Elastic and Anelastic Behavior of TBCs Sprayed at High-Deposition Rates

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• 作者：A. Valarezo (1) (2)
  G. Dwivedi (1)
  S. Sampath (1)
  R. Musalek (3)
  J. Matejicek (3)
  
  1. Center for Thermal Spray Research ; Stony Brook University ; Stony Brook ; USA
  2. Department of Mechanical Engineering ; Universidad San Francisco de Quito ; Quito ; Ecuador
  3. Department of Materials Engineering ; Institute of Plasma Physics ; Prague ; Czech Republic
  
• 关键词：dense vertically cracked coating ; elastic modulus ; in ; situ monitoring ; mechanical properties ; quenching stress ; thermal barrier coatings (TBCs) ; triplex system
• 刊名：Journal of Thermal Spray Technology
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：24
• 期：1-2
• 页码：160-167
• 全文大小：1,158 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Surfaces and Interfaces and Thin Films
  Tribology, Corrosion and Coatings
  Materials Science
  Characterization and Evaluation Materials
  Operating Procedures and Materials Treatment
  Analytical Chemistry
  
• 出版者：Springer Boston
• ISSN：1544-1016

文摘

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.