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

Sanvac (Beijing) Magnetics Co., Ltd.

Zhian Chen

Boping Hu

Xiaolei Rao

E Niu

Jin Zhang

Wei Zhu

Zhan Wang

Guoan Chen

Yugang Zhao

Jingdong Jia

Fei Du

Xuanzhang Ye

Guoshun Jin

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 sintered neodymium-iron-boron magnet, the main components thereof comprising rare-earth elements R, additional elements T, iron Fe and boron B, and having a rare-earth-enriched phase and a main phase of a Nd2Fe14B crystal structure. The sum of the numerical values of the maximum magnetic energy product (BH)max in units of MGOe and the intrinsic coercive force Hcj in units of kOe is not less than 70. The manufacturing method of the sintered neodymium-iron-boron magnet comprises alloy smelting, powder making, powder mixing, press forming, sintering and heat treatment procedures. By controlling the component formulation and optimizing the process conditions, the sintered neodymium-iron-boron magnet is enabled to simultaneously have a high maximum magnetic energy product and a high intrinsic coercive force.

Nd&#x2014;Fe&#x2014;B sintered magnet and methods for manufacturing the same

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Zhian Chen