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US 11,710,586 B2Granted
Magnetic powder
AssigneeNichia Corporation
InventorsRieko Yoshimoto, Satoshi Yamanaka, Shuichi Tada, Hideaki Yoshiwara
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Abstract
Provided are a SmFeN magnetic powder which is superior not only in water resistance and corrosion resistance but also in hot water resistance, and a method of preparing the powder. The present invention relates to a method of preparing a magnetic powder, comprising: plasma-treating a gas; surface-treating a SmFeN magnetic powder with the plasma-treated gas; and forming a coat layer on the surface of the surface-treated SmFeN magnetic powder.
Claims7
A magnetic powder, comprising:
- a SmFeN magnetic powder;
- a plasma-treated layer formed on a surface of the SmFeN magnetic powder;
- and
- a coat layer formed on a surface of the plasma-treated layer,
- wherein the plasma-treated layer has a thickness that is 5 nm or greater and 300 nm or less.
2 more elements
Dependencies are inferred from the claim text.