Coating and compositions
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United States of America Patent
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-
Dec 11, 1990
Issued Date -
N/A
app pub date -
Nov 21, 1989
filing date -
Mar 30, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Workpieces are very rapidly diffusion coated by heating the packed workpieces at a rate that brings the workpieces to diffusion-coating temperature and then completing the diffusion coating, all in less than 50 minutes, then cooling. Workpiece can have top coating layer of aluminum flake covered by a layer of extremely fine alumina or silica in a magnesium chromate binder, to provide surface having roughness at least about 10 micro-inches smoother than before the top coating. Used aluminized jet engine hot section members can be reconditioned by a fluoridizing treatment that deoxidizes and also removes residual aluminizing, so that the members can then be repaired if necessary and re-aluminized.
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