The Effect of the Processing Temperature on the Microstructures of Pr-Fe-Co-B-Nb HDDR Magnets

Abstract:

Pr14FebalCoxB6Nb0.1 magnets have been produced using the hidrogenation disproportionation desorption recombination (HDDR) process. The effect of the Co content (x= 0, 4, 8, 10, 12, 16) and the reaction temperature (800-900 °C) on the microstructure and magnetic properties of the HDDR material have been investigated. The processing temperature (desorption/recombination) affected the microstructure and magnetic properties of the bonded magnets. The alloy with low cobalt content (4 at.%) required the highest reaction temperature (880°C) to yield anisotropic bonded magnets. The optimum temperature for alloys with 8 at.% Co and 10 at.% Co were 840°C and 820°C, respectively. Alloys with high cobalt content (12 at.% and 16 at.%) were processed at 840°C. Each alloy required an optimum reaction temperature and exhibited a particular microstructure according to the composition. Pr14Fe80B6Nb0.1 magnets have been processed for comparison.

• Periodical: Materials Science Forum (Volumes 591-593)
• Pages: 108-113
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.591-593.108
• Online since: August 2008
• Authors: S.C. Silva, Eliner Affonso Ferreira, R.N. Faria, Hidetoshi Takiishi
• Keywords: HDDR Magnet, Hydrogenation, Permanent Magnet, Pr-Fe-B Magnet

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