Beijing Zhong Ke San Huan Hi-tech Co., Ltd.

Sanvac (beijing) Magnetics Co., Ltd.

Fei Du

Zhan Wang

Wei Zhu

Boping Hu

Xiaolei Rao

Yugang Zhao

E Niu

Bin Fang

Haojie Wang

Guoan Chen

Zhian Chen

Xuanzhang Ye

An alloy cast strip preparation method includes a melting process and a casting cooling process. The melting process includes controlling a power of an induction melting furnace to perform a cyclic heat treatment to completely melt an alloy raw material before a surface temperature of a melt obtained by melting the alloy raw material is raised to 1300° C., and, after the alloy raw material is melted, adjusting the power of the induction melting furnace to stabilize the surface temperature of the melt at a temperature in a range from 1400° C. to 1500° C. The casting cooling process includes performing casting cooling on the melt arranged on a surface of a rotary cooling roll to obtain an alloy cast strip while controlling a surface linear velocity of the rotary cooling roll to be from 1.5 m/s to 2.25 m/s.

Fine grain rare earth alloy cast strip, preparation method thereof, and a rotary cooling roll device

A NdFeB rare earth magnet includes a main phase and a grain boundary phase including a white grain boundary phase and a gray grain boundary phase. In a microstructure observation area of the rare earth magnet, an area of the white grain accounts for 1˜3% of a total area of the microstructure observation area, and an area of the gray grain boundary phase accounts for 2˜10% of the total area of the microstructure observation area.

Rare earth magnet and preparation method thereof

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Beijing, China

Fei Du