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NdFeB母合金吸氢和脱氢过程的研究 总被引:1,自引:0,他引:1
研究了吸氢过程中氢压和合金成分的变化对饱和吸氢量及活化时间的影响,脱氢过程中温度对脱氢量的影响以及歧化反应发生的温度条件。调节吸氢过程中的氢压分别为0.1MPa、0.6MPa,结果发现,随氢压的提高饱和吸氢量增大,活化时间减少。制备(Nd0.935Dy0.065)xFe79.7B6.1(x=13,13.5,14,14.5,15,15.5)的鳞片,保持氢压不变,发现随稀土含量的提高,也具有上述规律。通过差热分析方法测量脱氢过程中几种反应发生的温度条件,在设定的温度下脱氢,并测量脱氢量。结果发现在恒压条件下,600℃下脱氢量为53%,700℃下脱氢,合金已发生歧化反应。 相似文献
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IthasbeenfoundthatthemicrostructuresofcastalloyshavegreatinfluenceonmagneticpropertiesinsinteredNdFeBmagnets .SothecharacteristicsofNdFeBcastalloys ,includingtheshapeofcrystal ,thecompositionanddispersionofphases ,havebeenstud iedbythepeople[1~4 ] .However ,therearefewre portsonthecharacteristicsofcrystalgrowth[5] .Inthispaper ,crystalgrowthorientationofcastalloyspre paredbydifferentprocessingwasinvestigatedusingX raydiffraction ,andtheinfluenceofcoolingrateoncrystalgrowthorientationwasana… 相似文献
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Investigation of Coercivity Mechanism for Nd-Fe-B Magnets Prepared by Combination of Strip-Casting with Hydrogen Decrepitation Techniques 总被引:1,自引:1,他引:0
The coercivity mechanism of Nd-Fe-B magnets prepared by combination of strip-casting with hydrogen decrepi-tation techniques was investigated. The microstructure of (Nd0.935Dy0.065)14.5Fe79.4B6.1 magnet was observed. The average grain size is about 6 ~ 12 μm. The magnetizing field dependence of the hardmagnetic properties for the (Nd0.935Dy0.065)14.5 Fe79.4B6.1 and the temperature dependence of the coercivity for the Nd14.5Fe79.4B6.1 were investigated. Results show that the coereivity for magnets prepared by the combination of strip-casting with hydrogen decrepitation techniques is controlled by the nucleation mechanism. 相似文献
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