CAJ | 학술논문

对添加Nb的Nd-Fe-B铸态合金的结晶状态、磁体的显微组织形貌、磁性能等进行了详细研究。研究发现：添加Nb使Nd-Fe-B铸态合金的片状晶尺寸明显变小，Nd-Fe-B磁粉的抗氧化性能提高，磁体的晶粒结构均匀一致，不含Nb的Nd-Fe-B磁体晶粒的大小、形状差异非常大，其显微组织呈现出一种类似“团窝”状的结构。这种结构使Nd-Fe-B磁体的磁性能恶化。添加一定量的Nb元素后，这种“团窝”状结构消失，磁体的晶粒更加规则，组织结构更加均匀。采用常规的湿法制粉工艺，用Nb含量（摩尔分数）为0．44％的Nd-Fe-B合金得到了（BH）max为336kJ／m3（42．1MGOe）的烧结磁体，而相同成分的不含Nb磁体的最大磁能积只有194kJ／m3。
대첨가Nb적Nd-Fe-B주태합금적결정상태、자체적현미조직형모、자성능등진행료상세연구。연구발현：첨가Nb사Nd-Fe-B주태합금적편상정척촌명현변소，Nd-Fe-B자분적항양화성능제고，자체적정립결구균균일치，불함Nb적Nd-Fe-B자체정립적대소、형상차이비상대，기현미조직정현출일충유사“단와”상적결구。저충결구사Nd-Fe-B자체적자성능악화。첨가일정량적Nb원소후，저충“단와”상결구소실，자체적정립경가규칙，조직결구경가균균。채용상규적습법제분공예，용Nb함량（마이분수）위0．44％적Nd-Fe-B합금득도료（BH）max위336kJ／m3（42．1MGOe）적소결자체，이상동성분적불함Nb자체적최대자능적지유194kJ／m3。
In this work the effect of Nb addition on the microstructures of Nd-Fe-B as-cast alloys and the magnetic properties of anisotropic Nd-Fe-B sintered magnets were investigated in detail． Experiments revealed that the size of the plate-like grains of Nd-Fe-B as-cast alloys could be drastically decreased and the grain shape of the sintered magnets could be markedly regularized by Nb addition， and thus the magnetic properties of the magnets were improved． As a result， magnet with the magnetic property of （BH）max＝336kJ／m3（42．1MGOe） was obtained by conventional wet process with 0．44at％Nb containing alloy．