Process for producing co-coated acicular magnetite particles

Details Process for producing co-coated acicular magnetite particles Process for producing co-coated acicular magnetite particles

1996-09-05

1997-07-22

Pianalto, Bernard

Coating processes

Magnetic base or coating

Magnetic coating

427127, 427132, 427214, 427215, 427217, 427404, 4274193, 4274432, B05D 512

Patent

active

056501943

ABSTRACT:
The disclosure describes a process for producing Co-coated acicular magnetite particles each comprising:
acicular magnetite particle as the core particle;
a lower coating layer of Co-containing spinel ferrite having a spinel structure, which is formed on the surface of said acicular magnetite particle; and
an upper coating layer of Co- and Mg-containing spinel ferrite having a spinel structure, which is formed on said lower coating layer.

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patent: 5120604 (1992-06-01), Nakamura
patent: 5151115 (1992-09-01), Tamai
patent: 5183709 (1993-02-01), Schwab et al.
patent: 5188898 (1993-02-01), Tagawa et al.
patent: 5260132 (1993-11-01), Nakazumi et al.
patent: 5294492 (1994-03-01), Oka et al.
patent: 5449565 (1995-09-01), Aoki et al.

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