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Kim, Weon-Ju; Hwang, Ho Soo; Park, Ji Yeon; Ryu, Woo Seog

doi:10.1023/a:1023390111074

Cited by 65 publications

(10 citation statements)

References 12 publications

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“…According to Kim et al, silicon carbides contain grain boundary layers, which drives their corrosion resistance [91]. