通过X射线衍射（XRD）、扫描电镜（SEM）和能谱分析（EDX）等手段重点研究了Sm-Fe17合金在氢化2歧化过程中的相组成、相的变化以及微观结构的演化规律。研究表明：在0.1MPa的H2气氛下，Sm-Fe17合金首先吸氢；400℃时合金出现部分脱氢现象；在T≥500℃逐渐开始歧化为SmHx和α2Fe，同时生成了大量的微晶或非晶组织；随着温度的升高，合金中的微晶非晶逐渐晶化，750℃时晶化完全，晶粒长大至20～100nm。通过对Sm-Fe17合金的氢化2歧化过程研究，建立了该过程的微观结构变化规律的物理模型。

The influence of Pr on thermal stability, microstructure, and magnetic properties of melt2spun (Nd1-x Prx) 10.5 (FeCoZr) 83.5B6 (x=0,0.2,0.4,0.6,0.8,1.0) alloy was investigated. By sub2overquenching to get the mixture of amorphous and fine crystallites and post annealing under the optimum conditions,bonded magnets with the best magnetic properties were prepared. With the increase of Pr content, Hci increases, but Br decreases. (BH) max of magnets bonded with 3.25 %(mass fraction) epoxy reaches the maximum of 7016 kJ•m-3 at x=0.6～0.8. Substitution of Pr for Nd causes the crystallization temperature and crystallization energy to decrease. This ther-mal stability difference results in that (Nd0.2Pr0.8) 10.5 (FeCoZr) 83.5B6 alloy has a rougher and more inhomogeneous microstructure than that of (Nd0.8Pr0.2) 10.5 (FeCoZr) 83.5B6 alloy, furthermore, leads to the decrease of B r with the increase of Pr content.

For nanophase (Nd, Pr) FeB/α2Fe composite alloys were prepared by melt spinning, the appreciable addition of Zr reduces their average grain size. Observed by atomforce microscopy (AFM), the average grain diameter of crystallized ribbons on their free surface, reduces from 175 nmof Zr2free alloy to 79 nmof Zr21at%, by about 55%. If the concentra-tion exceeds 1%, the effects of Zr on fining grain size are evidently weakened. The average grain size on free surface of Zr2115at% is 72 nm. With the addition of 1at% Zn, the bonded magnets has the best combination of properties: Br =01675 T, Hci=616kA•m-1, (BH) max=77 kJ•m-3. Below 1at%, the coarser grains lead to a lower magnetic property. Beyond 1at%, the layer of Zr-rich intergranular phase will thicken, which results in weakening of the exchange coupling among adjacent grains, and then causes degrading of magnetic properties of magnets.

The optimum quenching rates and annealing conditions to prepare near stoichiometrical (Nd,Pr)12 (FeCoZr) 82B6 bonded magnets were investigated by using sub-overquenching and post annealing method. The quenching rates, annealing temperatures, and annealing time directly influence the microstructure and magnetic properties of alloy ribbons. The opti-mum magnetic properties of bonded magnets are achieved by melt spinning at 24ms-1wheel surface speed, annealing at 655℃ for 10 min, and bonding with 3.25% (mass fraction) epoxy. The best magnetic properties of remanence Br, in-trinsic coercivity Hci and maximum energy product (BH) max are 0. 669 T, 811 kA•m-1, and 75kJ •m-3, respectively.

By using sub-overquenching and annealing method which has a wide processing window, (Nd, Pr) x (Fe-CoZr) 94-xB6 (x = 12, 10. 5, 10, 9) bonded magnets were prepared and the effect of rare earths content on magnetic prop-erties was investigated. Being spun at sub-overquenching speed the as-spun ribbons consist of amorphous phases mixed with fine crystallites. After crystallization under optimum annealing conditions and bonded with 3.25% (mass fraction) e-poxy, the magnets obtained the optimum magnetic properties. The rare earths content directly determines the magnetic properties. With the reduction of rare earths content, Br increases but Hci and (BH) max decrease. x=10 is the critical value for the magnetic properties change. Below this value, Br increases slowly meanwhile Hci and (BH) max decrease strongly because alloy contains extra fractions of soft magnetic phase which are not coupled with the hard magnetic phase. This experimental result is consistent with the calculated results using the model of volume fraction of soft magnetic phase coupled completely suggested.

The effect of particle size and dist ribution of rapidly quenching NdFeB magnetic powder on the magnet-ic properties of polymer-bonded NdFeB permanent magnet was studied. The results show that the particle size and the dist ribution of rapidly quenching NdFeB magnetic powder have significant effects on the magnetic properties of polymer-bonded NdFeB permanent magnet. As long as the size and the dist ribution of rapidly quenching NdFeB powder are within the right range, high magnetic properties of polymer-bonded NdFeB permanent magnet can be ob-tained. This is mainly because the rapidly quenching NdFeB magnetic powder has high hardness and is scale-shaped. The larger the size of rapidly quenching NdFeB particles is, the more difficult it is to obtain high density of bonded NdFeB magnet. However the structure will be dest royed if the size is too small. It results in the deterioration of magnetic properties. The mechanism is also discussed.

磁性槽楔的性能是决定磁楔能否应用的关键因素。文中以自制的DCL层压磁楔为研究对象，系统研究了DCL磁楔的力学、磁、电性能及其对电机性能的影响，发现结构差异和基体树脂的改性，DCL磁楔的力学性能大大超过目前广泛应用的MCR模压磁楔和349层压磁楔；DCL磁楔的相对磁导率在1kA/m的磁场下可达8.4，50kA/m的磁场下仍能达到5.1；DCL磁楔的绝缘电阻达到9.4107W。DCL磁楔取代电机定子中的绝缘槽楔后，虽然电机的起动转矩和最大转矩减小，但电机的起动电流和空载电流下降，电机温升降低，定转子的表面损耗和脉振损耗减少，电机效率得到提高。

采用快淬、热处理及模压成形工艺，制备了成分为Nd10.5Fe78.4-xCo5ZrxB6.1（x＝0，1.0，1.5，2.0，2.5）的5种粘结永磁体。采用XRD，DTA，TEM等方法对合金的组织结构和晶化行为进行了研究。结果表明：Zr含量的增加可提高材料的非晶形成能力；当Zr添加到一定量时，形成高熔点的Fe2Zr相，产生细化晶粒的作用；添加Zr元素显著地提高了合金的矫顽力，改善了退磁曲线矩形度，从而提高了最大磁能积。Nd10.5Fe78.4-xCo5ZrxB6.1永磁体在x＝2时获得最佳磁性能，Br＝0.659T，Hcj＝628kA/m，Hcb＝419kA/m，（BH）m=73kJ/m3。

研究了H2压力、温度对NdFeB铸块和铸片吸氢的影响。结果表明。NdFeB铸块和铸片在吸氢过程中均明显存在孕育期。其吸氢过程均可分为4个阶段：孕育期阶段、慢速吸氢阶段、快速吸氢阶段和缓慢吸氢阶段。随着H2压力（1×105Pa-4×105Pa）和温度（293K～373K）的升高，NdFeB铸块和铸片的吸氢速度加快，孕育期缩短。且当温度升至一定程度时，铸块的孕育期消失，而铸片的吸氢始终存在孕育期。铸片吸氢过程中的Ⅰ，Ⅱ，Ⅲ阶段的吸氢时间均明显长于铸块，而第Ⅳ阶段的吸氢时间则较短。研究同时表明。NdFeB铸块和铸片的吸氢量几乎不受氢气压力的影响，但随温度的升高，吸氢量减少。

为了优化合金成分以提高纳米复相Nd-Fe-Co-Zr-B系永磁合金磁性，采用均匀设计方法设计了Nd，Co，Zr和B的4因素6水平U18（64）实验方案。建立了合金成分与磁性之间的人工神经网络（ANN）预测模型。利用该预测模型对Nd-Fe-B合金的成分进行了优化。同时。利用所建立的人工神经网络预测模型研究了单个元素对Nd-Fe-B合金磁性的影响规律。以及多元素间的交互作用与合金磁性间的关系。结果表明，预测结果与实测结果吻合良好，预测结果的相对误差很小，Br的相对误差在1.66%以内。（BH）m的相对误差在1.94%以内。Hcj的相对误差在7.7%以内。