Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Patent
1981-04-16
1984-04-03
Page, Thurman K.
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
427 26, 427 27, 427213, 427216, 427217, 427220, 4272481, 427250, 427251, B05D 104
Patent
active
044408005
ABSTRACT:
A liquid or powder material can be dispersed by the application of electrostatic fields. The phenomena, referred to as "electrodispersion" is the dispersion by an intense electric field of part of a static bed of liquid or powder into a stable cloud of rapidly moving particles, and the maintenance of a dynamic equilibrium between the static and dispersed phases. The density of the dispersed cloud of particles varies with a number of factors, including the field strength and the nature of the powder. The electrodeposition effect is employed to produce a uniform and durable coating of controlled thickness on the individual particles, by the generation of a vapor of the desired coating--typically a metal or semiconductor material--and allowing the vapor to permeate the dispersed particles. The electric field ensures that only the particles are coated, and the dispersed particles, having the same charge, repel each other, avoiding agglomeration. Potential applications include the manufacture of high performance catalysts wherein expensive metals like platinum are vapor-coated onto an inexpensive metal powder. Other possibilities include the production of graphite-coated metal particles for making self-lubricating metal components such as bearings and shafts, and the manufacture of slow dissolving coatings on pharmaceutical powders.
REFERENCES:
patent: 3670699 (1972-06-01), Sargent
patent: 3978269 (1976-08-01), Martin
patent: 4150905 (1979-04-01), Kaplan et al.
patent: 4209550 (1980-06-01), Hagenbach et al.
patent: 4233365 (1980-11-01), Karg
patent: 4233387 (1980-11-01), Mammino et al.
Morton David H.
Potter Edmund C.
Szirmai Stephen G.
Commonwealth Scientific and Industrial Research
Lavine Irvin A.
Page Thurman K.
Unisearch Limited
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