Material alloy used in the production of the R-T-B type sintered magnet, the manufacturing method of the R-T-B type sintered magnet alloy and mixture

摘要

In the case of r2fe14b as a phase of the phase of the sintered phase, the two phase method was used for the production of the sintered alloy with less r content than the phase of the phase and the grain boundary phase alloy rich in the R component in the sintering. In addition to the phase, it contains a large amount of oxidized limelar r rich phase and harmful dendrite u03b1 phase. The main phase system alloy provided by the present invention has a low dendrite u03b1 phase and has a small lemaid type R rich phase and contains a lamellar type u03b1 Fe phase. For this reason, the oxidation resistance is excellent, and as a result, the characteristics of the magnet are improved. Further, the sintering of the main phase alloy of the present invention and the grain boundary phase alloy to produce a sintered magnet by the two alloy method makes it possible to reduce the abnormal growth of crystal grains.