Patents by Inventor Weiwei BU

Weiwei BU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • R-Fe-B sintered magnet, preparation method and use thereof
    Patent number: 12784948
    Abstract: An R—Fe—B sintered magnet, and a preparation method therefor and use thereof are provided. The surface of the R—Fe—B sintered magnet has an oxide adhesive layer, and is obtained by means of the heat preservation and heat treatment of an R—Fe—B magnet having a composite diffusion layer on the surface thereof. The heat treatment comprises alternately carrying out a low-temperature heat treatment at 750° C.-830° C. and a high-temperature heat treatment at 830° C.-970° C., and a neodymium iron boron green body having the oxide adhesive layer on the surface thereof is obtained. The grain boundary diffusion of the R—Fe—B magnet is optimized, and the coercive force distribution of the magnet is improved. The R—Fe—B sintered magnet can be used in the field of automobiles, wind power generation, household electric motors, medical apparatuses or mobile communication appliances.
    Type: Grant
    Filed: June 23, 2022
    Date of Patent: November 3, 2026
    Assignees: YANTAI ZHENGHAI MAGNETIC MATERIAL CO., LTD., NANTONG ZHENGHAI MAGNET CO., LTD.
    Inventors: Zhaopu Xu, Dongdong Li, Guodong Su, Weiwei Bu
  • R-FE-B SINTERED MAGNET, PREPARATION METHOD AND USE THEREOF
    Publication number: 20240321489
    Abstract: An R—Fe—B sintered magnet, and a preparation method therefor and use thereof are provided. The surface of the R—Fe—B sintered magnet has an oxide adhesive layer, and is obtained by means of the heat preservation and heat treatment of an R—Fe—B magnet having a composite diffusion layer on the surface thereof. The heat treatment comprises alternately carrying out a low-temperature heat treatment at 750° C.-830° C. and a high-temperature heat treatment at 830° C.-970° C., and a neodymium iron boron green body having the oxide adhesive layer on the surface thereof is obtained. The grain boundary diffusion of the R—Fe—B magnet is optimized, and the coercive force distribution of the magnet is improved. The R—Fe—B sintered magnet can be used in the field of automobiles, wind power generation, household electric motors, medical apparatuses or mobile communication appliances.
    Type: Application
    Filed: June 23, 2022
    Publication date: September 26, 2024
    Inventors: Zhaopu XU, Dongdong LI, Guodong SU, Weiwei BU