Powder fluidizing devices and portable powder-deposition apparatus for coating and spray forming
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United States of America Patent
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Apr 6, 2004
Grant Date -
Jan 9, 2003
app pub date -
Jul 3, 2002
filing date -
Jul 9, 2001
priority date (Note) -
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Abstract
The invention relates to a powder-fluidizing and feeding device for use with coating and spray forming nozzles and guns. The device includes novel provisions for controlling and feeding powder from a hopper to a vibrating bowl, for heating and vibrating powders in the hopper to dissipate agglomeration and clumping of the powder, and for metering powders from a vibrating bowl to the spray nozzles and guns using a feedback control derived from powder mass loss rate measurements. The device is particularly useful for feeding ultra-fine and nanoscale particles, which are difficult to feed uniformly with the prior art of conventional powder feeders.
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