Elastic and anelastic behavior of TBCs sprayed at high-deposition rates

0456064 - ÚFP 2016 RIV US eng J - Journal Article
Valarezo, A. - Dwivedi, G. - Sampath, S. - Mušálek, Radek - Matějíček, Jiří
Elastic and anelastic behavior of TBCs sprayed at high-deposition rates.
Journal of Thermal Spray Technology. Roč. 24, 1-2 (2015), s. 160-167. ISSN 1059-9630. E-ISSN 1544-1016
R&D Projects: GA MŠMT ME 901; GA ČR(CZ) GPP108/12/P552
Institutional support: RVO:61389021
Keywords : dense vertically cracked coating * elastic modulus * in-situ monitoring * mechanical properties * quenching stress * thermal barrier coatings (TBCs) * triplex system
Subject RIV: JK - Corrosion ; Surface Treatment of Materials
Impact factor: 1.568, year: 2015
http://link.springer.com/article/10.1007%2Fs11666-014-0154-6

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 the presence of micro and macro defects specifically horizontal cracks within interpasses and vertical segmentation cracks. Mechanical properties, mainly the elastic and anelastic behavior 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/11104/0256635