“Testing Method for Thermal Cycle and Thermal Shock Resistance of Thermal Barrier Coating (TBC)” is a Japanese Industrial Standard (JIS) newly established by the Minister of Economy, Trade, and Industry in 2008, after deliberations by Japanese Industrial Standards Committee, in accordance with the Industrial Standardization Law. The standard specifies a testing method that evaluates the spalling resistance of TBCs based on operating conditions in gas turbines. This paper provides an overview of the standard along with examples of its use.

The evaluation of residual stress distributions of a thermal sprayed plate is an important problem from the viewpoint of preventing the cracking and/or delamination of coatings. Though the well-known method for estimating the residual stress has been widely used based on Stoney’s type equations, the accuracy of estimation has not always been made clear. In this paper, accurate estimation of residual stresses of coated components using finite element analysis was implemented and polynomial expression of the relationship between residual stress and deflection is proposed. It was confirmed that the residual stress estimated by the newly proposed equation was in good agreement with the experimental results measured by X-ray diffraction method in case of a CoNiCrAlY coating applied on an IN738LC substrate using plasma spraying in air atmosphere.

“Testing Method for Heat Resistance under Temperature Gradient” is a Japanese Industrial Standard (JIS) newly established by the Minister of Economy, Trade and Industry, after deliberations by the Japanese Industrial Standards Committee, in accordance with the Industrial Standardization Law. This standard specified the testing method for heat resistance under temperature gradient of materials and coated members of equipment exposed to high temperature, such as aircraft engines, gas turbines, reciprocating engines, accelerators, power switchgears etc. Three kinds of testing method, such as burner heating test, arc heating test and various beam heating tests are involved.