Xici Magnetoelectricity Co.

Mianyang, China

Xici Magnetoelectricity Co.

Mianyang, China
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Tang J.,Mianyang Normal University | Tang J.,China Academy of Engineering Physics | Zhang M.,Yantai Zhenghai Magnetic Material Co. | Wang X.,Mianyang Normal University | And 4 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2015

There are 10%~30% superfluous offcut, oxydic powder in moulding processing, waste products with sintering fault and after being applied. In these materials, there are a lot of Fe and rare elements, and most researches are about rare earth elements recycling and a few about Fe element recycling. However, other elements are discarded or disposed by some methods, which causes material waste and the increase of cost. So in this paper, (PrNd)xB1.05Al0.5Nb0.3Fe98.15-x alloys with a few discarded Nd-Fe-B alloys were prepared by physical method for avoiding waste of resources, and were also comparatively researched with (PrNd)xB1.05Al0.5Nb0.3Fe98.15-x alloys without waste. It was indicated that the X-ray diffraction (XRD) patterns and change law of flux of samples with waste and without waste were similar when they were simultaneously aged at different temperatures. The decreased flux values of these two samples aged at 50℃ for 1 h were 0.51 and 0.52 Wb, respectively, and those values were 0.96 and 0.95 Wb with 70℃×1 h aging. Moreover, they were 0.80 and 0.82 Wb if aged at 90℃ for 1 h. The particle size of sample with waste was a little bigger than that of sample without waste. In addition, the specific surface area of the former was smaller than that of the latter. Furthermore, its discreteness was also bigger than that of the latter. However, the microstructures of the two samples had few differences. ©, 2015, Editorial Office of Chinese Journal of Rare Metals. All right reserved.


Jiang H.,Mianyang Normal University | Xiao L.,CAEP - China Academy of Engineering Physics | Wei C.,Mianyang Normal University | Tang J.,Mianyang Normal University | And 4 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2012

(PrNd) 32.3Nb 0.70Al 0.60 Cu 0.20B 1.03Fe 65.17 (weight percent) alloys were prepared via different powdering processes, i.e. air classification (AC) and hydrogenation decomposition (HD). Their microstrutures and magnetic properties were investigated. The results show that, HD produces monodispersed fine powders, with which the magnets prepared have uniform microstructure. Moreover, the maximum magnetic energy product, remanence and intrinsic coercivity of the magnets prepared with HD-produced powders are 24.6 kJ·m -3, 0.047 T and 193.4 kA·m -1 higher than those of the magnets prepared with AC-produced powders, and thus the former magnets are better applicable to devices like laser head and magnetron.


Tang J.,China Academy of Engineering Physics | Tang J.,Mianyang Normal University | Zhang L.,China Academy of Engineering Physics | Wei C.,Mianyang Normal University | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2012

The sintered permanent magnets of (PrNd) 33Al 0.7Nb 0.6 Cu 0.1B 1.05Fe bal (wt%) were prepared by the high pressure and conventional molding processes. The performances and microstructure were discussed by metalloscope, VSM, SEM and so on. The results show that the H cj and (BH) max of the samples by high pressure process (1.8 and 3.6 GPa) are much higher (133 kA·m -1 and 0.6 kJ·m -3; 120.3 kA·m -1 and 3.2 kJ·m -3) than those by the conventional pressure process. On the other hand, the former crystalline grains of NdFeB phase are thin and small. In addition, the former Nd-rich phases are homogeneous and reasonable, but too high pressure will decrease Vickers hardness of samples. Copyright © 2012, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Tang J.,CAEP - China Academy of Engineering Physics | Tang J.,Mianyang Normal University | Zhang L.,CAEP - China Academy of Engineering Physics | Wei C.,Mianyang Normal University | And 2 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

The sintered permanent magnets of Nd33Fe65.95B1.05 were prepared via smelting, powdering, forming, sintering and tempering process. The mode and microstructure of the fracture surface were researched by SEM and metallographic microscope. It was showed that the fracture surfaces of the ingot are intergranuler fracture for its big brittleness and there are many Nd-rich phases at fracture surface but Nd2Fe14B phases are relatively integrated. The fracture mode of sintered NdFeB magnets is intergranuler fracture and transgranular fracture because there are lots of defects in magnets, however, their fracture mode is primarily intergranuler fracture. There are two factors accounting to the facture of sintered NdFeB magnets. The extrinsic factor is that there are a good deal of defects, such as holes and impurities. The intrinsic factor is the difference of Vickers hardness of Nd2Fe14B phase and Nd-phase in sintered NdFeB magent. The numerical value of the former Vickers hardness is 6235.94 N·mm-2, but that of the latter Vickers hardness is 5947.42 N·mm-2. To control the fracture of sintered NdFeB magnet, some methods of decreasing holes and impurities are proposed.

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