R-Fe-B based sintered magnet having on the surface thereof vapor deposited film of aluminum or alloy thereof, and method for producing the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 24, 2012
Grant Date -
Nov 25, 2010
app pub date -
May 9, 2008
filing date -
May 9, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An R—Fe—B sinlered magnet having on the surface thereof a vapor deposited film of aluminum or an alloy thereof and a method for producing the same. The vapor deposited film of aluminum or an alloy thereof comprises a columnar crystalline structure grown broader from the surface of the R—Fe—B sintered magnet body outward to the outer surface, which has a part within a region defined in the thickness direction of the film as taken from the surface of the R—Fe—B sintered magnet to ⅓ of the film thickness, 5 to 30 intercrystalline gaps of 0.01 μm to 1 μm in width as counted per 10 μm length in the lateral direction of the film. The method comprises controlling the average film formation rate such that it is slower up to a predetermined point and then is speeded up later thereon.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully