Characterization of the SiC&lt;sub&gt;f&lt;/sub&gt;/SiC Composite Fabricated by the Whisker Growing Assisted CVI Process

Park, Ji Yeon; Kang, S.M.; Kim, Weon Ju; Ryu, Woo Seog

doi:10.4028/0-87849-965-2.200

Cited by 2 publications

(4 citation statements)

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“…6(b) and (c). As similarly observed in previous studies that used SiC whiskers, 19,25) it was thought that SiC nanorods divided the large pores contained in the preform into smaller ones, and these newly formed small pores served as new deposition sites for the SiC matrix phase. This process was considered to have promoted the densification and uniformity of the composites.…”

Section: Sic Matrix Filling and Property Evaluationssupporting

confidence: 72%

“…Stacking fault formation of nanowires or whiskers by CVD has been reported in previous studies and has also been reported in whisker growth by solid-gas reactions such as carbothermal reactions. 19,[22][23][24] As can be seen in the microstructure of Fig. 2, the SiC nanorods grow evenly in the radial direction on the surface of the SiC fiber.…”

Section: Growth Behavior Of Sic Nanorodsmentioning

confidence: 84%

“…The thickness of the PyC layer was set to 150200 nm, within which its mechanical properties are known to be excellent. 19) SiC nanorods must be uniformly widely distributed throughout the fiber and grow thin and long to aid in subsequent chemical vapor infiltration processes. The present study attempted to determine the optimal conditions for the SiC nanorods to grow, with the reaction pressure and temperature set as process variables.…”

Section: Methodsmentioning

confidence: 99%

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Effect of SiC Nanorods on Mechanical and Thermal Properties of SiC Composites Fabricated by Chemical Vapor Infiltration

Lee¹,

Kim²,

Lee³

et al. 2019

J. Korean Ceram. Soc

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To reduce residual pores of composites and obtain a dense matrix, SiC f /SiC composites were fabricated by chemical vapor deposition (CVI) using SiC nanorods. SiC nanorods were uniformly grown in the thickness direction of the composite preform when the reaction pressure was maintained at 50 torr or 100 torr at 1,100°C. When SiC nanorods were grown, the densities of the composites were 2.57 ~ 2.65 g/cm 3 , higher than that of the composite density of 2.47 g/cm 3 for non-growing of SiC nanorods under the same conditions; grown nanorods had uniform microstructure with reduced large pores between bundles. The flexural strength, fracture toughness and thermal conductivity (room temperature) of the SiC nanorod grown composites were 412 ~ 432 MPa, 13.79 ~ 14.94 MPa·m 1/2 and 11.51 ~11.89 W/m·K, which were increases of 30%, 25%, and 25% compared to the untreated composite, respectively.

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Section: Sic Matrix Filling and Property Evaluationssupporting

confidence: 72%

Section: Growth Behavior Of Sic Nanorodsmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

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Effect of SiC Nanorods on Mechanical and Thermal Properties of SiC Composites Fabricated by Chemical Vapor Infiltration

Lee¹,

Kim²,

Lee³

et al. 2019

J. Korean Ceram. Soc

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“…The "hybrid effect" existed in this kind of micro/ nanohybrid composites. Park et al [80,81] investigated the mechanical property of SiC/SiC fabricated by whisker growing assisted CVI process. The SiC whisker was successfully introduced into 2D plain wave SiC preform via in-situ growing.…”

Section: Matrix Strengtheningmentioning

confidence: 99%

Long-term ceramic matrix composite for aeroengine

Song

Cheng

et al. 2022

J Adv Ceram

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Three strategies were proposed to prolong the service life of continuous fiber-reinforced silicon carbide ceramic matrix composite (CMC-SiC), which served as thermal-structure components of aeroengine at thermo-mechanical-oxygenic coupling environment. As for some thermal-structure components with low working stress, improving the degree of densification was crucial to prolong the service life, and the related process approaches were recited. If the thermal-structure components worked under moderate stress, the matrix cracking stress (σmc) should be improved as far as possible. The fiber preform architecture, interface shear strength, residual thermal stress, and matrix strengthening were associated with σmc in this review. Introducing self-healing components was quite significant with the appearance of matrix microcracks when CMC-SiC worked at more severe environment for hundreds of hours. The damage can be sealed by glass phase originating from the reaction between self-healing components and oxygen. The effective self-healing temperature range of different self-healing components was first summarized and distinguished. The structure, composition, and preparation process of CMC-SiC should be systematically designed and optimized to achieve long duration target.

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Characterization of the SiC<sub>f</sub>/SiC Composite Fabricated by the Whisker Growing Assisted CVI Process

Cited by 2 publications

References 0 publications

Effect of SiC Nanorods on Mechanical and Thermal Properties of SiC Composites Fabricated by Chemical Vapor Infiltration

Effect of SiC Nanorods on Mechanical and Thermal Properties of SiC Composites Fabricated by Chemical Vapor Infiltration

Long-term ceramic matrix composite for aeroengine

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