Metal-bonded RE-Fe-B Magnets | Project and Innovation Support

Metal-bonded RE-Fe-B Magnets

Publication Number: US20160322136A1
Application Date: 30. 4. 2015
Assignee/Applicant: Jožef Stefan Institute [SI]
Inventor: Luka Kelhar, Paul Mcguinnes, Spomenka Kobe
Title: Metal-bonded RE-Fe-B Magnets
Description: This invention relates to bonded magnets and the method for their production. Such magnets benefit from the fact that for binding, they utilize Low-Melting-Point metal or an alloy, and thus can be used at temperatures where conventional bonded magnets cannot operate. This composite magnet is made of magnetic phase and non-magnetic metallic binder. The mechanical and magnetic properties of metal-bonded magnets vary with the ratio of the two phases. The optimum result is achieved when adding 20-40 wt. % of binder. A huge difference can be observed between conventional and spark-plasma sintering (SPS) processing. An increase in remanence is up to 30%, as a consequence of simultaneous application of pressure and temperature. Additionally, minimized expo- sure time contributes to preservation of magnetic properties, which is a strong advantage of SPS technique. The value added of such magnets is the ability to withstand temperatures above 200° C., due to metallic matrix.
Category: Nanotechnology and New Materials
Technology application codes: Physical and exact sciences, Industrial manufacturing, material and transport
Market application codes: Communications, Computer related, Other electronics related
Patent offices: US