Ferrite sintered magnet

Details Ferrite sintered magnet Ferrite sintered magnet

2011-03-15

2011-03-15

Mayes, Melvin C (Department: 1732)

Compositions

Magnetic

Iron-oxygen compound containing

C252S06251C, C252S062560, C252S062570, C252S062620

Reexamination Certificate

active

07906036

ABSTRACT:
A sintered ferrite magnet having a basic composition represented by the general formula: A1−x−y+aCax+bRy+cFe2n−zCoz+dO19(atomic ratio), wherein a, b, c and d represent the amounts of an A element, Ca, an R element and Co added in the pulverization step of an oxide magnet material, which are numerals meeting the conditions of 0.03≦x≦0.4, 0.1≦y≦0.6, 0≦z≦0.4, 4≦n≦10, x+y<1, 0.03≦x+b≦0.4, 0.1≦y+c≦0.6, 0.1≦z+d≦0.4, 0.50≦[(1−x−y+a)/(1−y+a+b)]≦0.97, 1.1≦(y+c)/(z+d)≦1.8, 1.0≦(y+c)/x≦20, and 0.1≦x/(z+d)≦1.2.

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Chikazumi Soushin, Physics of Strong Magnetic Substances (First Book)—Magnetic Properties of Substances--, pp. 18-27 Published by SHOKABO Publishing Co. in 1978.
Third Party Observation (European Communication) dated Dec. 11, 2008.

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