent-magnet SmCo powder in vacuum or inertial gas or organic medium, mixing it with adhesive, coupling agent and lubricant, and thermopressing at 80-350 deg.C under 300-900 MPa in a magnetic field (1.5-2.5T).
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Description

technical field

[0001] The invention belongs to the technical field of material preparation, and in particular provides a magnetic field warm pressing forming process, which is suitable for preparing high-performance magnetic materials with magnetic anisotropy characteristics, such as bonded rare earth giant magnetostrictive materials and bonded rare earth permanent magnets Material. Background technique

[0002] Compression forming is the most common forming method in powder metallurgy technology. Its purpose is to obtain a compact of a certain shape and size, and to make it have a certain density and strength. Since only the pressure field acts in this forming process, it is only suitable for the manufacture of isotropic materials, and there is a large friction between powder and powder, powder and mold wall during the pressing process, which makes the density and strength distribution of the green compact uneven. Uniformity, powder compaction and hardening are difficult...

Claims

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