Grirem Advanced Materials Co., Ltd.

Grirem Hi-Tech Co., Ltd.

Grirem (Rongcheng) Co., Ltd.

Rare Earth Functional Materials (Xiong'an) Innovation Center Co., Ltd.

Griceon (Rongcheng) Co., Ltd.

Zilong Wang

Yang Luo

Dunbo Yu

Jiajun Xie

Yuanfei Yang

Zhongkai Wang

Zhou Hu

Yifan Liao

Xiao Lin

Wei Zhu

Hongbin Zhang

Wenlong Yan

Haijun Peng

Guiyong Wu

Jichen Jia

Xinyuan Bai

Shengjie Zhu

Kaiwen Wu

An anisotropic bonded magnet and a preparation method thereof are provided. Through a method of stacking magnets which are different in content of SmFeN and/or have different densities, the magnets in the middle have high properties and the magnets at two ends and/or the periphery have low properties, thereby compensating for a property deviation caused by a difference in densities during a pressing process, and improving the property uniformity of the magnets in an axial direction. The method avoids the phenomenon of non-uniform magnetic field orientation and density in a height direction during orientation and densification as well as the phenomenon of low in the middle and high at two ends.

Anisotropic bonded magnet and preparation method thereof

A method for preparing a rare earth anisotropic bonded magnetic powder, comprises the following steps: (1) preparing raw powder with RTBH as the main component, wherein, R is Nd or Pr/Nd, and T is a transition metal containing Fe; (2) adding La hydride or Ce hydride and copper powder to the raw powder to form a mixture; (3) subjecting the mixture to atmosphere diffusion heat treatment to give the rare earth anisotropic bonded magnetic powder.

Preparation method of a rare earth anisotropic bonded magnetic powder

The invention discloses a composite rare earth anisotropic bonded magnet and a preparation method thereof. The composite rare earth anisotropic bonded magnet comprises a Nd—Fe—B magnetic powder, a Sm—Fe—N magnetic powder, a binder and an inorganic nano-dispersant. The preparation method comprises steps of preparing a Nd—Fe—B magnetic powder by a HDDR method, preparing a Sm—Fe—N magnetic powder by a powder metallurgy method, mixing the Nd—Fe—B magnetic powder, the Sm—Fe—N magnetic powder, the binder and the inorganic nano-dispersant at a specific ratio to finally obtain the composite rare earth anisotropic bonded magnet. The invention, by adding an inorganic nano-dispersant, enables the full dispersion of the fine Sm—Fe—N powder during the mixing process of the binder, the Nd—Fe—B magnetic powder and the Sm—Fe—N powder, and thus makes the fine Sm—Fe—N powder and the binder evenly coated on the surface of the anisotropic Nd—Fe—B magnetic powder.

Composite rare earth anisotropic bonded magnet and a preparation method thereof

An anisotropic bonded magnet and a preparation method thereof are provided. By stacking magnets having different magnetic properties and/or densities, the magnets in the middle have high properties and the magnets at two ends and/or the periphery have low properties, thereby compensating for a property deviation caused by a difference in pressing densities during a pressing process, and improving the property uniformity of the magnets in an axial direction. The method solves the problem of 'low in the middle and high at two ends' caused by the phenomenon of non-uniform magnetic field orientation and density along a height direction during orientation and densification.

The present invention relates to an R-T-B sintered magnet and a preparation method thereof. The sintered magnet includes a grain boundary region T, a shell layer region Tand an RFeB grain region T; at 10 &#x3bc;m to 60 &#x3bc;m from a surface of the sintered magnet toward a center thereof, an area ratio of the shell layer region Tto the RFeB grain region Tis 0.1 to 0.3, and a thickness of the shell layer region Tis 0.5 &#x3bc;m to 1.2 &#x3bc;m; and an average coating percent of the shell layer region Ton the RFeB grain region Tis 80% or more. In the present invention, by optimizing a preparation process and a microstructure of a traditional rare earth permanent magnet, diffusion efficiency of heavy rare earth in the magnet is improved, such that coercivity of the magnet is greatly improved, and manufacturing cost is reduced.

R-T-B sintered magnet and preparation method thereof

The present disclosure discloses an yttrium (Y)-added rare-earth permanent magnetic material and a preparation method thereof. A chemical formula of the material expressed in atomic percentage is (YxRE1-x)aFebalMbNc, wherein 0.05&#x2264;x&#x2264;0.4, 7&#x2264;a&#x2264;13, 0&#x2264;b&#x2264;3, 5&#x2264;c&#x2264;20, and the balance is Fe, namely, bal=100-a-b-c; RE represents a rare-earth element Sm, or a combination of the rare-earth element Sm and any one or more elements of Zr, Nd and Pr; M represents Co and/or Nb; and N represents nitrogen. In the preparation method, the rare-earth element Y is utilized to replace the element Sm of a samarium-iron-nitrogen material. By regulating a ratio of the element Sm to the element Y, viscosity of an alloy liquid can be reduced, and an amorphous forming ability of the material is enhanced.

Yttrium-added rare-earth permanent magnetic material and preparation method thereof

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Beijing, China

Zilong Wang