Abstract
Burner heat type thermal cycle testing machine under axial loading was newly developed in order to evaluate the life of thermal barrier coating (TBC). This test machine is able to load both mechanical stress and thermal stress independently. The outer surface of hollow shape specimen is heated by ring shape gas burner, while inner surface is cooled by the air. When the surface temperature was elevated at 1100℃, the temperature differnce between TBC surface and inner surface was about 200℃. Thermal stress could be loaded by this temperature gradient, which is equivalent to the actual blade with TBC and cooling hole. This testing machine is also able to load axial tensile and axial compression stress that simulates mechanical stress of TBC components. It is concluded that this testing machine is able to simulate the operation conditions, which is high temperature, thermal stress by temperature gradient, and mechanical stress like centrifugal force.
