Compositions – Magnetic – With wax – bitumen – resin – or gum
Reexamination Certificate
2007-04-24
2007-04-24
Sheehan, John P. (Department: 1742)
Compositions
Magnetic
With wax, bitumen, resin, or gum
C252S062540, 15, C420S083000, C420S121000
Reexamination Certificate
active
10381005
ABSTRACT:
An iron-based rare earth alloy nanocomposite magnet has a composition represented by (Fe1-mTm)100-x-y-zQxRyTiz, where T is Co and/or Ni, Q is B and/or C and R is rare earth element(s) including substantially no La or Ce. x, y, z and m satisfy 10 at %<x≦17 at %, 7 at %≦y<10 at %, 0.5 at %≦z≦6 at % and 0≦m≦0.5, respectively. The magnet includes crystal grains of an R2T14Q type compound having an average grain size of 20 nm to 200 nm and a ferromagnetic iron-based boride that exists in a grain boundary between the crystal grains of the R2T14Q type compound. The boride is dispersed in, or present in the form of a film over, the grain boundary to cover at least partially the surface of the crystal grains of the R2T14Q type compound.
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Hirosawa Satoshi
Kanekiyo Hirokazu
Miyoshi Toshio
Keating & Bennett LLP
Neomax Co. Ltd.
Sheehan John P.
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