Damage analysis of CVI SiCf/SiCm ceramic matrix composites under thermal shock

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-01-27 DOI:10.1016/j.ijfatigue.2025.108842

Xiaopeng Hu , Qing Liu , Liang Chen , Sai Liu , Jinwei Guo , Wang Zhu

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Abstract

The low density, high strength, and excellent high-temperature resistance of ceramic matrix composites (CMCs) determine their significant application value in the extreme environments of advanced aero-engines. In this paper, the thermal shock performance and internal damage evolution of CMCs materials are investigated by X-ray computed tomography (XCT), infrared thermal imaging and acoustic emission (AE) non-destructive testing technologies. The results show that the silicon carbide (SiC) sealing coating on the chemical vapor infiltration – ceramic matrix ccomposites (CVI-CMCs) substrate is severely oxidized and peels off during the cyclic thermal shock process, resulting in exposure and damage to the fiber-reinforced phase and matrix phase. The k-means clustering results of the damage modes of CMCs materials during the thermal shock cycle test can be classified to four damage modes: fiber fracture (280–360 kHz), fiber/matrix crack propagation (225–270 kHz), interlayer spalling (125–165 kHz) and interface debonding or slipping between the fiber and matrix (80–115 kHz). Environmental barrier coatings (EBCs) can enhance the thermal shock resistance of CMC materials. After 900 thermal shock cycles, the peeling area of CVI-CMCs substrate coated with the EBCs is only 15 %, significantly lower than the 25 % observed in uncoated CVI-CMC substrate.

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.