Processing-temperature dependent micro- and macro-mechanical properties of SiC fiber reinforced SiC matrix composites

Yang, Lingwei; Liu, H.T.; Cheng, Haifeng

doi:10.1016/j.compositesb.2017.07.079

Cited by 64 publications

(15 citation statements)

References 53 publications

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“…At 800 and 1000°C, the interfacial shear strength was comparably low, <150 MPa, which is in accordance with a recent report in the AS f /SiO 2 composite . This weak interfacial feature in the typical oxide/oxide composite is in contrast to those traditional ceramic matrix composites where interfacial reaction generally occurred at fiber/matrix interface, thus forming strong interfacial interactions . Interestingly, the interfacial shear strength was increased significantly to ≈450 MPa, as the composite was sintered at 1200°C.…”

Section: Resultssupporting

confidence: 90%

“…20 This weak interfacial feature in the typical oxide/oxide composite is in contrast to those traditional ceramic matrix composites where interfacial reaction generally occurred at fiber/matrix interface, thus forming strong interfacial interactions. 35 Interestingly, the interfacial shear strength was increased significantly to %450 MPa, as the composite was sintered at 1200°C. Note at this temperature, phase transitions in both the AS fiber and the Al 2 O 3 matrix led to the change in the interfacial microstructure, which may alter the mechanical property of the interface.…”

Section: Micro-mechanical Properties Of Fiber Matrix and Interfacementioning

confidence: 99%

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A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

et al. 2018

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A novel methodology combining multiscale mechanical testing and finite element modeling is proposed to quantify the sintering temperature‐dependent mechanical properties of oxide matrix composites, like aluminosilicate (AS) fiber reinforced Al2O3 matrix (ASf/Al2O3) composite in this work. The results showed a high‐temperature sensitivity in the modulus/strength of AS fiber and Al2O3 matrix due to their phase transitions at 1200°C, as revealed by instrumented nanoindentation technique. The interfacial strength, as measured by a novel fiber push‐in technique, was also temperature‐dependent. Specially at 1200°C, an interfacial phase reaction was observed, which bonded the interface tightly, as a result, the interfacial shear strength was up to ≈450 MPa. Employing the measured micro‐mechanical parameters of the composite constituents enabled the prediction of deformation mechanism of the composite in microscale, which suggested a dominant role of interface on the ductile/brittle behavior of the composite in tension and shear. Accordingly, the ASf/Al2O3 composite exhibited a ductile‐to‐brittle transition as the sintering temperature increased from 800 to 1200°C, due to the prohibition of interfacial debonding at higher temperatures, in good agreement with numerical predictions. The proposed multiscale methodology provides a powerful tool to study the mechanical properties of oxide matrix composites qualitatively and quantitatively.

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Section: Resultssupporting

confidence: 90%

Section: Micro-mechanical Properties Of Fiber Matrix and Interfacementioning

confidence: 99%

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

et al. 2018

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“…This thin interphase has been reported in other PIP fabricated SiCf/ SiC composites, 37,38 and is probably a consequence of interfacial reaction between the -Si-O-Si-rich surface of KD fiber and the PCS at high temperatures. 39 A similar reaction induced interphase zone was also observed at the fiber/matrix interface in the SiCf/SiC-1000°C composite, as shown in Figure 5A-D, but the interphase was much thicker, %500 nm. Interestingly, unlike that in the SiCf/ SiC-800°C composite, the interphase in the SiCf/SiC-1000°C composite was carbon-rich in composition, and was also composed of Si and O, as evidenced by the EDX mapping of corresponding elements.…”

Section: Microstructures Of Compositessupporting

confidence: 65%

“…It is worth pointing out that the excellent microwaveabsorbing property of the SiCf/SiC-1000°C composite is difficult to be realized in monolithic PCS-SiC ceramics, unless sintered at ≥1500°C, which, on the contrary, can induce severe thermal damage to the SiC fibers. 33 Therefore, the composite structure not only benefits the mechanical enhancement of the SiCf/SiC composites, as has been extensively reported previously, 39 but also decreases the minimized fabrication temperature (%500°C) required to endow the microwave-absorbing property. The underlying mechanism will be discussed in next section.…”

Section: Dielectric Properties Of the Compositementioning

confidence: 66%

Enhanced microwave‐absorbing property of precursor infiltration and pyrolysis derived SiCf/SiC composites at X band: Role of carbon‐rich interphase

Yang

Liu

2018

J Am Ceram Soc

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Ceramic matrix composites (CMCs) can be microwave-absorbent when endowing the composite constituents with proper dielectric properties. In this work, we report a new method to enhance the microwave-absorbing property of CMCs by in situ fabrication of a carbon-rich interphase at the fiber/matrix interface. This was achieved in a SiC fiber reinforced SiC matrix (SiCf/SiC) composite fabricated by precursor infiltration and pyrolysis (PIP). We found that as the PIP temperature increased from 800 to 1000°C, the microwave-absorbing property of the SiCf/SiC composite was significantly enhanced at X band, which also surpassed those of the SiC fiber and monolithic SiC ceramic fabricated at the same temperature. The dominant mechanism was studied by decoupling the effect of individual SiC fibers, SiC matrix, and fiber/matrix interface. The results showed that the SiC fiber and SiC matrix were barely microwave-absorbent, due to their low dielectric losses. The microwave-absorbing mechanism was finally ascribed to the fiber/matrix interface, which was carbon-rich, containing Si and O elements. The interphase showed a conductivity that was superior to that of the fiber and the matrix, and mainly dominated the dielectric property of the overall composite. The results highlight the role of carbon-rich interphase on the microwave-absorbing property of CMCs. K E Y W O R D Sceramic matrix composites, dielectric materials/properties, electromagnetic properties

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“…SiC/SiC composites are usually reinforced with two-dimensional fiber fabrics but tri-dimensional geometries have been developed with the help of weaving and braiding techniques to overcome the occurrence of delamination observed within laminated architectures [5]. Various routes can be used to process SiC/SiC composites including a gas phase route like chemical vapor infiltration (CVI) and liquid phase routes like reactive melting infiltration and polymer impregnation and pyrolysis [6]. Depending on this process, a SiC/SiC composite may exhibit significant residual porosity (typically 10-15% for the CVI route) at the microscale (several micrometers) between fibers within the tows and at the mesoscale (i.e.…”

Section: Introductionmentioning

confidence: 99%

A finite fracture model for the analysis of multi-cracking in woven ceramic matrix composites

Martín

Leguillon

et al. 2018

Composites Part B: Engineering

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:A finite fracture approach based on the Coupled Criterion is used to analyze multi-cracking in a woven ceramic matrix composite. In-situ micrographic observations obtained during tensile and bending tests performed on chemical vapor infiltrated SiC/SiC samples are utilized to identify cracking mechanisms. A two dimensional finite element model is generated to approximate the actual specimen section geometry including matrix, fiber tows and porosity. Numerical simulations are carried out with a dedicated algorithm to simulate nucleation and propagation of cracks. Comparing the simulation results with experimental ones shows that the model captures the main cracking features.

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Processing-temperature dependent micro- and macro-mechanical properties of SiC fiber reinforced SiC matrix composites

Cited by 64 publications

References 53 publications

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

Enhanced microwave‐absorbing property of precursor infiltration and pyrolysis derived SiCf/SiC composites at X band: Role of carbon‐rich interphase

A finite fracture model for the analysis of multi-cracking in woven ceramic matrix composites

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