ARTICLES HAVING DAMAGE-TOLERANT THERMAL BARRIER COATING
First Claim
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1. An article comprising:
- a plurality of coating layers disposed over a substrate, the plurality comprising an inner layer and an outer layer, whereina) the outer layer is more resistant to infiltration by nominal CMAS relative to 8 weight percent yttria-stabilized zirconia at a temperature of 1300 degrees Celsius; and
b) the inner layer has, in a temperature range from about 1000 degrees Celsius to about 1200 degrees Celsius, a thermal resistance in a range from about 9×
10−
5 degree Kelvin per watt to about 23×
10−
5 degree Kelvin per watt.
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Abstract
An article having a damage-tolerant thermal barrier coating includes a plurality of coating layers disposed over a substrate. The plurality of coatings comprises an inner layer and an outer layer. The outer layer is more resistant to infiltration by nominal CMAS relative to 8 weight percent yttria-stabilized zirconia at a temperature of 1300 degrees Celsius. The inner layer has, in a temperature range from about 1000 degrees Celsius to about 1200 degrees Celsius, a thermal resistance in a range from about 9×10−5 degree Kelvin per watt to about 23×10−5 degree Kelvin per watt.
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Citations
17 Claims
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1. An article comprising:
a plurality of coating layers disposed over a substrate, the plurality comprising an inner layer and an outer layer, wherein a) the outer layer is more resistant to infiltration by nominal CMAS relative to 8 weight percent yttria-stabilized zirconia at a temperature of 1300 degrees Celsius; and b) the inner layer has, in a temperature range from about 1000 degrees Celsius to about 1200 degrees Celsius, a thermal resistance in a range from about 9×
10−
5 degree Kelvin per watt to about 23×
10−
5 degree Kelvin per watt.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An article comprising:
a plurality of coating layers disposed over a substrate, the plurality comprising an inner layer and an outer layer, wherein the inner layer comprises yttria-stabilized zirconia and has a thickness from about 200 micrometers to about 300 micrometers; and the outer layer comprises a material more resistant to infiltration by nominal CMAS relative to 8 weight percent yttria-stabilized zirconia at a temperature of 1300 degrees Celsius.
Specification