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US 9,805,850 B2Granted
NdFeB permanent magnet and method for producing the same
AssigneeHyundai Motor Company
InventorsKun Min Park, Jae Ryung Lee, Shin Gyu Kim, Hyung Ju Lee
Life of this patent
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Abstract
A NdFeB permanent magnet is provided and includes Nd of about 25 to 30 wt %, Dy of about 0.5 to 6 wt %, Tb of about 0.2 to 2 wt %, Cu of about 0.1 to 0.5 wt %, B of about 0.8 to 2 wt %, a balance of Fe and other inevitable impurities. In addition, a method for producing the permanent magnet is provided.
Claims7
A method for producing the NdFeB permanent magnet comprising:
- forming a NdFeB stripcasted alloy which comprises neodymium (Nd) of about 25 to 30 wt %, dysprosium (Dy) of about 0.5 to 6 wt %, copper (Cu) of about 0.1 to 0.5 wt %, boron (B) of about 0.8 to 2 wt %, a balance of iron (Fe) and other inevitable impurities;
- finely grinding the NdFeB stripcasted alloy to form a NdFeB stripcasted alloy powder;
- preparing a Tb powder separately from the NdFeB stripcasted alloy powder in the grinding step;
- sintering the NdFeB stripcasted alloy powder and the Tb powder together in a sintering furnace that has an internal pressure where Tb powder does not evaporate;
- and
- heat treating the sintered powders, after adjusting the internal pressure of the sintering furnace so that Tb powder evaporates.
3 more elements
Dependencies are inferred from the claim text.