Processing Parameter Effects and Thermal Properties of Y₂Si₂O₇ Nanostructured Environmental Barrier Coatings Synthesized by Solution Precursor Induction Plasma Spraying

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• 作者：Émilien Darthout ; Guillaume Laduye…
• 关键词：D ; optimal design of experiments ; environmental barrier coatings ; induction thermal plasma ; multilayer thermal conductivity model ; solution precursor plasma spraying (SPPS) process
• 刊名：Journal of Thermal Spray Technology
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：25
• 期：7
• 页码：1264-1279
• 全文大小：1,710 KB
• 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
• 卷排序：25

文摘

The solution precursor plasma spray process, in which a solution of metal salts is axially injected into an induction thermal plasma, is suitable for deposition of nanostructured environmental barrier coatings. The effects of main processing parameters, namely the solution precursor concentration, spraying distance, reactor pressure, and atomization gas flow rate, have been analyzed using D-optimal design of experiments regarding the deposition rate and coating porosity responses. Among these four parameters, the solution precursor concentration had the greatest influent on the coating structure, followed by the spraying distance and reactor pressure, and finally the atomization gas flow rate with a small contribution. It is pointed out that the species that impact on the substrate are agglomerates of nanoparticles. The equivalent thermal conductivity of selected coatings was computed from experimental temperature evolution curves obtained by laser flash thermal diffusivity analysis, using two methods: a multilayer finite-element model with optimization, and a multilayer thermal diffusion model. The results of the two models agree, with coatings exhibiting low thermal conductivity between 0.7 and 1 W/(m K) at 800 °C.