Precise regulation of fluidized bed weight in pyrolytically coating substrates
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United States of America Patent
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Jul 12, 1994
Grant Date -
N/A
app pub date -
Mar 16, 1993
filing date -
Mar 16, 1993
priority date (Note) -
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Abstract
Precise control of pyrocarbon being coated upon an object in a fluidized particle bed is achieved by monitoring the weight change of the fluidized particle bed over a period of time. Measurement of such weight change is truly representative of bed size in such a coater, which is a most important factor in achieving the desired characteristics of the pyrocarbon being deposited. By monitoring the bed size by repeatedly determining such changes in the weight, compensating adjustments are made by either adding additional particles to the bed or by changing the rate at which particles are withdrawn so that precise coating characteristics are achieved, and coatings can be deposited within very close thickness tolerances.
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