Coating processes – Solid particles or fibers applied – Applying superposed diverse coatings or coating a coated base
Patent
1987-04-27
1988-11-29
Beck, Shrive
Coating processes
Solid particles or fibers applied
Applying superposed diverse coatings or coating a coated base
427202, 427205, 427226, 427221, 427213, 427214, 427215, 427216, B05D 724, B05D 100
Patent
active
047880805
ABSTRACT:
There is disclosed a process for coating particles, such as ceramic, metallic and organic cores, with fine powder, such as ceramic, metal, organic or carbon powder. The process comprises providing a mixture comprising the particles and a binder which is capable of slowly melting to viscous state. Then the mixture is tumbled while slowly heating it to enable the binder to reach the viscous state while allowing the particles to be substantially covered with the binder. The next step includes cooling the mixture to about room temperature and thereafter breaking up the particles that may have agglomerated during the tumbling and heating to give individual particles covered with the binder. As a final step, the fine powder is added to the individual binder covered particles and the mixture is tumbled and heated again to the viscous state under conditions effective to provide a coating of the fine powder on the particles. Additional heating may be carried out to remove the binder and leave particles exclusively coated with the fine powder. The apparatus includes a rotating cylinder, heating and cooling means. The resulting product has a more uniform microstructure and higher bonding strength than a product resulting from a conventional mixing of ingredients.
REFERENCES:
patent: 2871774 (1959-02-01), Johnson
patent: 2890969 (1959-06-01), Schossberger et al.
patent: 2977864 (1961-04-01), Pullar
patent: 3035003 (1962-05-01), Kessler
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patent: 3873346 (1975-03-01), Sweeny
patent: 4493875 (1985-01-01), Beck et al.
patent: 4621024 (1986-11-01), Wright
Champagne Blaise
Dallaire Serge
Hojo Junichi
Beck Shrive
Canadian Patents and Development Limited
Thomson Alan A.
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