The products and manufacturing processes of newly developed rare earth bonded magnets are highlighted for isotropic Nd Fe B based magnet,anisotropic Nd Fe B magnet,and Sm Fe N system magnets including SmFe 7N x+α Fe exchange spring magnet and injection molded Sm 2Fe 17 N 3 anisotropic magnet.
介绍了新开发的稀土粘结磁体 (各向同性Nd Fe B系、各向异性Nd Fe B系、Sm Fe N系、交换弹簧类等 )的产品及制造工艺。
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.
The importance of phase diagram study in material design is illustrated by examples of development of nanocrystalline materials with two phases, wide hysteresis shape memory alloys, Nd Fe B magnet alloy, TiAl intermetallics and steel used at super low temperatures.
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...
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%.
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...
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.
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...
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.
nd fe b magnet
钕铁硼磁体
查询“nd fe b magnet”译词为用户自定义的双语例句
相关查询
2008 CNKI－中国知网