Appropriate thickness of pyrolytic carbon coating on SiC fiber reinforcement to secure reasonable quasi-ductility on NITE SiC/SiC composites

Nakazato, Naofumi; Kishimoto, Hirotatsu; Park, Joon Soo

doi:10.1016/j.ceramint.2018.07.158

Cited by 23 publications

(8 citation statements)

References 24 publications

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“…The fracture mode in this case is non-catastrophic fracture (step-like fracture), the composite materials exhibit quasi-ductility rather than pure brittleness. The quasi-ductility of the composite is caused by the addition of fibers and layered structure of composite, which is consistent with the results of Nakazato et al [5] and Nozawa et al [4]. The maximal flexural strength of 430 MPa was achieved for the composite sintered at 60 MPa for 3 min.…”

Section: Mechanical Propertiessupporting

confidence: 90%

“…SiC matrix composites reinforced with continuous SiC fibers reduce the macroscopic brittleness of the material and are characterized by quasi-ductile behavior under mechanical loading [3,4]. An interface coating such as BN or pyrolytic carbon (PyC) deposited on SiC fibers (SiC f ) can improve the mechanical properties of the SiC f /SiC composites by preventing fiber/fiber and fiber/matrix integration [5]. Another way based on the layered-structure design of composite can also improve the mechanical properties such as flexural strength and fracture toughness [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Preceramic Paper-Derived SiCf/SiCp Composites Obtained by Spark Plasma Sintering: Processing, Microstructure and Mechanical Properties

Kashkarov

Сыртанов

et al. 2020

Materials

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Ceramic matrix composites (CMCs) based on silicon carbide (SiC) are promising materials for applications as structural components used under high irradiation flux and high temperature conditions. The addition of SiC fibers (SiCf) may improve both the physical and mechanical properties of CMCs and lead to an increase in their tolerance to failure. This work describes the fabrication and characterization of novel preceramic paper-derived SiCf/SiCp composites fabricated by spark plasma sintering (SPS). The sintering temperature and pressure were 2100 °C and 20–60 MPa, respectively. The content of fibers in the composites was approx. 10 wt.%. The matrix densification and fiber distribution were examined by X-ray computed tomography and scanning electron microscopy. Short processing time avoided the destruction of SiC fibers during SPS. The flexural strength of the fabricated SiCf/SiCp composites at room temperature varies between 300 and 430 MPa depending on the processing parameters and microstructure of the fabricated composites. A quasi-ductile fracture behavior of the fabricated composites was observed.

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Section: Mechanical Propertiessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Preceramic Paper-Derived SiCf/SiCp Composites Obtained by Spark Plasma Sintering: Processing, Microstructure and Mechanical Properties

Kashkarov

Сыртанов

et al. 2020

Materials

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“…Yang and Li’s works also show that the fracture toughness decrease when the PyC interphase thickness exceeds 200 nm. 16,36 However, some research 19 noted that the appropriate thickness of PyC interphase in SiC f /SiC is 500 nm. The reason may be that the interface between matrix and interphase is strong bonding during the NITE processing, which may affect the fracture behavior of CMCs.…”

Section: Resultsmentioning

confidence: 99%

Proposal of two parameters to evaluate in-situ apparent toughness of interphase in fiber reinforced ceramic matrix composites: Three-dimensional finite element simulations

Gong

Guan

Rao

et al. 2022

Journal of Composite Materials

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Interphase structure characters such as single-layer interfacial thickness or number of multilayers may have a great influence on mechanical properties of continuous fibers reinforced ceramic matrix composites (CFRCMCs). However, the determination of the optimal interphase is still unclear for the complex microstructures of CFRCMCs. In this study, a novel Finite Element Method (FEM) -based numerical method considering mean scalar stiffness degradation and mean damage dissipation energy are proposed to quantitatively assess the effect of above structure characters on in-situ toughness of interphase. The proposed method has successfully applied on single pyrolytic carbon (PyC) layer and alternating silicon carbide/pyrolytic carbon (SiC-PyC) n multilayer systems. The results suggest that thicker PyC interphase will prone cause brittle fracture with lower toughness, whilst more layers with the same total thickness will improve fracture toughness for (SiC-PyC) n system. On the contrary, more layers with the same sublayer thickness will decrease in situ apparent fracture toughness. The proposed method explains well the previous contradictory experimental observations.

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“…The influence of the nature of a PyC interphase (thickness and/or texture) on the mechanical behaviors of C/SiC was already studied [17][18][19], but these studies were only dedicated to carbon fiber reinforcement. Although the influence of pyrocarbon interphase thickness is well known in SiC/SiC composites [20][21][22][23][24][25], its textural organization influence has only been studied recently on unidirectional model composites (minicomposites) [26]. Moreover, the irradiation behavior of a carbon phase depends on its microstructure/texture [27], but the consequence on fiber/matrix bonding in SiC/SiC composites is still unknown and needs to be addressed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Texture and Thickness of Pyrocarbon Coatings as Interphase on the Mechanical Behavior of Specific 2.5D SiC/SiC Composites Reinforced with Hi-Nicalon S Fibers

2022

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In the framework of SiC/SiC composite development for nuclear applications, the influence of pyrocarbon interphase texture and thickness on the mechanical behavior both on as-processed materials and on irradiated materials is a major concern. Thus, the PyC interphase influence has to be clearly addressed to define its optimal chemical vapor infiltration processing parameters. For this purpose, specific 2.5D SiC/SiC composites reinforced with Hi-Nicalon S fibers and with two kinds of PyC texture and thickness were produced. Transmission electronic microscopy allowed PyC thickness and microstructure/texture characterizations, whereas push-out and tensile tests were employed as experimental mechanical procedures. The original result is that PyC nature directly influences the interfacial shear stress and failure mode of the weakest interface, regardless of the PyC thickness within the studied range. Adhesive failure or cohesive failure are highlighted depending on the PyC CVI deposition mechanisms. Similar post-irradiation characterizations will be required to assess the role of irradiation on the PyC microstructure/texture evolution and mechanical behavior of these materials.

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Appropriate thickness of pyrolytic carbon coating on SiC fiber reinforcement to secure reasonable quasi-ductility on NITE SiC/SiC composites

Cited by 23 publications

References 24 publications

Preceramic Paper-Derived SiCf/SiCp Composites Obtained by Spark Plasma Sintering: Processing, Microstructure and Mechanical Properties

Preceramic Paper-Derived SiCf/SiCp Composites Obtained by Spark Plasma Sintering: Processing, Microstructure and Mechanical Properties

Proposal of two parameters to evaluate in-situ apparent toughness of interphase in fiber reinforced ceramic matrix composites: Three-dimensional finite element simulations

Influence of Texture and Thickness of Pyrocarbon Coatings as Interphase on the Mechanical Behavior of Specific 2.5D SiC/SiC Composites Reinforced with Hi-Nicalon S Fibers

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