Coating processes – Magnetic base or coating – Magnetic coating
Patent
1976-08-02
1979-04-17
Pianalto, Bernard D.
Coating processes
Magnetic base or coating
Magnetic coating
427127, 427128, 427132, 427217, 427230, H01F 1004
Patent
active
041501730
ABSTRACT:
Transparent colored materials having low bulk densities and high magnetic permeabilities are obtained by encasing silicaceous particles in a sheath of magnetic or magnetically-attractable metal, which are then heat-treated. The magnetic composite particles are prepared by the solution phase thermal decomposition of transition metal carbonyls in the presence of the silicaceous particles with a suitable suspending medium. Air and moisture are excluded from the reaction vessel and the contents are heated with agitation so that the carbonyl boils and the mixture is refluxed until the temperature rises to that of the suspending medium whereupon coating of the silicaceous particles with elemental metal is complete. The mixture is cooled, the beads washed, air-dried, and recovered. The metal coated particles are then heated in an ambient atmosphere for between about 2 to about 120 minutes at a temperature of from between about 50.degree. C. and 700.degree. C. Particles having transparency, color, and magnetism in the same body are obtained.
REFERENCES:
patent: 3549412 (1970-12-01), Frey et al.
patent: 3770500 (1973-11-01), Imaoka et al.
patent: 4020236 (1977-04-01), Aonuma et al.
Pianalto Bernard D.
Xerox Corporation
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