Properties of CVD BN-COATed Hi-Nicalon Fiber Reinforced SiC/SiC Composite

Saeki, Akinori; Takeda, Michio; Yokoyama, Akira; Yoshida, Takuji

doi:10.1002/9780470294628.ch42

Cited by 7 publications

(3 citation statements)

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“…9)11) Currently, carbon or hexagonal-boron nitride (h-BN) coating on SiC fibers by gas phase routes such as chemical vapor deposition (CVD) or chemical vapor infiltration (CVI) has been applied for SiC f /SiC composites as the interphase with the thickness of several tens to several hundreds of nanometers. 10),12), 13) However, these gas phase-based processes generally require very long time to form the interphase coating on SiC fibers for SiC f /SiC composites because of low ceramic yield and slow deposition rate. In addition, these processes generally use corrosive, hazardous, flammable or combustible reactant gases, and both the reactant and exhaust gasses increase the environmental load and the apparatuses for these processes become complicated.…”

Section: Introductionmentioning

confidence: 99%

Formation of carbon interphase on low electric conductive SiC fibers for SiC<sub>f</sub>/SiC composites by electrophoretic deposition process and their mechanical properties

Yoshida,

Ajito,

Gubarevich

et al. 2023

J. Ceram. Soc. Japan

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Continuous silicon carbide fiber-reinforced silicon carbide (SiC f /SiC) composites have been expected as nextgeneration highly reliable heat resistant materials. It is well-known that the interface between fiber and matrix acts as an important role for toughening and strengthening SiC f /SiC composites, and it should be optimally controlled to achieve high performance SiC f /SiC composites with excellent fracture tolerance. In this study, polypyrrole (Ppy) as an electric conductive polymer was coated on amorphous SiC fibers to increase their surface electric conductivity so that electrophoretic deposition (EPD) method can be applied to form the interphase on the SiC fibers, and carbon interphase was formed on the SiC fibers by EPD method. In addition, unidirectional SiC f /SiC composites were fabricated by polymer impregnation and pyrolysis (PIP) process, and their mechanical properties were evaluated. Thin Ppy coating with the thickness of around 200 nm drastically increased the surface electric conductivity of the amorphous SiC fibers, and the surface of Ppy-coated SiC fibers was wholly and uniformly coated with flaky graphite particles by EPD. The average thickness of the carbon interphase formed on the Ppy-coated SiC fibers by EPD became thicker with an increase in EPD voltage, and it was revealed that the SiC f /SiC composites with carbon interphase formed by EPD showed pseudo-ductile fracture behavior and excellent mechanical properties, and the formation of the thick carbon interphase (average thickness; 0.7 « 0.4 ¯m, EPD voltage; 5 V) provided the higher bending strength and fracture energy under the experimental condition in present study. These results demonstrated that Ppy coating on the lowconductive SiC fibers was very effective to improve their surface electric conductivity, and uniform and sufficient carbon coating was successfully formed on the SiC fibers by EPD for achieving high performance SiC f /SiC composites.

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Section: Introductionmentioning

confidence: 99%

Formation of carbon interphase on low electric conductive SiC fibers for SiC<sub>f</sub>/SiC composites by electrophoretic deposition process and their mechanical properties

Yoshida,

Ajito,

Gubarevich

et al. 2023

J. Ceram. Soc. Japan

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“…12), 13) Currently, carbon or boron nitride (BN) coating is formed on SiC fibers by chemical vapor deposition (CVD) to obtain the optimum fiber/matrix interface in SiCf /SiC composite. 14), 15) Continuous SiCf /SiC composites are mainly fabricated by chemical vapor infiltration (CVI) method, polymer infiltration and pyrolysis (PIP) method and reaction sintering process. 16)- 19) CVI and PIP processes have some advantages such as SiC matrix with high purity, minimizing damage to fibers, and making nearnet shape parts.…”

Section: Introductionmentioning

confidence: 99%

Development of silicon carbide fiber-reinforced silicon carbide matrix composites with high performance based on interfacial and microstructure control

