SUELANNY CARVALHO DA SILVA
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Artigo IPEN-doc 12483 Microstructure and magnetic properties of PrFeCoBNb sintered magnets produced from Hd and HDDR powder2007 - FERREIRA, E.A.; SILVA, S.C.; PERIGO, E.A.; FARIA, R.N.; TAKIISHI, H.Artigo IPEN-doc 16321 The effect of the processing temperature on the microstructures of Pr-Fe-Co-Nb HDDR magnets2008 - SILVA, S.C.; FERREIRA, E.A.; FARIA, R.N.; TAKIISHI, H.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 ºC) 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.