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b magnet     
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  b磁体
     So this results can be used for theoretical reference of Nd Fe B hydrogen resistance coating fabrication,and then new hydrogen resistance coatings can be designed on the base of atoms and molecular level. Experimentally,the fabrication of Nd Fe B hydrogen resistance coatings is studied. The thick-coating method is used to spread Ag and polymer on Nd Fe B magnet surface.
     对 Nd- Fe- B阻氢涂层的制备进行了实验研究 ,利用厚膜烧结方法在 Nd- Fe- B磁体表面涂覆银及高分子聚合物涂层 ,高压充氢实验结果表明 ,在 10 MPa、2 5℃的氢环境中 ,磁体充氢 178分钟未粉碎 ,最长可达2 88分钟 ,充氢后的磁体磁性能没有变化。
短句来源
     High performance NdFeB magnet produced by the strip casting (SC) was investigated. Compared with traditional ingot casting technology, the SC processing refines and homogenizes the columnar structures and suppresses the formation of αFe dendrites so that greatly improves the microstructure in the ascasted alloy. It was found that the Ndrich phase distributes uniformly along the grain boundaries of fine columnar matrix phase in the speed cooled strip.
     研究了用速凝铸造工艺制造高性能烧结Nd Fe B磁体·同传统的铸锭工艺相比,速凝铸造工艺细化柱状晶,阻止α Fe枝晶相的产生,改善了铸态合金的微观结构·柱状晶宽度基本在5~25μm之间,尺寸较均匀;
短句来源
  b铁
     To install and adjust B magnet, Q magnet, S magnet and vacuum in a support accurately, a laser tracker is adopted in the process of pre-assembly and pre-alignment of BEPCII.
     BEPCⅡ的预安装准直测量采用SMX公司的激光跟踪仪,将BEPCⅡ储存环半个支架单元的B铁、S铁、Q铁和真空盒等设备安装到支架上,并对每个设备进行测量调整。
短句来源
     Transforming instrument reference frame into B magnet reference frame by coordinate-transformation represents more visual relations among all parts.
     经过坐标变换,转化为B铁磁铁坐标系,更直观地表现了各个部件之间的相互关系。
短句来源
  b永磁体
     The characteristics of the resistance to acid and alkali of Nd Fe B permanent magnet were studied. The technological line for acidic electroless Ni P plating on Nd Fe B magnet was defined. The Ni P plating with good adhesion,lower porosity and corrosion resistance was odtained.
     研究了 Nd- Fe- B永磁体耐酸、碱性特征 ,确定了适合该材料酸性化学镀 Ni- P的一套完整工艺路线 ,得到了结合力强、孔隙率低、耐蚀性能好的 Ni- P镀层。
短句来源
  硼磁体
     The Preliminary Study on Effection of Nd Fe B Magnet for Trace Elements in Rhesus Monkeys
     钕铁硼磁体对机体微量元素影响的初步研究
短句来源

 

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      b magnet
    Texture induced magnetic anisotropy in Fe-Nd-B magnet preparedvia rapid solidification and hot extrusion techniques
          
    A special hydrogenation-dehydrogenation treatment of the Nd-Fe-B magnet cast can produce excellent isotropic magnet powders and the treated sample has passed a hydrogenation-disproportionation-recombination process.
          
    The seal was composed of two ferromagnetic polepieces and a Nd-Fe-B magnet.
          
    The corrosion resistance of the Nd-Fe-B magnet is closely related to the microstructure which is determined by controlling the minor elements such as C, O, and N.
          


    In order to reduce the Production cost for making Nd-Fe-B magnets, which has record magnetic Properties, a new production technology, reduction-diffusion process, was studied.In which Nd2O3 is used as start ing material to work out Nd-Fe-B permanent magnets directly.The effecte of the contents of Nd, as basic constituent, and Al, Co, as substitute constituents, and some technologic factors on permanent magnetic properties are studied.The practical permanent magnets of Nd-Fe-B and...

    In order to reduce the Production cost for making Nd-Fe-B magnets, which has record magnetic Properties, a new production technology, reduction-diffusion process, was studied.In which Nd2O3 is used as start ing material to work out Nd-Fe-B permanent magnets directly.The effecte of the contents of Nd, as basic constituent, and Al, Co, as substitute constituents, and some technologic factors on permanent magnetic properties are studied.The practical permanent magnets of Nd-Fe-B and Nd-Fe-Co-B are made out.The optimum magnetic properties are Br = 13.7T,MHc = 0. 46MA/m, (BH)max= 286.5KJ/m3 The experimental result shows that oxygen is harmful to magnet properties, so it must be controlled below 0.8%.

