Influence of the carbon interface on the mechanical behavior of SiC/SiC composites

Fellah, Clémentine; Braun, James; Sauder, Cédric; Sirotti, Fausto; Berger, Marie‐Hélène

doi:10.1016/j.compositesa.2020.105867

Cited by 45 publications

(18 citation statements)

References 46 publications

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“…If the fiber/matrix interface is weak enough, the crack will deflect into the interface and propagate along fiber axis direction. If the interface is too strong, the crack will not deflect but directly cause fiber break [ 16 , 17 ]. Interphase usually plays a key role in determining the mechanical properties of materials [ 18 – 20 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Oxidation Damages on Mechanical Properties of SiC/SiC Composite Using Domestic Hi-Nicalon Type SiC Fibers

Jin

Yuan

et al. 2020

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Here, we show that when the oxidation treatment temperature exceeded 600°C, the tensile strength of SiC/SiC begins to decrease. Oxidation leads to the damages on the PyC fiber/matrix interface, which is replaced by SiO2 at higher temperature. The fracture mode converts from fiber pull-out to fiber-break as the fiber/matrix interface is filled with SiO2. Oxidation time also plays an important role in affecting the tensile strength of SiC/SiC. The tensile modulus decreases with temperature from RT to 800°C, then increases above 800°C due to the decomposition of remaining CSi x O y and crystallization of the SiC matrix. A special surface densification treatment performed in this study is confirmed to be an effective approach to reduce the oxidation damages and improve the tensile strength of SiC/SiC after oxidation.

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Section: Resultsmentioning

confidence: 99%

Influence of Oxidation Damages on Mechanical Properties of SiC/SiC Composite Using Domestic Hi-Nicalon Type SiC Fibers

Jin

Yuan

et al. 2020

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“…It is worthy to mention that when the temperature exceeds the preparation temperature (850 °C), the matrix will shrink due to PCS pyrolysis. This process will cause weight loss and crack initiations in the matrix, leading to acceleration of SiC-SiC strength reduction [10]. The chemical interactions It is worthy to mention that when the temperature exceeds the preparation temperature (850 • C), the matrix will shrink due to PCS pyrolysis.…”

Section: Methodsmentioning

confidence: 99%

“…The interface is known to play an important role in mechanical properties of materials [8,10,18,19]. According to the theory of fracture mechanics, the existence of fiber in the composite inhibits the crack propagation and improves the toughness of the material.…”

Section: Influence Of Fiber-matrix Interface Coating On Tensile Prope...mentioning

confidence: 99%

“…If the interface coating is too strong, the crack will not deflect, but directly propagate During the tensile process, crack initiations in SiC-SiC composites mainly appear in the matrix and gradually propagate to the fiber-matrix interface coating. Experiments revealed that the failure mode of SiC-SiC composites is controlled by the interface strength [10]. If the fiber-matrix interface coating is weak enough, the crack will deflect into the interface and propagate along fiber axis direction.…”

Section: Influence Of Fiber-matrix Interface Coating On Tensile Prope...mentioning

confidence: 99%

“…The Tyranno SA3-based composites with stronger interface exhibit a brittle behavior [9]. Fellah et al investigated the influence of the carbon interface on the mechanical behavior of SiC-SiC [10]. The results show that the fiber-matrix debonding behavior depends strongly on the nature of the carbon on the SiC fiber surface, which is different according to the SiC fiber.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Interface Coating on High Temperature Mechanical Properties of SiC–SiC Composite Using Domestic Hi–Nicalon Type SiC Fibers

et al. 2020

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Here we show that when the temperature exceeded 1200 °C, the tensile strength drops sharply with change of fracture mode from fiber pull-out to fiber-break. Theoretical analysis indicates that the reduction of tensile strength and change of fracture mode is due to the variation of residual radial stress on the fiber–matrix interface coating. When the temperature exceeds the preparation temperature of the composites, the residual radial stress on the fiber–matrix interface coating changes from tensile to compressive, leading to the increase of the interface strength with increasing temperature. The fracture behavior of SiC–SiC composites changes from ductile to brittle when the strength of fiber–matrix interface coating exceeds the critical value. Theoretical analysis predicts that the high temperature tensile strength can increase with a decrease in fiber–matrix interface thickness, which is verified by experiments.

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Mechanical Properties and Oxidation Behaviors of Self-Healing SiCf/SiC-SiBCN Composites Exposed to H2O/O2/Na2SO4 Environments

Ji,

Liang,

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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Influence of the carbon interface on the mechanical behavior of SiC/SiC composites

Cited by 45 publications

References 46 publications

Influence of Oxidation Damages on Mechanical Properties of SiC/SiC Composite Using Domestic Hi-Nicalon Type SiC Fibers

Influence of Oxidation Damages on Mechanical Properties of SiC/SiC Composite Using Domestic Hi-Nicalon Type SiC Fibers

Effect of Interface Coating on High Temperature Mechanical Properties of SiC–SiC Composite Using Domestic Hi–Nicalon Type SiC Fibers

Mechanical Properties and Oxidation Behaviors of Self-Healing SiCf/SiC-SiBCN Composites Exposed to H2O/O2/Na2SO4 Environments

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