CAJ | 학술논문

采用放电等离子烧结及后续热变形技术制备各向异性Nd-Fe-B磁体，研究烧结温度对放电等离子烧结Nd-Fe-B磁体微观组织和磁性能的影响。随着烧结温度在650~900°C范围内的升高，烧结态Nd-Fe-B磁体的剩磁、内禀矫顽力及最大磁能积呈现先升后降的趋势。在800°C下烧结所获得磁体的磁性能最佳。随后，对800°C烧结后具有最佳磁性能的磁体采用放电等离子烧结技术进行后续热变形处理。与初始吸氢-歧化-脱氢-再复合粉末和烧结态磁体相比，热变形磁体拥有更显著的各向异性和更好的磁性能。当热变形温度为800°C且压缩比为50%时，热变形磁体中的Nd2Fe14B晶粒呈扁平片状且不发生异常长大；磁体沿热压方向具有最佳的磁性能：Br、Hcj和(BH)max分别为1.16 T、449 kA/m和178 kJ/m3。
채용방전등리자소결급후속열변형기술제비각향이성Nd-Fe-B자체，연구소결온도대방전등리자소결Nd-Fe-B자체미관조직화자성능적영향。수착소결온도재650~900°C범위내적승고，소결태Nd-Fe-B자체적잉자、내품교완력급최대자능적정현선승후강적추세。재800°C하소결소획득자체적자성능최가。수후，대800°C소결후구유최가자성능적자체채용방전등리자소결기술진행후속열변형처리。여초시흡경-기화-탈경-재복합분말화소결태자체상비，열변형자체옹유경현저적각향이성화경호적자성능。당열변형온도위800°C차압축비위50%시，열변형자체중적Nd2Fe14B정립정편평편상차불발생이상장대；자체연열압방향구유최가적자성능：Br、Hcj화(BH)max분별위1.16 T、449 kA/m화178 kJ/m3。
Bulk anisotropic Nd-Fe-B magnets were prepared from hydrogen-disproportionation-desorption-recombination (HDDR) powders via spark plasma sintering (SPS) and subsequent hot deformation. The influence of sintering temperature on the structure and magnetic properties of the spark plasma sintered Nd-Fe-B magnets were studied. The remanence Br, intrinsic coercivity Hcj, and the maximum energy product (BH)max, of sintered Nd-Fe-B magnets first increase and then decrease with the increase of sintering temperature,TSPS, from 650 °C to 900 °C. The optimal magnetic properties can be obtained whenTSPS is 800 °C. The Nd-Fe-B magnet sinter treated at 800 °C was subjected to further hot deformation. Compared with the starting HDDR powders or the SPS treated magnets, the hot-deformed magnets present more obvious anisotropy and possess much better magnetic properties due to the goodc-axis texture formed in the deformation process. The anisotropic magnet deformed at 800 °C with 50% compression ratio has a microstructure consisting of well aligned and platelet-shaped Nd2Fe14B grains without abnormal grain growth and exhibits excellent magnetic properties parallel to the pressing axis.