Thermodynamic Analysis of Intergranular Additives in Sintered Nd-Fe-B Magnet

Thermodynamic Analysis of Intergranular Additives in Sintered Nd-Fe-B Magnet
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烧结Nd-Fe-B磁体晶间添加剂的热力学分析

DOI:
10.4283/jmag.2017.22.2.244
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发表时间:
2017-06
影响因子:
0.5
通讯作者:
X.J. Xu
X.J. Xu
中科院分区:
材料科学4区
文献类型:
--
作者:
X. G. Cui;X. H. Wang;C. Y. Cui;G. C. Yin;C. D. Xia;X. N. Cheng;X.J. Xu

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为了更深入地了解晶间添加剂对烧结Nd-Fe-B磁体的影响,从而更好地改善其性能,对298.15-1400 K温度范围内添加剂(氧化物、氮化物和碳化物)与富Nd相之间的相互作用进行了热力学分析。可以发现,氧化物添加剂变得不如氮化物和碳化物稳定。除氧化钙外,几乎所有氧化物都能与富Nd相中的Nd反应。与氧化物添加剂不同,氮化物和碳化物的机理是通过各种元素来定义的,无论是与富Nd相中的Nd反应还是不反应。两种不同的机制会对磁体的微观结构和性能产生不同的影响。热力学分析与实验信息有较好的一致性。
To get deeper insight into the effect of intergranular additives in sintered Nd-Fe-B magnet and consequently improve the properties better, the interaction between additives (oxide, nitride, and carbide) and Nd-rich phase in the temperature range of 298.15-1400 K was analyzed thermodynamically. It can be found that the oxide additives became less stable than nitrides and carbides. Except for calcium oxide, almost all oxides could react with Nd from Nd-rich phase. To be different from oxide additives, the mechanism of nitrides and carbides was defined with various elements, either reaction with Nd from Nd-rich phase or not. The two different mechanisms would show different effects on the microstructure and hence properties of magnet. The thermodynamic analysis had a better agreement with the experimental information.
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发表时间: 1997-03
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