Method of producing acicular magnetic alloy particles

Details Method of producing acicular magnetic alloy particles Method of producing acicular magnetic alloy particles

1996-03-07

1998-04-07

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

75348, H01F 103

Patent

active

057359695

ABSTRACT:
The present invention is a method for making highly stable magnetic alloy particles with high coercivities and high saturation magnetization comprising the steps of:
a) providing a precursor selected from the group consisting of iron oxide hydroxide particles and iron oxide particles, wherein the precursor particle comprises from about 15 to about 45 atomic % Co based on amount of Fe present,
b) reducing the precursor particles to magnetic alloy particles,
c) passivating the magnetic alloy particles in an oxygen-containing atmosphere at a temperature between about 20.degree. and 100.degree. C.,
d) annealing the passivated magnetic alloy particles in an inert atmosphere at a temperature from about 120.degree. to about 450.degree. C., and
e) further oxidizing the annealed magnetic alloy particles in an oxygen-containing atmosphere.

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