METHOD FOR PRODUCING NDFEB SYSTEM SINTERED MAGNET
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United States of America Patent
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Issued Date -
Feb 12, 2015
app pub date -
Oct 17, 2012
filing date -
Oct 27, 2011
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Abandoned
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Abstract
A method for producing a NdFeB system sintered magnet in which a coating material containing a heavy rare-earth element RH applied to a base material of a NdFeB system sintered magnet is inexpensively prevented from adhering to a tray or similar device in a grain boundary diffusion treatment. The method includes the steps of applying a coating material containing a heavy rare-earth element RH to a base material and diffusing the element through grain boundaries in the base material by a grain boundary diffusion method. The coating material is applied to a sheet. The sheet is made to come in tight contact with the base material so that the coating material applied to the sheet contacts an application target surface of the base material. With the sheet held in tight contact with the base material, the grain boundary diffusion treatment (heat treatment) is performed on the base material.
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