Grain Boundary Diffusion Process For Rare-Earth Magnets

摘要

In at least one embodiment, a single sintered magnet is provided having a concentration profile of heavy rare-earth (HRE) elements within a continuously sintered rare-earth (RE) magnet bulk. The concentration profile may include at least one local maximum of HRE element concentration within the bulk such that a coercivity profile of the magnet has at least one local maximum within the bulk. The magnet may be formed by introducing alternating layers of an HRE containing material and a magnetic powder into a mold, pressing the layers into a green compact, and sintering the green compact to form a single, unitary magnet.

主权项

1. A magnet comprising:
a single sintered magnet having a concentration profile of heavy rare-earth (HRE) elements within a continuously sintered rare-earth (RE) magnet bulk; wherein the concentration profile includes at least one local maximum of HRE element concentration located between local minimums of the HRE element concentration within the bulk such that a corresponding coercivity profile of the magnet has at least one local maximum located between local minimums within the bulk.