Magnetic particle powder of acicular ferric oxide used for magne

Details Magnetic particle powder of acicular ferric oxide used for magne Magnetic particle powder of acicular ferric oxide used for magne

1975-02-26

1977-07-05

Vertiz, O. R.

Compositions

Magnetic

Iron-oxygen compound containing

423634, C01G 4906

Patent

active

040338916

ABSTRACT:
The present invention relates to a process for producing magnetic particle powder of acicular ferric oxide used for a magnetic recording material comprising (A) reducing acicular goethite particle powder to obtain acicular magnetite particle powder, (B) heating said acicular magnetite particle powder and thereby making the partial pressure of oxygen in said acicular magnetite particle powder reach the equilibrium value and (C) oxidizing said acicular magnetite particle powder to obtain gamma-hematite (maghemite) particle powder, and magnetic particle powder produced thereby.

REFERENCES:
patent: 3075919 (1963-01-01), Gruber et al.
patent: 3352638 (1967-11-01), Perlowski et al.
patent: 3382174 (1968-05-01), Hund
patent: 3620841 (1971-11-01), Comstock
patent: 3897354 (1975-07-01), Woditsch et al.
patent: 3912646 (1975-10-01), Leitner et al.
patent: 3974246 (1976-08-01), Chen et al.

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