Manufacture of acicular ferromagnetic iron particles

Details Manufacture of acicular ferromagnetic iron particles Manufacture of acicular ferromagnetic iron particles

1978-03-20

1979-12-11

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75108, 148105, 252 6256, 252 6263, 423633, B22F 900

Patent

active

041781716

ABSTRACT:
A process for the manufacture of acicular ferromagnetic iron particles by reducing acicular iron(III) oxide hydroxides which consist of pure synthetic lepidocrocite or a mixture of synthetic goethite and at least 70% by weight of synthetic lepidocrocite.
The iron(III) oxide hydroxides used carry, on their surface, an alkaline earth metal cation and an anion of a monobasic, dibasic or tribasic aliphatic carboxylic acid of up to 6 carbon atoms or an organic compound containing at least two groups capable of chelating the alkaline earth metal cation, and are produced in such a way that they consist of at least 70 percent by weight of lepidocrocite and have a length-to-width ratio of not less than 15:1.
Reduction of such iron(III) oxide hydroxides gives iron particles with pronounced shape anisotropy, which exhibit both good magnetic properties and a narrow field strength distribution.

REFERENCES:
patent: 3382174 (1968-05-01), Hund
patent: 3607220 (1971-09-01), van der Giessen et al.
patent: 3904540 (1975-09-01), Bennetch et al.
patent: 3946103 (1976-03-01), Hund
patent: 4017303 (1977-04-01), Koester et al.
patent: 4050962 (1977-09-01), Koester et al.
patent: 4066726 (1977-12-01), Ohlinger et al.

Affiliated with

Also associated with

Rating

Manufacture of acicular ferromagnetic iron particles does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Manufacture of acicular ferromagnetic iron particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manufacture of acicular ferromagnetic iron particles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-309133