Surface nanocrystallization of sintered Nd-Fe-B magnet by HDDR process
نویسندگان
چکیده
منابع مشابه
Coercivity enhancement of Nd-Fe-B sintered magnets by grain boundary modification via reduction-diffusion process
The interface between the Nd2Fe14B particles and the grain boundary surrounding them in Nd-Fe-B sintered magnets was modified by diffusion Dy metal selectively through the grain boundary involving the reduction of Dy2O3 or DyF3 with CaH2 and the coercivity of them was effectively enhanced from 0.98 MA/m to 1.42 MA/m with keeping the high value of remanence. The resultant coercivity was higher t...
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Magnetization of large Nd-Fe-B sintered permanent magnets is still challenging. This type of permanent magnet is electrically conductive, so impulse magnetization causes a flow of eddy currents which prevent magnetization of the whole volume of the magnet. The paper deals with the impulse magnetization of sintered Nd-Fe-B permanent magnets and shows a method for the determination of suitable pa...
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Statistical methods are used to estimate coercivity J Hc and thermal remagnetization of uniaxially nucleationcontrolled permanent magnetic materials. Sintered Nd-Fe-B consists of the tetragonal magnetic Nd2FelrB phase with a volume fraction w = 80 % and of nonmagnetic phases. At temperatures above T, rz 150 K the tetragonal axis is the easy direction of magnetization [I]. It is well known [2] t...
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The surface treatment with Tb-vapor sorption improves the magnetic properties of small-sized magnets. Microstructure of the Tb-treated magnets was investigated by transmission electron microscopy (TEM). By applying the Tb-treatment, the diffusion of Tb through grain boundaries occurred even inside the magnets, and then a thin and continuous wetting-layer phase was formed at the boundaries betwe...
متن کاملKey techniques for ultrahigh performance sintered Nd-Fe-B magnets preparation
Iron boron neodymium alloys are multiphase materials, typically processed slightly rich in Nd and B relative to the primary ferromagnetic phase in the system, Nd2Fe14B. Typically, most magnets contain 20-30 vol. % of nonmagnetic phases which are important for good magnetic properties. Powder metallurgy, melt pinning and mechanical alloying have been used to produce magnets although only the fir...
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ژورنال
عنوان ژورنال: Materials & Design
سال: 2019
ISSN: 0264-1275
DOI: 10.1016/j.matdes.2019.107938