Low coefficient of expansion alloys having a thermal barrier
AssigneeInco Limited
InventorsJames A. E. Bell, John J. deBarbadillo
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Abstract
A low coefficient of expansion alloy is coated with a thermal barrier coating having a low coefficient of expansion compatible with the alloy. The alloy, preferably a 900 series iron-base alloy, includes an oxidation resistant intermediate bond coating and a zirconia containing thermal barrier. An article of manufacture made from this material could be utilized in heat engines where close tolerances are mandated.
Claims7
An improved coated article of manufacture having a thermal barrier coating system including a substrate, an intermediate bond coating registered with the substrate, and a thermal barrier coating over the intermediate bond coating, the improvement comprising the substrate made from an iron-nickel containing alloy having a low linear coefficient of expansion of about 10 .mu.m/m/.degree. C. at about 649.degree. C., the linear coefficient of expansion of the iron-nickel containing alloy approximating the linear coefficient of expansion of the thermal barrier coating.
Dependencies are inferred from the claim text.