Co-coated acicular magnetite particles and process for producing

Details Co-coated acicular magnetite particles and process for producing Co-coated acicular magnetite particles and process for producing

1995-02-27

1997-05-06

Le, Hoa T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

252 6264, 428404, 428694BA, 428701, 428702, 428900, B32B 516

Patent

active

056269625

ABSTRACT:
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: 4657816 (1987-04-01), Siddiq
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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