Yoshida

2010

J. Ceram. Soc. Japan

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Continuous SiC fiber-reinforced SiC matrix composites (SiCf /SiC) have been considered to be a key material as structural components for aerospace and energy fields. This paper reviews novel fabrication process of continuous SiCf /SiC composites with high performance based on interfacial and microstructure control and our approach to improvement of mechanical and thermal properties of SiCf /SiC composite based on modeling and analysis. The simple fabrication process of two-dimensional SiCf /SiC composite using sheet stacking and hot-pressing based on interfacial and microstructure control was developed, and dense SiCf /SiC composite with excellent mechanical and thermal properties was successfully obtained. Furthermore, novel fabrication process of SiCf /SiC composite using EPD process was proposed and it was demonstrated that EPD process is expected to be an effective way to control the fiber/matrix interface and the microstructure of SiCf /SiC composite with high performance. Interfacial properties of SiCf /SiC composite were quantitatively evaluated by push-in test using nanoindenter, and these quantitative results well agreed with the results on their mechanical properties, and these results lead to the material design of the SiCf /SiC composite with high mechanical properties and the optimization of its fabrication process. Simple model of thermal conductivity of SiCf /SiC composite based on series model of multilayered structure was suggested by our experimental data, and higher thermal conductivity of SiCf /SiC composite was successfully achieved by microstructure control.

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“…[9][10][11] At present, carbon or hexagonal-boron nitride (h-BN) has been coated on SiC fibers by chemical vapor deposition (CVD) or chemical vapor infiltration (CVI) as the interphase with the thickness of several tens to hundreds of nanometers for SiC f /SiC composites. 10,12,13 However, these processes based on gas-phase routes generally need complicated apparatuses and long time to form the interphase on SiC fibers because of low ceramic yield and slow deposition rate, and they use toxic, flammable or combustible reactant gases, resulting in higher production cost and an increase in environmental load. Furthermore, the corrosive gases damage the chamber of the interphase formation apparatus, resulting in the need of frequent equipment maintenance.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of SiC_f/SiC composites with h‐BN interphase formed by the electrophoretic deposition method

Yoshida,

Kasakura,

Gubarevich

et al. 2024

Int J Applied Ceramic Tech

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Silicon carbide fiber–reinforced silicon carbide (SiCf/SiC) composites have been expected to be used as next‐generation heat resistant structural materials with high reliability. The fiber/matrix interface for SiCf/SiC composites plays an important role for toughening and strengthening, and it is important to form the optimal interphase for SiCf/SiC composites. In this study, hexagonal‐boron nitride (h‐BN), which shows better oxidation resistance than carbon, was selected as the interphase for SiCf/SiC composites, and h‐BN coating was formed on low‐conductive SiC fibers by the electrophoretic deposition (EPD) method using flaked h‐BN suspension prepared by wet‐jet milling. Unidirectional SiCf/SiC composites with the BN interphase formed by the EPD method were prepared by polymer impregnation and pyrolysis (PIP) method, and their mechanical properties were evaluated. The uniform h‐BN interphase was successfully formed on the low‐conductive SiC fibers by EPD when thin polypyrrole (Ppy) coating, that is, conductive polymer, was formed on the SiC fibers. The h‐BN coating became denser by heat‐treatment at 1000°C, and the h‐BN coating deposited tightly on the SiC fibers was confirmed. It was demonstrated that the SiCf/SiC composites with the uniform and relatively dense h‐BN interphase formed by EPD using flaked h‐BN particles exhibited pseudo‐ductile fracture behavior with large amount of fiber pullout and higher fracture energy.

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Properties of CVD BN-COATed Hi-Nicalon Fiber Reinforced SiC/SiC Composite

Cited by 7 publications

References 0 publications

Formation of carbon interphase on low electric conductive SiC fibers for SiC<sub>f</sub>/SiC composites by electrophoretic deposition process and their mechanical properties

Formation of carbon interphase on low electric conductive SiC fibers for SiC<sub>f</sub>/SiC composites by electrophoretic deposition process and their mechanical properties

Development of silicon carbide fiber-reinforced silicon carbide matrix composites with high performance based on interfacial and microstructure control

Mechanical properties of SiC_f/SiC composites with h‐BN interphase formed by the electrophoretic deposition method

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Properties of CVD BN-COATed Hi-Nicalon Fiber Reinforced SiC/SiC Composite

Cited by 7 publications

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Formation of carbon interphase on low electric conductive SiC fibers for SiC<sub>f</sub>/SiC composites by electrophoretic deposition process and their mechanical properties

Formation of carbon interphase on low electric conductive SiC fibers for SiC<sub>f</sub>/SiC composites by electrophoretic deposition process and their mechanical properties

Development of silicon carbide fiber-reinforced silicon carbide matrix composites with high performance based on interfacial and microstructure control

Mechanical properties of SiCf/SiC composites with h‐BN interphase formed by the electrophoretic deposition method

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Mechanical properties of SiC_f/SiC composites with h‐BN interphase formed by the electrophoretic deposition method