Sintering characteristics of plasma-sprayed TBCs: Experimental analysis and an overall modelling. Issue 3 (15th February 2018)

• Record Type: Journal Article
• Authors: Li, Guang-Rong; Yang, Guan-Jun; Li, Cheng-Xin; Li, Chang-Jiu
• Is Part Of: Ceramics international. Volume 44:Issue 3(2018)
• Page Start: 2982
• Page End: 2990
• Publication Date: 2018-02-15
• Subjects: Thermal barrier coatings (TBCs) -- Plasma spray -- Sintering -- Stage-sensitive kinetics -- Structural tailoring; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.11.052
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, sintering behaviour of plasma-sprayed thermal barrier coatings (PS-TBCs) was investigated experimentally and theoretically. Results show that the sintering kinetics of PS-TBCs is highly stage-sensitive. The sintering proceeds significantly faster at initial short thermal exposure (<20 h), while it slows down dramatically at following long thermal exposure. A detailed examination on microstructural evolution of the PS-TBCs was carried out to understand their sintering behaviour. Results show that, different from the conventional sintering theory, the healing of 2D pores was dominantly responsible for the stage-sensitive sintering kinetics during thermal exposure. In brief, the sintering characteristics of the PS-TBCs are highly structure specific. In addition, a structural model was developed based on the structural characteristics of the PS-TBCs; and the model predicts a well consistent sintering behaviour with experiments. Finally, an outlook towards TBCs with higher performance was put forward.