Novel process for making small bulk magnets

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.