NdFeB magnets aligned in a 9-T superconducting solenoid.

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Commercial-grade magnet powder (Magnequench UG) was uniaxial die-pressed into cylindrical compacts, while being aligned in the 1-T to 8-T DC field of a superconducting solenoid at Argonne National Laboratory. Then, the compacts were added to normal Magnequench UG production batches for sintering and annealing. The variations in magnet properties for different strengths of alignment fields are reported for 15.88-mm (5/8-in.) diameter compacts made with length-to-diameter (L/D) ratios in the range {ge} 0.25 and {le} 1. The best magnets were produced when the powder-filled die was inserted into the active field of the solenoid and then pressed. Improvements in the residual ... continued below

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Mulcahy, T. M.; Hull, J. R.; Rozendaal, E. & Wise, J. H. May 8, 2002.

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Commercial-grade magnet powder (Magnequench UG) was uniaxial die-pressed into cylindrical compacts, while being aligned in the 1-T to 8-T DC field of a superconducting solenoid at Argonne National Laboratory. Then, the compacts were added to normal Magnequench UG production batches for sintering and annealing. The variations in magnet properties for different strengths of alignment fields are reported for 15.88-mm (5/8-in.) diameter compacts made with length-to-diameter (L/D) ratios in the range {ge} 0.25 and {le} 1. The best magnets were produced when the powder-filled die was inserted into the active field of the solenoid and then pressed. Improvements in the residual flux density of 8% and in the energy product of 16% were achieved by increasing the alignment field beyond the typical 2-T capabilities of electromagnets. The most improvement was achieved for the compacts with the smallest L/D ratio. The ability to make very strong magnets with small L/D, where self-demagnetization effects during alignment are greatest, would benefit most the production of near-final-shape magnets. Compaction of the magnet powder using a horizontal die and a continuously active superconducting solenoid was not a problem. Although the press was operated in the batch mode for this proof-of-concept study, its design is intended to enable automated production.

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  • 17th International Workshop on Rare Earth Magnets and Their Applications, Newark, DE (US), 08/18/2002--08/22/2002

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  • Report No.: ANL/ET/CP-106756
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 799841
  • Archival Resource Key: ark:/67531/metadc735205

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  • May 8, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 22, 2016, 9:23 p.m.

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Mulcahy, T. M.; Hull, J. R.; Rozendaal, E. & Wise, J. H. NdFeB magnets aligned in a 9-T superconducting solenoid., article, May 8, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc735205/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.