Mechanical property and toughening mechanism of 2.5D C/C-SiC composites with high textured pyrocarbon interface

Xu, Jianwei; Guo, Lingjun; Wang, Hanhui; Li, Kaijiao; Wang, Tiyuan

doi:10.1016/j.ceramint.2021.07.081

Cited by 19 publications

(6 citation statements)

References 39 publications

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“…The brittle fracture occurs at the ceramic matrix, showing a relatively flat surface. The main load is carried by the fiber bundles of the vertical screen, leading to the interface debonding and fiber pullout fracture 39–41 . With the increase in bulk density of the C/C preform and the HT, the overall fiber pullout length of the C/C–SiC composites increases, improving the fracture strain of the composite, as shown in Figure 9.…”

Section: Resultsmentioning

confidence: 99%

Effects of density and heat treatment of C/C preforms on microstructure and mechanical properties of C/C–SiC composites

Wang

Wen

et al. 2022

Int J Applied Ceramic Tech

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Twill multidirectional carbon-fiber-reinforced carbon and silicon carbide composites (i.e., C/C-SiC) were prepared via chemical vapor infiltration combined with reactive melt infiltration process. The effect of heat treatment (HT) on the microstructure and mechanical properties of C/C-SiC composites obtained by C/C preforms with different densities was thoroughly investigated. The results show that as the bulk density of C/C preforms increases, the thickness of the pyrolytic carbon (PyC) layer increases and open pore size distribution narrows, making the bulk density and residual silicon content of C/C-SiC composites decrease. Moreover, the flexural strength and tensile strength of the C/C-SiC composites were improved, which can be attributed to the increased thickness of the PyC layer. The compressive strength reduces due to the decrease of the ceramic phase content. HT improves the graphitization degree of PyC, which reduces the silicon-carbon reaction rate and thereby the content of the SiC phase. HT induces microcracks and porosity but not obviously affects the mechanical properties of C/C-SiC composites. However, the negative impact of HT can be compensated by the increased density of the C/C preforms.

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Section: Resultsmentioning

confidence: 99%

Effects of density and heat treatment of C/C preforms on microstructure and mechanical properties of C/C–SiC composites

Wang

Wen

et al. 2022

Int J Applied Ceramic Tech

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“…PyC is the most common interfacial layer system in ceramic matrix composites due to its advantages of stable interlayer structure and simple preparation process. However, oxidation begins at 500°C in the aerobic environment of PyC, resulting in poor oxidation resistance and limiting the service life of the composite. Boron nitride (BN) interfacial layer 22–27 : BN has a similar layered structure to PyC, which can enhance the toughness of the ceramic matrix composites. More importantly, the initial oxidation temperature of BN is as high as 900°C, which makes its oxidation resistance better than PyC.…”

Section: Introductionmentioning

confidence: 99%

“…Boron nitride (BN) interfacial layer 22–27 : BN has a similar layered structure to PyC, which can enhance the toughness of the ceramic matrix composites. More importantly, the initial oxidation temperature of BN is as high as 900°C, which makes its oxidation resistance better than PyC.…”

Section: Introductionmentioning

confidence: 99%

Effect of BN interfacial layer on the mechanical behavior of SiC fiber reinforced SiC ceramic matrix composites

Chen,

Qiu,

Zhao

et al. 2024

Int J Applied Ceramic Tech

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Boron nitride (BN) interfacial layer with controlled thickness and structure was prepared on the surface of near stoichiometric ratio SiC fiber preforms by a chemical vapor deposition process, and the SiC/SiC composites were obtained by polymer precursor infiltration and pyrolysis process. The microstructure of the BN interfacial layer and SiC/SiC composites was tested by scanning electron microscopy, and the mechanical behavior of SiC/SiC composites was characterized by a mechanical properties test. Results showed that BN interfacial layer was evenly distributed in the fiber preforms with excellent thickness consistency. As the thickness of the BN interfacial layer increased, the deflection path of the crack increased gradually, resulting in the flexural strength first increasing and then decreasing. The mechanical behavior mentioned above was mainly attributed to the dual effects of load transfer and crack propagation of the BN interfacial layer; that was, the crack propagation of ceramic matrix under external load lengthened the path of load transfer and formed a large number of fibers bridging and pulling out successively, which contributed to the energy dissipation mechanism.

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“…Xu et al [22] proved an increase in the strength and toughness of the composite, which is associated with multiple effects of deformation of carbon layers, deflection, and crack propagation caused by bridge zones, sublayers, nano-, and microcracks.…”

Section: Introductionmentioning

confidence: 99%

Pyrocarbon Coating on Granular Al2O3 for HTGR-Type Power Reactor

Sklabinskyi,

Pitel,

Skydanenko

et al. 2023

Coatings

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Fourth-generation nuclear power systems are based on high-temperature gas-cooled reactors, in which the pebble fuel is the primary energy carrier. In this regard, applying protective pyrocarbon coatings on granulated fuel is an essential problem in ensuring the reliability of nuclear power plants. The article’s main idea is to research rational technological parameters of forming a pyrocarbon protective coating on the granules of a nuclear fuel model. For this purpose, granulated Al2O3 with the protective pyrocarbone coating was applied as a fuel model. The article’s aim is to study the effect of thermophysical parameters on applying a protective pyrocarbon coating on granulated Al2O3. During the experimental studies, thermal imaging of the pyrolysis process was used. The scientific novelty of the work is the equilibrium curves for the systems Al2O3:CH4, Al2O3:CH4:N2, and Al2O3:CH4:Ar. Their analysis allowed for evaluating rational thermochemical parameters of the pyrolysis process. As a result, rational thermophysical parameters of coating granulated Al2O3 with a pyrocarbon layer were evaluated, and the practical possibility of applying the pyrocarbon coating to granulated Al2O3 in the electrothermal fluidized bed was experimentally proven. It was shown that nitrogen does not significantly affect the target reaction product under a temperature of less than 1500 K. Also, the rational conditions for the pyrocarbon coating at a pressure of 0.1 MPa were realized at a temperature of 900–1500 K and using argon. Moreover, pyrocarbon was precipitated from hydrocarbon at 1073–1273 K. Overall, the need to add an inert gas for reducing the carbon black formation was proven to prevent a reduction of natural gas efficiency.

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Mechanical property and toughening mechanism of 2.5D C/C-SiC composites with high textured pyrocarbon interface

Cited by 19 publications

References 39 publications

Effects of density and heat treatment of C/C preforms on microstructure and mechanical properties of C/C–SiC composites

Effects of density and heat treatment of C/C preforms on microstructure and mechanical properties of C/C–SiC composites

Effect of BN interfacial layer on the mechanical behavior of SiC fiber reinforced SiC ceramic matrix composites

Pyrocarbon Coating on Granular Al2O3 for HTGR-Type Power Reactor

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