Patents by Inventor XIAOFEI YI

XIAOFEI YI 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).

  • Short-process method for preparing sintered NdFeB magnets with high magnetic properties recycling from NdFeB sludge
    Patent number: 9728310
    Abstract: The present invention discloses a short process preparation technology of sintered NdFeB magnets from the NdFeB sludge, which relates to a field of recycle technology of NdFeB sludge. The present invention comprises the following steps: water bath distillation of organics in sludge, ultrasonic cleaning, calcium reduction and diffusion, ultrasonic rinsing in a magnetic field and drying, powders mixing and sintering. NdFeB sludge as raw materials was directly prepared from recycled sintered magnets with high magnetic properties. Most of the organics in the sludge could be removed by a vacuum distillation process with stepwise heating. The ultrasonic rinsing process in a magnetic field could effectively remove the remaining organics. The recycled sintered magnets exhibited good maximum energy product [(BH)max] of 35.26 MGOe. The present invention has important features, such as the short processing time, efficient environmental protection, high recycling rate and effective utilization rate of rare earth metals.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: August 8, 2017
    Assignees: BEIJING UNIVERSITY OF TECHNOLOGY, ANHUI EARTH-PANDA ADVANCE MAGNETIC MATERIAL CO., LTD.
    Inventors: Ming Yue, Weiqiang Liu, Xiantao Li, Meng Li, Min Liu, Dongtao Zhang, Xiaowen Yin, Xiulian Huang, Jingwu Chen, Xiaofei Yi
  • SHORT-PROCESS METHOD FOR PREPARING SINTERED NDFEB MAGNETS WITH HIGH MAGNETIC PROPERTIES RECYCLING FROM NDFEB SLUDGE
    Publication number: 20160260530
    Abstract: The present invention discloses a short process preparation technology of sintered NdFeB magnets from the NdFeB sludge, which relates to a field of recycle technology of NdFeB sludge. The present invention comprises the following steps: water bath distillation of organics in sludge, ultrasonic cleaning, calcium reduction and diffusion, ultrasonic rinsing in a magnetic field and drying, powders mixing and sintering. NdFeB sludge as raw materials was directly prepared from recycled sintered magnets with high magnetic properties. Most of the organics in the sludge could be removed by a vacuum distillation process with stepwise heating. The ultrasonic rinsing process in a magnetic field could effectively remove the remaining organics. The recycled sintered magnets exhibited good maximum energy product [(BH)max] of 35.26 MGOe. The present invention has important features, such as the short processing time, efficient environmental protection, high recycling rate and effective utilization rate of rare earth metals.
    Type: Application
    Filed: April 19, 2016
    Publication date: September 8, 2016
    Inventors: MING YUE, WEIQIANG LIU, XIANTAO LI, MENG LI, MIN LIU, DONGTAO ZHANG, XIAOWEN YIN, XIULIAN HUANG, JINGWU CHEN, XIAOFEI YI