Insulation performance test method of a thermal barrier coating according to the present invention, in the method of the train of the coating layer formed on the parts that operate in the operation environment of high temperature and high pressure waste test performance, to expose the surface of the base metal specimens in the furnace temperature, the other surface is a first step of obtaining a temperature gradient in the thickness direction is exposed to cooling air; The coating surface of the coating layer is a coating layer that is laminated on the metal specimen and the base material exposed to high-temperature electric furnace, the opposite side is a second step of obtaining a temperature gradient in the thickness direction is exposed to cooling air; A third step of using the temperature gradient in the coating the obtained specimen in the second step of calculating the temperature (T _e) of the boundary surface of the outer surface temperature of the coating layer (T _f) with the coating layer; Temperature difference between, and the outer surface temperature of the coating layer (T _f) and temperature (T _e) of the boundary surface of the coating layer (T _△ = T _f - T _e) the fourth step for assessing the insulating performance of the coating layer by; including do.
According to the present invention, the shape of the boundary surface of the coating layer and the base metal, so to take account of the effect of the adhesive coating layer may improve the accuracy and reliability of the thermal barrier performance evaluation.