Novel process for making small bulk magnets

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 MH loops of the processed thin magnet (in plane)

MH loops of the processed thin magnet (in plane)

CMI researchers at Ames Laboratory conducted the research for this highlight

Achievement
A novel bulk magnet fabrication process has been developed. Using hot-rolling processing, a thin bulk magnet with 37 MGOe at RT has been achieved, a significant improvement from 33 MGOe results reported six months ago.

Significance and impact
This manufacturing method was specifically developed for making small magnets: (1) simplified processing steps reduces the cost; (2) innovative use of copper deformable die enhance corrosion and magnetic properties; (3) the near-net-shape cross-section reduce part-failure rate and rare earth waste.

Next steps

  • Design new composition to enhance texture.
  • Scale-up for semi-continuous process
(Left): Before process, powder packed in a copper tube; (Right): After process, thin bulk magnet enveloped by a copper shell providing mechanical support and corrosion protection.
(Left): Before process, powder packed in a copper tube;
(Right): After process, thin bulk magnet enveloped by a copper shell providing mechanical support and corrosion protection.