HIGH-COERCIVITY NEODYMIUM-CERIUM-IRON-BORON PERMANENT MAGNET AS WELL AS PREPARATION METHOD THEREFOR AND USE THEREOF
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United States of America
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Issued Date -
Mar 20, 2025
app pub date -
Nov 28, 2022
filing date -
Nov 28, 2022
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Abstract
A high-coercivity neodymium-cerium-iron-boron permanent magnet has at least one of the following features: the area of grain boundary RE-rich phases in the magnet accounts for 4% or more of the area of a whole field of view; the grain boundary RE-rich phases in the magnet are fine and uniformly distributed; and the mean value of ratios of the area of block-shaped grain boundary RE-rich phases located at intersections of three or more main-phase grains to the total area of all the three or more adjacent main-phase grains in the vicinity is less than or equal to 30%. RE-rich phases in the magnet are continuously distributed along grain boundaries, thereby increasing the depth of diffusion of a diffusion source into the magnet, improve the uniformity of distribution of the diffusion source in the, and thus further improving the magnetic performance of the diffusion magnet.
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