Abstract
Thermal barrier coatings (TBCs) are the indispensable technology for hot-section components of an advanced industrial gas turbine. A TBC consists of a metallic bond-coat (BC) and a ceramic top-coat (TC) on a superalloy substrate. The reliable data of various properties on the coatings have been required to design the superior TBC. Especially, the Young's moduli of the BC and the TC are important mechanical properties to evaluate mechanical and thermal stresses. In the present study, the Young's moduli of TBCs were measured using the flexural resonance method. Several kinds of TBC specimens were made by plasma sprayings with different conditions. The Young's modulus was determined according to a new analytical approach proposed for a multi-layer model. It was confirmed that this approach can obtain reliable data of the Young's modulus and is very effective for the TBC. Furthermore, the Young's modulus of the TC was found to be strongly dependent on its microstructure. The TC with the higher porosity and microcracks between splats exhibits the low Young's modulus.
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