Elastic and anelastic behavior of TBCs sprayed at high deposition rates

0436553 - ÚFP 2015 RIV DE eng C - Conference Paper (international conference)
Valarezo, A. - Dwivedi, G. - Sampath, S. - Mušálek, Radek - Matějíček, Jiří
Elastic and anelastic behavior of TBCs sprayed at high deposition rates.
ITSC 2014 :Interational Thermal Spray Conference and Exposition, Abstracts (including manuscripts on CD-ROM). Düsseldorf: DVS Media GmbH, 2014, s. 13-19. DVS-Berichte, 302. ISBN 978-3-87155-574-9.
[ITSC 2014 :Interational Thermal Spray Conference and Exposition. Barcelona (ES), 21.05.2014-23.05.2014]
R&D Projects: GA ČR(CZ) GPP108/12/P552
Institutional support: RVO:61389021
Keywords : thermal spray * thermal barrier coating * fatigue
Subject RIV: JK - Corrosion ; Surface Treatment of Materials

Coatings sprayed at high deposition rates often result in stiff, dense, and highly stressed coatings. The high deposition temperature at which the coatings are formed is responsible for these characteristics. In this paper, TBCs were sprayed at high deposition rates increasing the tensile quenching stresses beyond the threshold of crack opening during spraying. Dense structures were observed within a pass, in presence of micro and macro defects specifically horizontal cracks within interpasses and vertical segmentation cracks. Mechanical properties, mainly the elastic and anelastic behaviour of TBCs were significantly affected by the strain accommodation and friction occurring within intersplats and interpass interfaces. The strain tolerance obtained in as-sprayed conditions decreased as the microstructure and defects sintered during high temperature heat cycles.The non-linearity degree decreased while the elastic modulus of the various coatings increased to a maximum value.
Permanent Link: http://hdl.handle.net/11104/0240287