The Young's modulus (* 1) measurement method for thermal barrier coatings proposed by Tokyo Metropolitan University and Osaka Science and Technology Center was established as the international standard ISO19477.This method is very simple and will help in the design and development of heat shield coatings with excellent durability and reliability.
According to Tokyo Metropolitan University, thermal barrier coating is the main technology that supports the high temperature part of gas turbines in thermal power plants, and Young's modulus is used to evaluate thermal stress and mechanical adaptability that strongly affect the durability of thermal shield coating. It will be important.
This method, which was launched by Tokyo Metropolitan University and others, can measure the Young's modulus of the thermal barrier coating at room temperature in a 4-point bending test using a multi-layer test piece with a thermal barrier coating coated on the substrate.As for the method of measuring Young's modulus, a standard has already been established for ceramics alone, but since the thermal barrier coating is used by coating it on a metal substrate, it is rational to measure it by the conventional method. There wasn't.
Since the Great East Japan Earthquake, Japan's dependence on thermal power generation has increased sharply, and it has become dependent on about 9% of domestic electricity demand.As gas turbines are being operated at high temperatures with the aim of reducing carbon dioxide emissions and costs, thermal barrier coatings that protect the substrate from combustion gas are required to be more durable and reliable than ever before. ..
* 1 Young's modulus A constant of proportionality between strain and stress in the coaxial direction in the elastic range where Hooke's law holds, also called the longitudinal elastic modulus.
