A Review on Thermal Barrier Coatings

Omran, Khaled; Ahmed, Mona Sayed; Elmeniawi, Mohamed; Sallam, Hossam; Naga, Salma

doi:10.21608/eijest.2021.79363.1070

A Review on Thermal Barrier Coatings

Document Type : Original Article

Authors

¹ Zagazig University, Faculty of Engineering, Materials Engineering Dept, 44519 - Zagazig, Egypt

² National Research Center, Ceramics Dept, El-Bohous Str., 12622 - Cairo, Egypt

³ Faculty of Engineering, Zagazig University, Zagazig, Egypt

10.21608/eijest.2021.79363.1070

Abstract

To protect the hot parts of the engine turbines, thermal barrier coatings (TBCs) are exceedingly applied. TBC decrease the temperature of the turbines during operation and hence enhanced the engine performance. Recently, researchers have concentrated on developing and processing TBCs for turbine parts. Promote the thermal barrier coatings will authorize the gas turbines to serve at elevated temperatures. TBCs mostly consists of 2 layers, the bond coat, and the topcoat. The top-coat is mainly composed of ceramic materials that possess low thermal conductivity properties and its main job is to protect the metallic parts from high temperatures.
Apparent attempts are being carried out to figure new materials having beneficial fulfillments. To defeat the yttria partially stabilized zirconia (YSZ) troubles, pyrochlore rare-earth zirconate ceramics (A2B2O7) have been suggested as most of them are refractory and thermally stable. Hexaaluminates are another suggestion that meets the current requirements of TBCs.
The present review summarizes and reviews the novel advance of the materials suitable for Thermal Barrier Coatings, their selection criteria, and their processing techniques.

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