Bilayer Suspension Plasma-Sprayed Thermal Barrier Coatings with Enhanced Thermal Cyclic Lifetime: Experiments and ModelingReportar como inadecuado




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Journal of Thermal Spray Technology

, Volume 26, Issue 6, pp 1038–1051

First Online: 06 July 2017Received: 29 December 2016Revised: 19 May 2017

Abstract

Suspension plasma spraying SPS has been shown as a promising process to produce porous columnar strain tolerant coatings for thermal barrier coatings TBCs in gas turbine engines. However, the highly porous structure is vulnerable to crack propagation, especially near the topcoat-bondcoat interface where high stresses are generated due to thermal cycling. A topcoat layer with high toughness near the topcoat-bondcoat interface could be beneficial to enhance thermal cyclic lifetime of SPS TBCs. In this work, a bilayer coating system consisting of first a dense layer near the topcoat-bondcoat interface followed by a porous columnar layer was fabricated by SPS using Yttria-stabilised zirconia suspension. The objective of this work was to investigate if the bilayer topcoat architecture could enhance the thermal cyclic lifetime of SPS TBCs through experiments and to understand the effect of the column gaps-vertical cracks and the dense layer on the generated stresses in the TBC during thermal cyclic loading through finite element modeling. The experimental results show that the bilayer TBC had significantly higher lifetime than the single-layer TBC. The modeling results show that the dense layer and vertical cracks are beneficial as they reduce the thermally induced stresses which thus increase the lifetime.

Keywordsbilayer coating system finite element modeling lifetime suspension plasma spraying stresses thermal barrier coatings  Download fulltext PDF



Autor: Mohit Gupta - Chamara Kumara - Per Nylén

Fuente: https://link.springer.com/



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