    为了降低具有卓越永磁性的Nd-Fe-B磁体的制造成本,使之更快得到推广使用,本文研究了采用还原—扩散工艺路线,直接用Nd_2O_3作为原材料制取Nd-Fe-B磁体的方法、研究了基本组元Nd和添加元素CO、Al的含量对永磁性能的影响,成功地制造出Nd-Fe-B系永磁体。其中最佳性能为Br=1.30T,_MH_C=0.46MA/m,(BH)_(max)=286.5KJ/m~3。实验结果还表明,氧在合金中起着有害作用,为了获得优异的磁性能,含氧量必须被控制在0.8%以下。

    Curie temperature for Nd-Fe-B magnet was determined by DSC set and thermal demagnetization curve, called σ-T curve, was drawn by magnetic balance. High-temperature metallography was used for directly observing the domain variation with temperature.Both melting process of Nd-rich phase and oxidizing process on specimen surface were observed as well.According to the experiments, the Cuire temperature of Nd2Fe14B phase is 307.51℃ (580.5K) and the melting point of Nd-rich phase is approximately 6001....

    Curie temperature for Nd-Fe-B magnet was determined by DSC set and thermal demagnetization curve, called σ-T curve, was drawn by magnetic balance. High-temperature metallography was used for directly observing the domain variation with temperature.Both melting process of Nd-rich phase and oxidizing process on specimen surface were observed as well.According to the experiments, the Cuire temperature of Nd2Fe14B phase is 307.51℃ (580.5K) and the melting point of Nd-rich phase is approximately 6001. The domain structure in Nd2Fe14B phase is just the same as observed in Co single crystal with strong uniaxial anisotropy. If the domain space becomes wide enough, in order to reduce magnetostatic energy of system, then a certain amount of cone-like reversed domains would appear on the surface rather than transverse closure domains, as in the case of Si-Fe sheet. Magnetic contrast of domain decreases with increasing temperature continuously, but, neither local migration of domain walls nor partial regulation of domains can be found until Curie temperature.During cooling, renucleation of domain in the thermal-demagnetized specimen, which has to fit in with crystal orientation, still shows some randomness; consequently, the domains in same grain before and after thermal demagnetization are almostly identical. The Variation of hardness for the magnet within temperature range of 20-750℃ was studied.

    用DSC仪测定了Nd-Fe-B磁体的居里温度,以磁秤法绘制了热退磁曲线(σ-T)。并用高温金相显微镜直接观察了Nd-Fe-B磁体畴结构随温度的变化,对畴结构的特点作了初步讨论。同时观察了富钕相的熔融和试样表面的氧化过程。测定了在20℃到750℃磁体维氏硬度的变化。

    The normal composition Nd15Fe77B8 is usually used for producing sintered Nd-Fe-B magnets. The magnets are generally composed of Nd2-Fe14B main phase plus Nd-rich and B-rich minor phases. This paper has emphatically investigated the condition necessary for the existence of the B-rich phase, the structure of the B-rich phase and its influence on magnetic properties. The B-rich phase is a stable NdFe4B4 compound and belongs to the tetragonal system with a=7.10A...

    The normal composition Nd15Fe77B8 is usually used for producing sintered Nd-Fe-B magnets. The magnets are generally composed of Nd2-Fe14B main phase plus Nd-rich and B-rich minor phases. This paper has emphatically investigated the condition necessary for the existence of the B-rich phase, the structure of the B-rich phase and its influence on magnetic properties. The B-rich phase is a stable NdFe4B4 compound and belongs to the tetragonal system with a=7.10A and c=26.47A, having a weak magnetic property. A large number of investigations has shown that the magnetic properties of Nd-Te-B magnets depend directly on its microstructure. Though the influence of the B-rich phase on the coercivity of the magnets is not as essential as the Nd-rich phase, its existence decreaces the saturation magnetization of the magnets. The optimum Theoptimum performance magnets with maximum energy product of 355.8kJ/m3 have been obtained by reducing or eliminating the B-rich phase throughc ontrolling the composition of the alloy.

    制造Nd-Fe-B烧结磁体通常采用Nd_(15)Fe_(77)B_8公称合金成分。这种磁体一般由主相Nd_2Fe(14)B和次要富钕相和富硼相组成。本文着重研究了富硼相的存在条件、结构及其对磁性能的影响。富硼相是个NdFe_4B_4稳定的化合物,属于四角晶系,晶格常数α=7.10A,c=26.47A,为弱磁性相。大量研究表明,Nd-Fe-B合金的磁性能直接取决于其相组成。富硼相对磁体矫顽力的影响不象富钕相那样至关重要,但是它的存在会降低磁体的饱和值,我们通过调整合金成分,力图避免或减少富硼相,得到了磁能积为355.8kJ/m~3的最佳性能磁体。

     
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