Numerical modelling of CMAS infiltration and dimensionless numbers of anti-infiltration designs of thermal barrier coatings

IF 4.4 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Polymer Materials Pub Date : 2024-09-22 DOI:10.1016/j.matdes.2024.113332

Yitian Shao , Zihao Wang , Zhiyuan. Liu , Li. Yang , Yichun. Zhou

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引用次数: 0

Abstract

Resistance to calcium–magnesium–alumina–silicate (CMAS) infiltration and corrosion is a crucial problem for safely applying thermal barrier coatings (TBCs) in advanced aero engines. This work proposes a CMAS infiltration model based on the phase-field method to simulate the CMAS infiltration process in TBCs and analyse the influence factor. Further, a key dimensionless number called relative driving force

K = \frac{r σ \cos (θ_{c}) t_{s}}{μ ϛ^{2} h_{TC}^{2}}

was found to determine the CMAS infiltration depth using dimensional analysis. A criterion of K<2 was derived and was considered to be the evaluation standard of TBCs with excellent CMAS infiltration resistance. Based on K minimization, novelty TBCs with microstructure of S-shaped intercolumnar gaps and spherical pores are expected to significantly improve the resistance to CMAS infiltration and corrosion.

Abstract Image

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CMAS 渗透的数值建模和隔热涂层防渗透设计的无量纲数

抗钙镁铝硅酸盐（CMAS）渗透和腐蚀是在先进航空发动机中安全应用隔热涂层（TBC）的关键问题。本研究提出了一种基于相场法的 CMAS 渗透模型，用于模拟 TBC 中的 CMAS 渗透过程并分析其影响因素。此外，通过尺寸分析，找到了一个称为相对驱动力 K=rσcos(θc)tsμϛ2hTC2 的关键无量纲数，以确定 CMAS 的渗透深度。得出了 K<2 的标准，并将其视为具有优异抗 CMAS 渗入性能的 TBC 的评估标准。在 K 最小化的基础上，具有 S 形柱间间隙和球形孔隙微观结构的新型 TBC 可望显著提高抗 CMAS 渗入和腐蚀的能力。

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来源期刊

ACS Applied Polymer Materials Multiple-

CiteScore

7.20

自引率

6.00%

发文量

810

期刊介绍： ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.