Table of Content

Recent Trends in Thermal Barrier Coatings for Turbine Blades: Theory, Simulation, and Experiment

Submission Deadline: 31 December 2022 Submit to Special Issue

Guest Editors

Prof. Xueling Fan, Xi’an Jiaotong University, China
Dr. Tao Zhang, AEEC Sichuan Gas Turbine Establishment, China
Dr. Fulei Jing, Aero Engine Academy of China, Aero Engine Corporation of China

Summary

The development of advanced aero engines is linked with increasing turbine inlet temperature, which results in harsher operating environment for turbine blades. The turbine inlet temperature has reached approximate 2000 K, far exceeding the work temperature limit (~1400 K) of nickel-based superalloys that provide load bearing capacity for the turbine blades. To maintain adequate strength and achieve required lifetime, modern turbine blades are composed of nickel-based single crystal superalloy as substrate in combination with thermal barrier coating (TBC) and complex cooling system. TBC provides protection from the harsh environment and prolongs the component life. However, the application of TBC brings new challenges. The TBC is subjected to both external loads (e.g., high temperature, time-varying gas environment, and mechanical load transferred from the blade substrate through deformation) and internal loads (e.g., stress caused by the mismatch of thermal expansion of each layer, and the TGO growth). As a consequence of the TBC potential spallation caused by the loads, the nickel-based superalloy substrate would be exposed to the aggressive operating conditions exceeding its damage resistance limit, which could result in the overheat and fracture of turbine blades. Therefore, the evaluation of the TBC’s durability has become a critical issue limiting the application of TBC in turbine blades. Recently the TBC-related materials and processes have gained remarkable advance, which require better knowledge and understanding of the mechanics behavior, failure mechanisms and durability-determined life of TBC. It is hoped that this special issue could contribute to facilitating the communication and dissemination of the recent development of strength theory, numerical methods, and experimental techniques for TBC, thereby promoting the improvement and applications of TBC in advanced turbines


Keywords

Turbine Blade, High Temperature, Thermal Barrier Coating (TBC), Failure, Life Prediction

Published Papers


  • Open Access

    ARTICLE

    Quantifying Solid Solution Strengthening in Nickel-Based Superalloys via High-Throughput Experiment and Machine Learning

    Zihang Li, Zexin Wang, Zi Wang, Zijun Qin, Feng Liu, Liming Tan, Xiaochao Jin, Xueling Fan, Lan Huang
    CMES-Computer Modeling in Engineering & Sciences, Vol.135, No.2, pp. 1521-1538, 2023, DOI:10.32604/cmes.2022.021639
    (This article belongs to this Special Issue: Recent Trends in Thermal Barrier Coatings for Turbine Blades: Theory, Simulation, and Experiment)
    Abstract Solid solution strengthening (SSS) is one of the main contributions to the desired tensile properties of nickel-based superalloys for turbine blades and disks. The value of SSS can be calculated by using Fleischer’s and Labusch’s theories, while the model parameters are incorporated without fitting to experimental data of complex alloys. In this work, four diffusion multiples consisting of multicomponent alloys and pure Ni are prepared and characterized. The composition and microhardness of single γ phase regions in samples are used to quantify the SSS. Then, Fleischer’s and Labusch’s theories are examined based on high-throughput experiments, respectively. The fitted solid solution… More >

  • Open Access

    ARTICLE

    Thermal Analysis of Turbine Blades with Thermal Barrier Coatings Using Virtual Wall Thickness Method

    Linchuan Liu, Jian Wu, Zhongwei Hu, Xiaochao Jin, Pin Lu, Tao Zhang, Xueling Fan
    CMES-Computer Modeling in Engineering & Sciences, Vol.134, No.2, pp. 1219-1236, 2023, DOI:10.32604/cmes.2022.022221
    (This article belongs to this Special Issue: Recent Trends in Thermal Barrier Coatings for Turbine Blades: Theory, Simulation, and Experiment)
    Abstract A virtual wall thickness method is developed to simulate the temperature field of turbine blades with thermal barrier coatings (TBCs), to simplify the modeling process and improve the calculation efficiency. The results show that the virtual wall thickness method can improve the mesh quality by 20%, reduce the number of meshes by 76.7% and save the calculation time by 35.5%, compared with the traditional real wall thickness method. The average calculation error of the two methods is between 0.21% and 0.93%. Furthermore, the temperature at the blade leading edge is the highest and the average temperature of the blade pressure… More >

  • Open Access

    REVIEW

    Review of Numerical Simulation of TGO Growth in Thermal Barrier Coatings

    Quan Wen, Fulei Jing, Changxian Zhang, Shibai Tang, Junjie Yang
    CMES-Computer Modeling in Engineering & Sciences, Vol.132, No.2, pp. 361-391, 2022, DOI:10.32604/cmes.2022.019528
    (This article belongs to this Special Issue: Recent Trends in Thermal Barrier Coatings for Turbine Blades: Theory, Simulation, and Experiment)
    Abstract Thermally grown oxide (TGO) is a critical factor for the service life of thermal barrier coatings (TBC). Numerical simulations of the growth process of TGO have become an effective means of comprehensively understanding the progressive damage of the TBC system. At present, technologies of numerical simulation to TGO growth include two categories: coupled chemical-mechanical methods and mechanical equivalent methods. The former is based on the diffusion analysis of oxidizing elements, which can describe the influence of bond coat (BC) consumption and phase transformation in the growth process of TGO on the mechanical behavior of each layer of TBC, and has… More >

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