ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Turbine vanes and blades are the most intensively loaded elements in that they aresubjected to a large variety of mechanical and high temperature loads. The thermal barrier coatings(TBCs) are widely used on different hot components of gas turbines, as blades and vanes, for both,power engineering as well as aeronautical applications. Currently, two methods are used fordepositing TBCs on substrate, which are plasma spray (PS) and electron beam-physical vapordeposition (EB-PVD). A typical TBCs system consists of two thin coatings, including a ceramiccoating and a metallic bond coat. Despite considerable efforts, the highly desirable prediction of theirlife time is still a demanding task. The PS coating was focused on in this work. Firstly, the TBCssystems are multiplayer material systems. The material properties are not easily determined, such asYoung’s modulus of the top-coating of TBCs. Using the resonant frequency and the composite beamtheory, the Young’s modulus of APS TBCs was gotten under from room temperature to 1150°C. Thenusing a commercial finite-element program, the model geometry is that of a cylinder specimen. Theinterface region between bond coat and top coating is modeled and meshed with a sinusoidalgeometry. The temperature was designed and cycled over a range from room temperature to 1050°C.The force-air-cooling was designed to form temperature gradient across the thickness of TBCs.Finally, the fatigue life of TBCs was predicated. The maximum relative error is 20.1%
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.405.pdf
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