Thermal barrier coating system having no bond coat
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United States of America Patent
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Jul 23, 1996
Grant Date -
N/A
app pub date -
Oct 13, 1992
filing date -
Oct 13, 1992
priority date (Note) -
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Abstract
A coated article is prepared by melting and casting an article substrate formed of a nickel-base superalloy. The article substrate is heated in a hydrogen-containing atmosphere at a temperature of at least 2000.degree. F. for a period sufficient to desulfurize the substrate to a sulfur content of less than about 1 part per million. Optionally, an aluminum-oxide environmental coating is provided overlying the substrate. A ceramic thermal barrier coating is applied overlying the substrate. Significantly, there being no bond coat applied to the substrate prior to the application of the thermal barrier coating.
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