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US 8,282,996 B2Granted
Process for extending the cyclic service life of thermal barrier coatings, in particular on gas turbine components
AssigneeALSTOM Technology Ltd
InventorsFrigyes Szuecs, Alexander Stankowski
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Abstract
A process for extending the cyclic service life of thermal barrier coatings made of yttrium-stabilized zirconium oxide (YSZ) or the like which have been applied to a substrate with an oxidizing bond coat in between includes increasing or long-term stabilizing the strain tolerance of the thermal barrier coating.
Claims2
A process for extending the cyclic service life of a thermal barrier coating, which includes microcracks bridged by punctiform contact locations and which is made of chemical thermal barrier coating composition applied to an oxidizing bond coat on a substrate, the process comprising:
- infiltrating the thermal barrier coating by introducing water into pores in the thermal barrier coating by at least one of immersion, spraying, and gas phase infiltration;
- freezing the water in the pores using liquid nitrogen or by dry ice to weaken the punctiform contact locations in the thermal barrier coating, thereby increasing a strain tolerance of the thermal barrier coating in comparison to the strain tolerance of a thermal barrier coating without the steps of infiltrating and freezing;
- and
- removing the water from the pores by drying.
1 more element
Dependencies are inferred from the claim text.