SILVA, S.C.CASINI, J.C.FARIA, R.N.TAKIISHI, H.2014-11-192014-11-192015-04-012014-11-192014-11-192015-04-01SILVA, S.C.; CASINI, J.C.; FARIA, R.N.; TAKIISHI, H. Magnetic properties and crystallite sizes of HDDR powders obtained from PrFeCoBNb based alloys. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 18., 24-28 de novembro, 2008, Porto de Galinhas, PE. <b>Resumos...</b> p. 6522. Disponível em: http://repositorio.ipen.br/handle/123456789/20120.http://repositorio.ipen.br/handle/123456789/20120The first goal of this work involved the study of HDDR powders obtained from annealed alloys with a general formula: PrxFe77.9-xCo16B6Nb0.1 (x = 12; 12.5; 13; 13.5 and 14). The alloys were processed at desorption/recombination temperature of 840ºC. The highest magnetic properties were obtained with 13.5 at. % Pr (Br= 1000mT and iHc= 890mT). The alloy with a minimum praseodymium content (12 at. %) exhibited the lowest magnetic properties (Br= 350mT e iHc= 120mT). The second aim of the work involved the characterization of HDDR powders using X-ray diffraction analysis for phase quantification and crystallite medium sizes determination of the hard magnetic phase. The processed powders were morphologically characterized by scanning electron microscopy (SEM).6522openAccesspowderspraseodymium alloysiron alloyscobalt alloysboron alloysniobium alloysmagnetic propertiesx-ray diffractionscanning electron microscopyhydrogenationhydrogenResumo de eventos científicos