Preparation of MnBi LTP magnet by direct sintering
AssigneeFord Global Technologies, LLC
InventorWanfeng Li
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Abstract
A method comprising sintering a Mn and Bi powder compact at a first temperature for a first predetermined duration, based on the first temperature, and sintering the compact at a second temperature, less than the first temperature, for a second predetermined duration, greater than the first duration, is disclosed. The sintering at a first temperature for a first predetermined duration generates a predetermined MnBi LTP transition driving force to decrease a formation energy barrier for transition to MnBi LTP. Sintering the compact at the second temperature for the second predetermined duration forms a magnet containing the MnBi LTP.
Claims5
A method of producing a high yield MnBi LTP magnet comprising:
- sintering a Mn and Bi powder compact at a first temperature for a first duration to provide a phase transition driving three for nucleation and growth of MnBi LTP;
- and
- sintering at a second temperature, less than the first duration, for a second duration, greater than the first duration, such that an MnBi LTP x-ray peak intensity is at least twice that of Bi,
- wherein the first temperature is about 660° C. and the first duration is between about 40 and 80 minutes, and the second temperature is about 340° C. and the second duration is about 24 hours.
Dependencies are inferred from the claim text.