Characterization of the oxidation of C/C/SiC composites by Xray micro-tomography

Goulmy, Jean‐Patrick; Caty, Olivier; Rebillat, F.

doi:10.1016/j.jeurceramsoc.2020.06.042

Cited by 18 publications

(5 citation statements)

References 33 publications

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“…In addition, the high O 2 concentration and high temperatures cause the C fibers and PyC to be easily oxidized near the edge of the brake discs, which causes the carbon fibers to pull out and possibly fracture, which then damages the continuity of the TBL 38,39 . The exposed carbon fibers and PyC react with O to form CO 2 , causing severe oxidative wear under the action of frictional heat 40–43 . At this time, the wear forms are mainly fatigue and oxidative wear.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Tribological behavior and wear mechanism of C/C–SiC brake discs based on third‐body layer

Yang¹,

Liu²,

Shi³

et al. 2022

Int J Applied Ceramic Tech

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C/C-SiC composites are promising candidates for heavy-duty tracked vehicle brake discs. A third-body layer (TBL) can be formed on the surface of C/C-SiC self-mated brake discs, which has an important impact on tribological behavior and wear mechanism of brake discs. Herein, the formation conditions and evolution process of TBL and its effect on friction and wear properties were investigated. An appropriate braking pressure and speed (P and V) are beneficial to the cutting of asperities and refinement of wear debris on the contact surface, which are preconditions for the formation of original TBL. The original TBL can be formed under the P⋅V of 12, 15, and 16, which effectively improve braking stability and reduce the wear rate. During the continuous braking process, the original TBL undergoes growth, stabilization, destruction, and regeneration. Under the frictional heat and compressive stress, wear debris gradually evolves into a uniform and dense TBL. The average coefficient of friction and wear rate reach to the lowest value of .446 and 38.5 × 10 −3 cm 3 /MJ, respectively. A continuous high temperature in the later stages of braking leads to severe oxidative wear. The newly formed TBL covers the original surface to form a multilayered structure, indicating the TBL undergoes destruction and regeneration.

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Section: Resultsmentioning

confidence: 99%

“…38,39 The exposed carbon fibers and PyC react with O to form CO 2 , causing severe oxidative wear under the action of frictional heat. [40][41][42][43] At this time, the wear forms are mainly fatigue and oxidative wear.…”

Section: Influence Of the Tbl On The Tribological Behavior And Wear M...mentioning

confidence: 99%

Tribological behavior and wear mechanism of C/C–SiC brake discs based on third‐body layer

Yang¹,

Liu²,

Shi³

et al. 2022

Int J Applied Ceramic Tech

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“…The mechanical properties of C/C–SiC composites are influenced by various factors, including processing temperature, holding time, the density of porous C/C composite, and structure of the carbon‐fiber preform 11–17 . Among these factors, the structure of the carbon‐fiber preform significantly impacts both the mechanical properties and the densification process of C/C–SiC composites 17,18 . The orientation and volume fraction of carbon fiber directly affects the mechanical properties of the composite, with the content of long fiber bundles in the axial direction enhancing the tensile properties of C/C–SiC composites in that direction 19 .…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14][15][16][17] Among these factors, the structure of the carbon-fiber preform significantly impacts both the mechanical properties and the densification process of C/C-SiC composites. 17,18 The orientation and volume fraction of carbon fiber directly affects the mechanical properties of the composite, with the content of long fiber bundles in the axial direction enhancing the tensile properties of C/C-SiC composites in that direction. 19 However, the impact of fiber volume fraction on other mechanical properties of C/C-SiC composites, such as flexural, compressive, and interlaminar shear properties, is not fully understood, despite their importance in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Effects of preform structure on microstructure and mechanical properties of long/short fiber‐coupled C/C–SiC composites

Ye,

Wang,

Xiong

et al. 2024

Int J Applied Ceramic Tech

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C/C–SiC composites with four different preform structures were prepared via chemical vapor infiltration and reactive melt infiltration (RMI). The effects of preform structure on the microstructure and mechanical properties of the C/C–SiC composites were thoroughly investigated. The results indicate that the porous C/C composites with multidirectional long/short fiber‐coupling exhibited consistent pore size distribution (diameter: 5–300 µm) and periodicity pore distribution characteristics. As the effective fiber volume fraction in the loading direction of the C/C–SiC composites increased from 11.71% to 21.04%, the tensile and flexural strength significantly increased by 64.44% and 44.03%, respectively, with minimal effect on compressive and interlaminar shear properties. The introduction of Z‐direction fiber, such as stitched structure, increased the compressive and interlaminar shear strength of the composites by 10.87% and 15.67%, respectively. A theoretical predictive model of ultimate tensile strength after modification was validated for application to the C/C–SiC composites prepared by RMI, through characterization of the volume fraction of each layered unit and the content of each component. However, the presence of defects caused by the stitched structure, such as fiber bending, occupancy, and pores, reduced tensile and flexural strength by 30.45% and 28.56%, thereby impacting the effectiveness of the predictive model negatively.

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“…Optical and scanning electron microscopies are common methods to evaluate the impact of oxidation on the microstructure of materials [11][12] . However, comparing with them, non-destructive techniques such as tomography have many advantages, such as non-invasiveness, 3D imaging and quantitative analysis [13][14] . This technique has been used extensively by few authors to characterize the microstructure of composites during in-situ mechanical tests, different stages of the manufacturing process and after oxidation of the material [15][16][17] .…”

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confidence: 99%

Characterization of the Oxidation of 3D Needled C/C Composite by Synchrotron Radiation X-Ray Micro-Computed Tomography

Gao¹,

Xin²,

Hu³

et al. 2021

Preprint

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C/C composite has been considering to be used as structural components in the field of nuclear energy. However, the material will be subjected to rapid oxidation in the air. This paper presents the microstructure evolutions of a type of high density C/C composites at 550℃ in the air. Synchrotron radiation X-ray micro-computed tomography (SR-µCT, resolution: 0.65µm) was used to characterize the microstructure in different oxidation stages. The results showed that the material was oxidized nearly homogeneous. The large pores play great rule in the oxidation behavior. The pores in the material started to extend quickly in initial stage and the number of pores and porosity were rapidly increased. In addition, it also can be seen that SR-µCT is a perspective tool for microstructural characterization, especially structure evolutions in the materials.

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Characterization of the oxidation of C/C/SiC composites by Xray micro-tomography

Cited by 18 publications

References 33 publications

Tribological behavior and wear mechanism of C/C–SiC brake discs based on third‐body layer

Tribological behavior and wear mechanism of C/C–SiC brake discs based on third‐body layer

Effects of preform structure on microstructure and mechanical properties of long/short fiber‐coupled C/C–SiC composites

Characterization of the Oxidation of 3D Needled C/C Composite by Synchrotron Radiation X-Ray Micro-Computed Tomography

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