Mechanical Properties of Double-Layer and Graded Composite Coatings of YSZ Obtained by Atmospheric Plasma Spraying

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• 作者：Pablo Carpio ; Emilio Rayón ; María Dolores Salvador…
• 关键词：adherence ; functionally graded materials ; multilayer coatings ; nanoindentation ; plasma spraying ; thermal barrier coatings
• 刊名：Journal of Thermal Spray Technology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：25
• 期：4
• 页码：778-787
• 全文大小：2,519 KB
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• 作者单位：Pablo Carpio (1) (2)
  Emilio Rayón (1)
  María Dolores Salvador (1)
  Luca Lusvarghi (3)
  Enrique Sánchez (2)
  
  1. Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València, Camino de Vera sn/, 46022, Valencia, Spain
  2. Instituto de Tecnología Cerámica (ITC), Universitat Jaume I, Campus Universitario Riu Sec, Av. Sos Baynat s/n, 12006, Castellón, Spain
  3. Dipartimento di Ingegneria “Enzo Ferrari”, Univeristà degli Studi di Modena e Reggio Emilia, Via Univeristà 4, 41121, Modena, Italy
  
• 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

Double-layer and graded composite coatings of yttria-stabilized zirconia were sprayed on metallic substrates by atmospheric plasma spray. The coating architecture was built up by combining two different feedstocks: one micro- and one nanostructured. Microstructural features and mechanical properties (hardness and elastic modulus) of the coatings were determined by FE-SEM microscopy and nanoindentation technique, respectively. Additional adherence and scratch tests were carried out in order to assess the failure mechanisms occurring between the layers comprising the composites. Microstructural inspection of the coatings confirms the two-zone microstructure. This bimodal microstructure which is exclusive of the layer obtained from the nanostructured feedstock negatively affects the mechanical properties of the whole composite. Nanoindentation tests suitably reproduce the evolution of mechanical properties through coatings thickness on the basis of the position and/or amount of nanostructured feedstock used in the depositing layer. Adhesion and scratch tests show the negative effect on the coating adhesion of layer obtained from the nanostructured feedstock when this layer is deposited on the bond coat. Thus, the poor integrity of this layer results in lower normal stresses required to delaminate the coating in the adhesion test as well as minor critical load registered by using the scratch test.