Evolution of microstructure and mechanical properties of PIP-C/SiC composites after high-temperature oxidation

Xiang, Yanhong; Cao, Feng; Peng, Zhihang; Wang, Yi; Li, Guangde

doi:10.1016/j.jascer.2017.07.001

Cited by 12 publications

(2 citation statements)

References 30 publications

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“…Figure 3(b) shows the microstructure of the S1 composite without interface, and it can be found that there is obvious interface debonding in the matrix and fiber. This is mainly due to the mismatch of thermal expansion coefficient between matrix and fiber and the volume effect of matrix cracking [ 23 ]. The S3 sample has a dense and uniform PyC interface, as shown in Figure 3(a) , and the overall microstructure of the material is relatively complete.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties and Failure Behavior of 3D-SiCf/SiC Composites with Different Interphases

Jin

et al. 2020

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Continuous silicon carbide fiber-reinforced silicon carbide ceramic matrix composites (SiCf/SiC) are promising as thermal structural materials. In this work, the microstructure and static mechanical properties of 3D-SiCf/SiC with PyC, SiC, and PyC/SiC and without an interface prepared via polymer infiltration and pyrolysis (PIP) were investigated systematically in this paper. The results show that the microstructure and static mechanical properties of SiCf/SiC with an interphase layer were superior to the composites without an interlayer, and the interface debondings are existing in the composite without an interphase, resulting in a weak interface bonding. When the interphase is introduced, the interfacial shear strength is improved, the crack can be deflected, and the fracture energy can be absorbed. Meanwhile, the shear strength of the composites with PyC and PyC/SiC interfaces was 118 MPa and 124 MPa, respectively, and showing little difference in bending properties. This indicates that the sublayer SiC of the PyC/SiC multilayer interface limits the binding state and the plastic deformation of PyC interphase, and it is helpful to improve the mechanical properties of SiCf/SiC.

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Section: Resultsmentioning

confidence: 99%

Mechanical Properties and Failure Behavior of 3D-SiCf/SiC Composites with Different Interphases

Jin

et al. 2020

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“…In recent years, researchers have conducted many investigations on its mechanical properties of C/SiC composites. They often rely on physical information released from the internal changes in materials to describe the damage process, such as electrical resistance, mechanical parameters, acoustic emission (AE) [11][12][13][14][15][16][17]. AE is defined as a phenomenon whereby transient elastic waves are generated by the rapid release of energy from a localized source or sources within a material [18].…”

Section: Introductionmentioning

confidence: 99%

Compression damage identification of stitched 2D-C/SiC based on acoustic emission pattern recognition

Zhang

Tong

Lyu

et al. 2021

Journal of Asian Ceramic Societies

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Compression tests of stitched 2D-C/SiC at room temperature were implemented and monitored by acoustic emission (AE). The t-Distributed Stochastic Neighbor Embedding(t-SNE) and the ward-link hierarchical clustering (WLHC) algorithm were used to perform the pattern recognition of the AE data. AE signals were divided into four clusters and labeled by matrix cracking in fiber bundle, matrix cracking between fiber bundles, fiber cluster breakage, interlaminar delamination & friction respectively, according to their physical foundation. It is found:(1) the compression failure process of stitched C/SiC experiences the initial damage stage with a few low-energy AE signals, the damage development stage beginning with high-energy fiber cluster breakage, and the damage acceleration stage in which fiber cluster breakage and interlaminar damage develop rapidly; (2) the macroscopic fracture generally originates from the sparse location of the stitches, and the spacing and uniformity of the stitches have a great impact on the form of fiber breakage and the area of individual delamination damage rather than the direction of the stitches; (3) fiber cluster breakage and interlaminar delamination & friction are the main factors of stitched 2D-C/SiC compressive failure modes, the sum of the corresponding AE events accounts for about 60% of all AE events.

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Effect of Thermal Cycling on Microstructure and Mechanical Properties of C_f/SiC–Al Composites

et al. 2023

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Thermal cycling inevitably affects the microstructure and mechanical properties of composites due to the differences in thermal expansion coefficients (CTEs) of each component. Herein, the evolution of the microstructure and in‐plane compressive properties of Cf/SiC–Al composites after different thermal cycles at different temperature differences are investigated. Moreover, the magnitude and state of residual thermal stress in each component of the composites after thermal cycling are further analyzed by X‐ray diffraction and nanoindentation methods. The results show that with the increase of the temperature difference and the number of thermal cycles, the residual stress in each component gradually accumulates, accompanied by interface debonding and microcracks in the fiber/matrix interface area, which can release part of the residual stress. The evolution of the residual stress and the interface microstructure has a significant effect on the in‐plane compressive strength of the composites. The release of residual stress and the generation of some microcracks are beneficial to the compressive strength, but too many microcracks can reduce the strength.

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Evolution of microstructure and mechanical properties of PIP-C/SiC composites after high-temperature oxidation

Cited by 12 publications

References 30 publications

Mechanical Properties and Failure Behavior of 3D-SiCf/SiC Composites with Different Interphases

Mechanical Properties and Failure Behavior of 3D-SiCf/SiC Composites with Different Interphases

Compression damage identification of stitched 2D-C/SiC based on acoustic emission pattern recognition

Effect of Thermal Cycling on Microstructure and Mechanical Properties of C_f/SiC–Al Composites

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Evolution of microstructure and mechanical properties of PIP-C/SiC composites after high-temperature oxidation

Cited by 12 publications

References 30 publications

Mechanical Properties and Failure Behavior of 3D-SiCf/SiC Composites with Different Interphases

Mechanical Properties and Failure Behavior of 3D-SiCf/SiC Composites with Different Interphases

Compression damage identification of stitched 2D-C/SiC based on acoustic emission pattern recognition

Effect of Thermal Cycling on Microstructure and Mechanical Properties of Cf/SiC–Al Composites

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Effect of Thermal Cycling on Microstructure and Mechanical Properties of C_f/SiC–Al Composites