Rare earth cobalt-based permanent magnet
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United States of America Patent
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Jul 5, 2022
Grant Date -
Jul 30, 2020
app pub date -
Oct 7, 2016
filing date -
Oct 8, 2015
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Abstract
A rare-earth cobalt permanent magnet with good magnetic properties is provided. A rare-earth cobalt permanent magnet contains 23 to 27 mass % R, 3.5 to 5.0 mass % Cu, 18 to 25 mass % Fe, 1.5 to 3.0 mass % Zr in mass and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. The rare-earth cobalt permanent magnet has a metal structure including a plurality of crystal grains and a continuously extending grain boundary. A content of Cu in the grain boundary is higher than a content of Cu in the crystal grains, and a content of Zr in the grain boundary is higher than a content of Zr in the crystal grains.
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