Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1986-02-21
1987-08-11
Childs, Sadie L.
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
427122, 427249, 427255, B05D 700, C23C 1626
Patent
active
046861165
ABSTRACT:
A method is set forth of chemically vapor depositing a substantially uniform carbonaceous film on to each of a plurality of small refractory particles. Uncoated small refractory particles are intimately intermixed with an organic precursor in liquid or solid form, the intermixing being at a temperature below the sublimation, boiling or decomposition temperature of the precursor. The resulting intimate intermixture is subjected to a temperature of 700.degree. C. to 1200.degree. C. in a deposition zone which is substantially oxygen-free. Residence time in the deposition zone is restricted to be less than that which would deleteriously effect properties of the resulting coated particles. The organic precursor, under the residence time and temperature conditions in the deposition zone, is substantially completely converted by sublimation, boiling and/or decomposition to one or more vaporous species. The organic precursor is selected to either (1) sublime or boil at a temperature in excess of about 400.degree. C. or (2) to not decompose at a temperature below about 300.degree. C. if the organic precursor decomposes at a temperature below its sublimation or boiling temperature, to form the one or more vaporous species. Particles produced by the method are substantially uniformly coated over their entire exposed surfaces and the amount of coating can be closely controlled thereby closely controlling the resulting electrical properties of the coated particles.
REFERENCES:
patent: 3854979 (1974-12-01), Rossi
patent: 3940509 (1976-02-01), Youtsey et al.
patent: 3949106 (1976-04-01), Araki et al.
patent: 3995143 (1976-11-01), Hervert
patent: 4136213 (1979-01-01), Fung et al.
patent: 4533572 (1985-08-01), Neelameggham et al.
patent: 4578313 (1986-03-01), Ito et al.
Rickborn Steven F.
Rogers Donald Z.
Childs Sadie L.
Northrop Corporation
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