Abstract: The thermal shock failure life of thermal barrier coatings (TBCs) was studied. A mathematical model of thermal shock failure and
theoretical calculation formula of the coatings’ thermal shock failure life were established. It is shown that the thermal shock failure mechanism of
coatings is thermal stress fatigue destruction and that the formula accords well with the test results. The critical temperature range Δ T_c
in thermal schok can be used to evaluate the coating’s resistance to thermal cycling. This work provides a theoretical basis for evaluating
the coating’s lifetime and reducing test work.

Key words: thermal barrier coatings, thermal stress, thermal shock failure life, thermal spraying, ceramic coating