摘要
目前,Nd-Fe-B永磁体是磁性最强的磁体。文章通过计算Fe2B、NdB4、Nd2Fe14B(主相)和Nd2FeB3(η相)相变过程的吉布斯自由能以及Nd2O3、Fe2O3和B2O3氧化过程的吉布斯自由能,研究了Nd-Fe-B体系的热力学性质。结果表明:Nd2Fe14B相在Nd-Fe-B体系中容易生成,磁体制备过程中要避开NdB4和Nd2FeB3相的生成温度(降低磁性能);由Nd2O3、Fe2O3和B2O3氧化过程的吉布斯自由能可知,Nd、Fe和B元素易氧化,因此,制备过程中要尽量降低Nd-Fe-B体系中的含氧量。
The Nd2Fe14alloy is the strongest hard magnetic material.In this paper,the thermodynamic properties of Nd-Fe-B system is studied by calculateing the change in Gibbs free energy（ΔG） of the phase transformations of Fe2B、NdB4、Nd2Fe14B（ф phase）、Nd2FeB3（η phase） and the Oxidation reactions of Nd2O3、Fe2O3 and B2O3.The conclusion has been drawn that the formation of the Nd2Fe14B phase is feasible in the Nd-Fe-B alloy system and the fabrication temperature of the Nd-Fe-B permanent magnets must avoid the temperature of the NdB4 and Nd2FeB3 phase transformations.The elements of Nd、Fe and B are easily oxidated and form oxides（Nd2O3、Fe2O3 and B2O3）,so the amount of the oxygen should be controlled when fabricateing the Nd-Fe-B magnets.
出处
《黄石理工学院学报》
2011年第1期4-7,共4页
Journal of Huangshi Institute of Technology
