Method of producing R-T-B sintered magnet
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United States of America Patent
Stats
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Nov 1, 2016
Grant Date -
Nov 14, 2013
app pub date -
Jan 19, 2012
filing date -
Jan 19, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for producing a sintered R-T-B based magnet includes providing at least one sintered R-T-B based magnet material (where R is a rare-earth element and T is Fe or Fe and Co); providing RH diffusion sources that include a heavy rare-earth element RH (which is Dy and/or Tb) and 30 to 80 mass % of Fe and that have a particle size between 53 μm and 5600 μm; arranging the magnet material and the RH diffusion sources in a process vessel so that some of the RH diffusion sources are in contact with the magnet material; performing an RH diffusion process by heat treating in an inert ambient at a pressure of 5000 Pa or less and at a temperature of 800° C. to 1000° C.; and separating the RH diffusion sources from the magnet material.
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International Classification(s)
- 2012 Application Filing Year
- B22F Class
- 463 Applications Filed
- 400 Patents Issued To-Date
- 86.40 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- B22F Class
- 0 % this patent is cited more than
- 9 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 1, 2028 |
