Enhancing thermal conductivity of C/SiC composites containing heat transfer channels

Cao, Liyang; Liu, Yongsheng; Zhang, Yunhai; Wang, Jing; Chen, Jie

doi:10.1016/j.jeurceramsoc.2020.04.006

Cited by 24 publications

(11 citation statements)

References 55 publications

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“…Fiber pull-out and failure mode are other important factors with a substantial impact on the mechanical properties of C/SiC composites. Fibers pull out and destruction of complex phase composition could consume energy [31] and lead to abundant cracks propagation mode. C/SiC composites with mass transfer channels possessed more complex phase composition owing to the presence of "dense band" and crystalline structure transition of SiC and C phase caused by laser ablation [32].…”

Section: Flexural Strengths Of C/sic Composites With Mass Transfer mentioning

confidence: 99%

Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

et al. 2021

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In this study, femtosecond laser assisted-chemical vapor infiltration (LA-CVI) was employed to produce C/SiC composites with 1, 3, and 5 rows of mass transfer channels. The effect of laser machining power on the quality of produced holes was investigated. The results showed that the increase in power yielded complete hole structures. The as-obtained C/SiC composites with different mass transfer channels displayed higher densification degrees with flexural strengths reaching 546 ± 15 MPa for row mass transfer channel of 3. The strengthening mechanism of the composites was linked to the increase in densification and formation of “dense band” during LA-CVI process. Multiphysics finite element simulations of the dense band and density gradient of LA-CVI C/SiC composites revealed C/SiC composites with improved densification and lower porosity due to the formation of “dense band” during LA-CVI process. In sum, LA-CVI method is promising for future preparation of ceramic matrix composites with high densities.

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Section: Flexural Strengths Of C/sic Composites With Mass Transfer mentioning

confidence: 99%

Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

et al. 2021

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“…In Katoh's research [8] , it was pointed out that the axial thermal conductivity of composites is determined by the volume fraction of axial fiber bundle and the matrix around the fiber. Cao et al [36] built a vertical heat transfer channels in C/SiC composites, which has a positive effect on improving the thermal conductivity of the material. In this paper, the three-dimensional network formed by C materials (CNTs, C fibers) significantly improves the thermal conductivity of SCCS composites.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Effect of Heat Treatment on Mechanical and Thermal Properties of SiC/SiC Composites With Three-Dimensional Carbon Network

Chen

Zhang

et al. 2021

Preprint

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SiC/SiC composites with high thermal conductivity shows promising application in field of fusion reactors. In this work, CNTs papers were fabricated by a vacuum filtration strategy while using pitch-based carbon fibers to build a network structure into SiC/SiC composite (SiC-CNTs-C/SiC, SCCS). The thermal conductivity and related mechanical properties before and after heat treatment at different temperature were investigated. The bonding between CNTs paper layers and SiC matrix were mainly mechanical. Compared to the composite without transfer channels, the bending strength of SCCS (434.54MPa) increased by 19% due to the reinforcement of transfer channels from the network structure. However, the damage to SiC fibers resulting from high temperature treatment adversely affected the mechanical properties. The disorder degree of SiC matrix and SiC fibers decreased after heat treatment while mean free path of phonons increased, which are conducive to heat transfer. Contracted to room temperature, the measured thermal conductivity at 1600℃ was 53.83 W/(m·K) in vertical direction and 29.85 W/(m·K) in plane. In summary, heat treatment apparently enhanced thermal conductivity of SCCS composites while partly sacrificed the mechanical properties.

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“…Fibers pull-out and failure mode are other important factors with a substantial impact on the mechanical properties of C/SiC composites. Fibers pull out and destruction of complex phase composition could consume energy [31] and lead to abundant cracks propagation mode. C/SiC composites with mass transfer channels possessed more complex phase composition owing to the presence of "dense band" and crystalline structures transition of SiC and C phase caused by laser ablation [32].…”

Section: Flexural Strengths Of C/sic Composites With Mass Transfer Chmentioning

confidence: 99%

Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

Wang

Cao

Zhang

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

In this work, femtosecond laser assisted-chemical vapor infiltration (LA-CVI) was employed to produce C/SiC composites with 1, 3, and 5 rows of mass transfer channels. The effects of laser machining power on the quality of produced holes were investigated. The results showed that the increase in power yielded complete hole structures. The as-obtained C/SiC composites with different mass transfer channels displayed higher densification degrees with flexural strengths reaching 546±15 MPa for row mass transfer channel of 3. The strengthening mechanism of the composites was linked to the increase in densification and formation of “dense band” during LA-CVI process. Multiphysics finite element simulations of the dense band and density gradient of LA-CVI C/SiC composites revealed C/SiC composites with improved densification and lower porosity due to the formation of “dense band” during LA-CVI process. In sum, LA-CVI method looks promising for future preparation of ceramic matrix composites with high densities.

show abstract

Enhancing thermal conductivity of C/SiC composites containing heat transfer channels

Cited by 24 publications

References 55 publications

Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

Effect of Heat Treatment on Mechanical and Thermal Properties of SiC/SiC Composites With Three-Dimensional Carbon Network

Effect of mass transfer channels on flexural strength of C/SiC composites fabricated by femtosecond laser assisted CVI method with optimized laser power

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