Evidence of accelerated thermal cycling test schedules influencing the ranking of zirconia-base thermal barrier coatings

• Thermal barrier coatings (TBCs) often encounter temperature cycling in the course of normal operation. In the absence of actual or simulated engine test facilities, accelerated furnace thermal cycling experiments are frequently devised to evaluate the response of various TBCs. This study, which deals with yttria-stabilized and magnesia-stabilized zirconia systems, shows that the performance of a TBC is significantly governed by the severity of the time-temperature schedule employed. More importantly, the ranking of the two zirconia-base TBCs also is influenced by the adopted thermal cycling test schedule. These findings have ramifications in the design of suitable accelerated tests for TBC evaluation.

Nyckelord

Heat resistance

Magnesia

Nickel alloys

Performance

Thermal cycling

Yttrium compounds

Zirconia

Accelerated tests

Magnesia stabilized zirconia

Thermal barrier coatings

Thermal shock resistance

Time temperature schedule

Yttria-stabilized zirconia

Coatings

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