Revealing the oxidation growth mechanism and crack evolution law of Si-HfO2/Yb2Si2O7/Yb2SiO5/high-entropy hafnate thermal/environmental barrier coatings during thermal cycling

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of The European Ceramic Society Pub Date : 2024-10-09 DOI:10.1016/j.jeurceramsoc.2024.116979

Ruixiang Liu , Wenping Liang , Qiang Miao , Hui Zhao , Xiaofeng Zhang , Shijie Sun , Feilong Jia , Kai Zang , Rongxue Yan , Xiaoqi Tan , Qijia Liu , Min Wu

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Abstract

The Si-HfO₂/Yb₂Si₂O₇/Yb₂SiO₅/(Dy_0.2Ho_0.2Er_0.2Tm_0.2Lu_0.2)₂Hf₂O₇ thermal/environmental barrier coating (T/EBC) protects ceramic matrix composites (CMCs) from turbine multi-corrosive media erosion. Challenges persist in the thermal cycling performance of multi-layered T/EBC, notably in understanding the oxidation of the Si-HfO₂ bond coat, compatibility of its mixed thermally grown oxide (m-TGO) with adjacent layers, and the evolution of cracks caused by thermal cycling. Utilizing plasma spraying physical vapor deposition (PS-PVD), this T/EBC on CMC substrates withstands up to 200 hours at 1450 ℃ to 1550 ℃. The m-TGO oxidation follows a parabolic growth curve, with oxygen diffusion activation energies of 160.31 kJ/mol from 1450 ℃ to 1500 ℃, and 125.16 kJ/mol from 1500 ℃ to 1550 ℃. Thermo-mechanical calculations indicate that elastic strain energy accumulation causes interlaminar cracks between m-TGO and adjacent layers. Controlling mud crack density is key to preventing the stress attraction at the tips of bifurcated cracks, thereby avoiding the formation of interlaminar cracks.

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揭示热循环过程中 Si-HfO2/Yb2Si2O7/Yb2SiO5/high-entropy hafnate 热/环境屏障涂层的氧化生长机理和裂纹演变规律

Si-HfO2/Yb2Si2O7/Yb2SiO5/(Dy0.2Ho0.2Er0.2Tm0.2Lu0.2)2Hf2O7热/环境屏障涂层（T/EBC）可保护陶瓷基复合材料（CMC）免受涡轮多腐蚀介质的侵蚀。多层 T/EBC 的热循环性能一直面临挑战，特别是在了解 Si-HfO2 结合层的氧化、混合热生长氧化物 (m-TGO) 与相邻层的兼容性以及热循环引起的裂纹演变方面。利用等离子喷涂物理气相沉积（PS-PVD）技术，CMC 基底上的 T/EBC 在 1450 ℃ 至 1550 ℃ 下可承受长达 200 小时的温度。m-TGO 氧化遵循抛物线增长曲线，从 1450 ℃ 到 1500 ℃ 的氧扩散活化能为 160.31 kJ/mol，从 1500 ℃ 到 1550 ℃ 的氧扩散活化能为 125.16 kJ/mol。热力学计算表明，弹性应变能的积累会导致 m-TGO 与相邻层之间产生层间裂缝。控制泥浆裂纹密度是防止分叉裂纹尖端产生应力吸引，从而避免形成层间裂纹的关键。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.