Heat resistant plastic magnets

“…1 The authors also believe that coercivity is influenced by differences in the methods used to produce Sm 2 Fe 17 N 3 fine powder. For instance, the coercivity of fine (3 µm) Sm 2 Fe 17 N 3 powder produced directly through reduction-diffusion of Sm-Fe precursors prepared by a wet-chemical technique (direct synthesis method) showed higher coercivity (13 kOe) 2 than powder with a size of about 2 µm prepared by pulverizing coarse Sm 2 Fe 17 N 3 powder (11 kOe). 3 Pulverized particles are thought to have strain and edges which easily form reverse magnetic domain nucleation sites and thereby reduce coercivity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of optimal route to fabricate submicron-sized Sm2Fe17 particles with reduction-diffusion method

2016

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Submicron-sized Sm2Fe17 powder samples were fabricated by a non-pulverizing process through reduction-diffusion of precursors prepared by a wet-chemical technique. Three precursors having different morphologies, which were micron-sized porous Sm-Fe oxide-impregnated iron nitrate, acicular goethite impregnated-samarium nitrate, and a conventional Sm-Fe coprecipitate, were prepared and subjected to hydrogen reduction and reduction-diffusion treatment to clarify whether these precursors could be convert to Sm2Fe17 without impurity phases and which precursor is the most attractive for producing submicron-sized Sm2Fe17 powder. As a result, all three precursors were successfully converted to Sm2Fe17 powders without impurity phases, and the synthesis route using iron-oxide particle-impregnated samarium oxide was revealed to have the greatest potential among the three routes.

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“…Therefore, for wider driving range and an increase of the generating power, we fabricated a fully magnetic impeller with an injection molding method using Sm 2 Fe 17 N 3 powder. [7][8][9] Although the magnetic property (BHmax) of plastic magnets is lower than that of sintered magnets, the former have higher degrees of freedom for shape and better dimensional stability. The fabricated fully magnetic impeller resulted in an improved driving range with an increase of the generated power in the pump.…”

mentioning

confidence: 99%