Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1979-04-03
1981-02-17
Pianalto, Bernard D.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
427127, 427128, 428469, 428900, B32B 516
Patent
active
042515920
ABSTRACT:
Stabilization treatment of acicular ferromagnetic iron or iron-alloy fine particles against the oxidation thereof comprises the steps of (a) suspending acicular ferromagnetic iron or iron-alloy particles obtained by the reduction of acicular iron oxide which may contain Co or Ni in an aqueous alkaline solution having 0.01 to 18-N of hydroxyl ion concentration at a temperature of 5.degree. to 70.degree. C. while stirring the suspension in a non-oxidative atmosphere therethrough and thereby controlling the dissolution of ferrous ion from the surface of the acicular particles therein, (b) oxidizing the surface of the acicular particles in the resultant suspension by introducing an oxygen containing gas therein at a temperature of 60.degree. to 100.degree. C. to form dense and thin magnetite film on the surface of the acicular particles; and (c) drying the resultant particles in air at a temperature below 100.degree. C.
REFERENCES:
patent: 4066564 (1978-01-01), Sasazawa et al.
patent: 4125474 (1978-11-01), Dezawa et al.
Horiishi Nanao
Matsui Goro
Takedoi Atushi
Toda Koji
Pianalto Bernard D.
Toda Kogyo Corp.
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