Failure mechanisms and structure tailoring of YSZ and new candidates for thermal barrier coatings: A systematic review

Many factors influence the durability of thermal barrier coatings (TBCs), therefore, in order to tailor these engineering materials for high-temperature applications, it is required to have a comprehensive under-standing of the effects of the contributing factors and their interaction for the development of advanced TBCs. This article gives an overview of the failure mechanisms including sintering, TGO growth, thermal shock, CMAS attack, hot corrosion, erosion, and foreign object damage. Also, the approaches that have been investigated to alleviate the adverse effects of the degradation mechanisms were discussed. In addi-tion to chemical and structural modifications of conventional TBCs, new ceramic materials, such as La2Zr2O7, La2Ce2O7, Gd2Zr2O7, SrZrO3, and LaMgAl11O19, as further candidates for TBC applications were reviewed. These TBC candidate materials have been discussed in terms of their thermal conductivity, thermal expansion coefficients, corrosion resistance characteristics, thermophysical properties, and ther-mal cycling lifetime. (c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This article provides an overview of the factors influencing the durability of thermal barrier coatings and discusses approaches to mitigate the adverse effects of degradation mechanisms. It also reviews new ceramic materials as potential candidates for thermal barrier coating applications, considering their thermal properties and corrosion resistance characteristics.