Recent progress in the development of SiC composites for nuclear fusion applications

Koyanagi, Takaaki; Katoh, Yutai; Nozawa, Takashi; Snead, Lance Lewis; Kondo, Sosuke; Henager, Charles H.; Ferraris, Monica; Hinoki, Tatsuya; Huang, Qing

doi:10.1016/j.jnucmat.2018.06.017

Cited by 139 publications

(47 citation statements)

References 91 publications

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“…Currently, SiCp (reinforced SiC particles), SiC/SiC f , and C f /SiC composites that are densified or filled by Si-based alloys and transition metal silicides are gaining great interest as thermal barriers, structural materials, and components for assembling re-entry space vehicles and fission/fusion nuclear reactors for their low density, remarkable hardness, chemical inertness, improved electrical and thermal stability, and excellent oxidation resistance, mainly at high temperatures [1][2][3][4][5][6][7][8]. For instance, refractory alloys and silicides, such as Zr-based alloys and Zr combined with Si, are already used as cladding materials for nuclear reactors due to their ultra-high neutron capture cross sections and an excellent long-term resistance under irradiation [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Phenomena between Liquid Si-rich Si-Zr Alloys and Glassy Carbon

et al. 2020

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To succeed in the design and optimization of liquid-assisted processes such as reactive infiltration for the fabrication of tailored refractory SiC/ZrSi 2 composites, the interfacial phenomena that occur when Si-rich Si-Zr alloys are in contact with glassy carbon (GC) were investigated for the first time by the sessile drop method at T = 1450 • C. Specifically, two different Si-rich Si-Zr alloys were selected, and the obtained results in terms of wettability, spreading kinetics, reactivity, and developed interface microstructures were compared with experimental observations that were previously obtained for the liquid Si-rich, Si-Zr, near-eutectic composition (i.e., Si-10 at.%Zr) that was processed under the same operating conditions. The increase of the Si content only weakly affected the overall phenomena that were observed at the interface. From the practical point of view, this means that even Si-Zr alloys with a higher Si content, with respect to the near eutectic alloy, may be potentially used as infiltrant materials.

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Section: Introductionmentioning

confidence: 99%

Interfacial Phenomena between Liquid Si-rich Si-Zr Alloys and Glassy Carbon

et al. 2020

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“…As the coatings were rich in carbon, the coating density ( c ) was not constant, and should be calculated according to the volume mixing law, where the volume ratio of the carbon and SiC in the coatings can be obtained by element ratio from XPS analysis. Then, the parameter c can be expressed as: ρ c = 2.764 e -0.02t (2) Combining Equations (1) and (2), and adopting f = 3.0 g/cm 3 , the coating thickness could be obtained and the results are shown in Table 1:…”

Section: Thickness Control Of the Cvd Sic Coatingsmentioning

confidence: 99%

“…SiC ceramic has attracted extensive attention due to its excellent performance, such as appropriate high-temperature strength, relatively high oxidation, corrosion and thermal-shock resistance [1][2][3][4], etc. SiC ceramic can be used in coating materials, especially in fiber-reinforced ceramic matrix composites (FRCMCs) to improve the bond strength between the fiber and matrix.…”

Section: Introductionmentioning

confidence: 99%

Deposition Mechanism and Thickness Control of CVD SiC Coatings on NextelTM440 Fibers

Wang¹,

Sun²,

Sheng³

et al. 2020

Coatings

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SiC coatings were successfully synthesized on NextelTM440 fibers by chemical vapor deposition (CVD) using methyltrichlorosilane as the original SiC source at 1373 K. After deposited, the fibers were fully surrounded by uniform coatings with some bulges. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HR-TEM) results indicated that the coatings were composed of β-SiC and free carbon. Moreover, thickness control of the coatings could be carried out by adjusting the deposition time. The coating thickness rose exponentially, and the exterior of the coatings became looser as the deposition time increased. The thickness of about 1.5 µm was obtained after depositing for 4 h. The coating thickness was also theoretically calculated, and the result agreed well with the measured thickness. Finally, the related deposition mechanism is discussed and a deposition model is built.

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“…At the present, SiC/SiCf, Cf/SiC and SiCp (SiC particles reinforced) composites densified or filled by Si-based alloys as well as transition metal silicides, are gaining great interest as thermal barriers and structural materials or components for assembling re-entry space vehicles and fission/fusion nuclear reactors for their low density, remarkable hardness, chemical inertness, high electrical and thermal stability, excellent resistance to oxidation, particularly at high temperatures [1][2][3][4][5][6][7][8]. For instance, refractory alloys and silicides, such as Zr-based alloys and Zr combined with Si are already used as cladding materials for nuclear reactors because of their ultra-high neutron capture cross sections and an excellent long-term resistance under irradiation [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Phenomena between Liquid Si-Rich Si-Zr Alloys and Glassy Carbon

Giuranno

Polkowski

Bruzda

et al. 2020

Preprint

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To design and optimize liquid-assisted processes such as reactive infiltration for fabricating refractory SiC/ZrSi2 composites, basic investigations on the interfacial phenomena occurring when liquid Si-based alloys are in contact with C and SiC substrates, are key steps. Indeed, targeted wettability studies may provide helpful indications for finding the suitable set of operating conditions to succeed the fabrication of composites via the reactive infiltration and for predicting the key influencing mechanisms. The wettability of glassy carbon (GC) by two different Si-rich Si-Zr alloys as a function of the Si-content has been investigated by the sessile drop method at T = 1450°C. The more relevant results obtained in terms of equilibrium contact angle values, spreading kinetics, reactivity and developed interface microstructures are reported in the paper and compared with the behaviour previously observed in the Si-27Zr/GC system. The increase of Si-content only weakly affected the overall phenomena observed at the interface, which from the practical point of view means that even the Si-Zr alloys with higher Si-content, as respect to the eutectic alloy (Si-27Zr), could be potentially used as infiltrant materials.

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Recent progress in the development of SiC composites for nuclear fusion applications

Cited by 139 publications

References 91 publications

Interfacial Phenomena between Liquid Si-rich Si-Zr Alloys and Glassy Carbon

Interfacial Phenomena between Liquid Si-rich Si-Zr Alloys and Glassy Carbon

Deposition Mechanism and Thickness Control of CVD SiC Coatings on NextelTM440 Fibers

Interfacial Phenomena between Liquid Si-Rich Si-Zr Alloys and Glassy Carbon

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