Sheet metal with an aluminum-containing coating having low emissivity
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United States of America Patent
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-
Mar 27, 2001
Grant Date -
N/A
app pub date -
Oct 3, 1997
filing date -
Oct 10, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A coating layer for sheet metal is provided that is comprised of an aluminum-silicon alloy having low emissivity. The coated sheet metal may be used as heat shield material, particularly for heat sources having temperatures greater than 500.degree. C., which sources may be, e.g., the hotter parts of the conduits of automotive exhaust systems. The sheet metal may be sheet steel coated on at least one of its principal surfaces with a layer of a coating comprised of an alloy of silicon in the amount of 7-11 wt. % and aluminum in the amount of 87-93 wt. %. The coated surface of the sheet has a monochromatic emissivity less than 0.15 for all wavelengths in the range of 1.5-15 microns.
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