对含有0~4.00%（质量分数）不等量Dy的钕铁硼基体进行了Dy晶界扩散,并分析比较其磁性能、成分以及微观结构。研究发现,所有样品在经过Dy扩散后均提升263.4~316.7 k A/m的矫顽力,且Dy质量分数均增加了0.30%~0.35%左右,与基体初始Dy含量...对含有0~4.00%（质量分数）不等量Dy的钕铁硼基体进行了Dy晶界扩散,并分析比较其磁性能、成分以及微观结构。研究发现,所有样品在经过Dy扩散后均提升263.4~316.7 k A/m的矫顽力,且Dy质量分数均增加了0.30%~0.35%左右,与基体初始Dy含量并没有明显关联性。进一步分析发现,不同样品的矫顽力提高幅度并不正比于Dy增加量,基体Dy含量越高,单位量Dy元素的矫顽力提高效率越低。结合EPMA面分布图分析后认为,在不含Dy的基体中进行扩散的过程是晶界区域中Dy从无到有的过程,这时的矫顽力提高效率最高。展开更多
The technology of using high abundance rare earth element Ce in permanent magnets has attracted many concerns.In this work,the magnetic properties and microstructures of hot deformed(Nd_(1-x)Ce_(x))_(13.8)Fe_(76.1)Co_...The technology of using high abundance rare earth element Ce in permanent magnets has attracted many concerns.In this work,the magnetic properties and microstructures of hot deformed(Nd_(1-x)Ce_(x))_(13.8)Fe_(76.1)Co_(4)Ga_(0.5)B_(5.6) magnets and a selective magnet treated with PrCu grain boundary diffusion process(GBDP) were investigated systematically.It is found that Ce is beneficial to improving the plastic deformation ability of NdFeB magnets.The strongest c-axis orientation is achieved in the HD magnets with Ce concentration of x=0.3,resulting in good comprehensive magnetic properties of B_(r)=13.00 kGs,H_(cj)=10.12 kOe,(BH)_(max)=38.42 MGOe.Based on that,the GBDP was implemented on the magnets with the best orientation using Pr_(68)Cu_(32) ribbons and the magnetic properties of B_(r)=12.87 kGs,H_(cj)=15.65 kOe,(BH)_(max)=37.48 MGOe were obtained.The results of composition distribution and Curie temperature test of the GBDPed magnets illustrate that Pr diffuses into the(Nd,Ce)_(2)(Fe,Co)_(14)B grains to substitute Ce,which not only improves the Curie temperature of the grains,but also enhances the magnetic performance of the magnets.Through GBDP,the thermal stability of magnets has also been improved.展开更多
文摘对含有0~4.00%（质量分数）不等量Dy的钕铁硼基体进行了Dy晶界扩散,并分析比较其磁性能、成分以及微观结构。研究发现,所有样品在经过Dy扩散后均提升263.4~316.7 k A/m的矫顽力,且Dy质量分数均增加了0.30%~0.35%左右,与基体初始Dy含量并没有明显关联性。进一步分析发现,不同样品的矫顽力提高幅度并不正比于Dy增加量,基体Dy含量越高,单位量Dy元素的矫顽力提高效率越低。结合EPMA面分布图分析后认为,在不含Dy的基体中进行扩散的过程是晶界区域中Dy从无到有的过程,这时的矫顽力提高效率最高。
基金the National Key Research and Development Program of China(2016YFB0700902)。
文摘The technology of using high abundance rare earth element Ce in permanent magnets has attracted many concerns.In this work,the magnetic properties and microstructures of hot deformed(Nd_(1-x)Ce_(x))_(13.8)Fe_(76.1)Co_(4)Ga_(0.5)B_(5.6) magnets and a selective magnet treated with PrCu grain boundary diffusion process(GBDP) were investigated systematically.It is found that Ce is beneficial to improving the plastic deformation ability of NdFeB magnets.The strongest c-axis orientation is achieved in the HD magnets with Ce concentration of x=0.3,resulting in good comprehensive magnetic properties of B_(r)=13.00 kGs,H_(cj)=10.12 kOe,(BH)_(max)=38.42 MGOe.Based on that,the GBDP was implemented on the magnets with the best orientation using Pr_(68)Cu_(32) ribbons and the magnetic properties of B_(r)=12.87 kGs,H_(cj)=15.65 kOe,(BH)_(max)=37.48 MGOe were obtained.The results of composition distribution and Curie temperature test of the GBDPed magnets illustrate that Pr diffuses into the(Nd,Ce)_(2)(Fe,Co)_(14)B grains to substitute Ce,which not only improves the Curie temperature of the grains,but also enhances the magnetic performance of the magnets.Through GBDP,the thermal stability of magnets has also been improved.
基金Beijing Youth Top-notch Team Support Project of China (2018000021223TD10)Hebei Province Fund for Transformation of Major Science and Technology Achievements of China (19041029Z)Hebei Province International Science and Technology Cooperation Base Construction Project of China(20591002D)。
