Analytical solution of quenching-induced deposition stress in functionally graded thermal barrier coatings. Issue 9 (15th June 2019)

• Record Type: Journal Article
• Authors: Ai, Song; Song, Yan; Yang, Bin; Han, Zelin; Wang, T.J.
• Is Part Of: Ceramics international. Volume 45:Issue 9(2019)
• Page Start: 12372
• Page End: 12381
• Publication Date: 2019-06-15
• Subjects: TBCs -- FG-TBCs -- Quenching stress -- Deposition stress; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.03.163
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Deposition stress caused by quenching of splats in the deposition process of Functionally Graded Thermal Barrier Coatings (FG-TBCs) has a profound influence on its residual thermal stress. In this work, according to the progressive thermal spray process of FG-TBCs, a theoretical solution is developed for predicting deposition stress caused by quenching of splats in the deposition process of FG-TBCs. The verification of this theoretical solution has been done by reduceing to Tsui and Clyne's model. The deposition stress filed evolution and the total/final deposition stresses during the deposition process of FG-TBCs have been studied, and stress concentrations in FG-TBCs and conventional TBCs have been compared. Meanwhile, the effect of some geometric parameters, such as the thickness of Functionally Graded Coating (FGC) and the substrate, has also been discussed. The results show that, compared with the deposition stress arisen in conventional TBCs, the deposition stress concentration in the FG-TBCs has been significantly reduced; the magnitudes of deposition stresses are the same at the top surface of FGC; however, they decrease at the bottom with the FGC thickness increasing; the magnitudes of the deposition stresses in the FGC decrease with the decrease of substrate thickness. This work may provide further insights into the development and optimization of more efficient FG-TBCs for industrial applications.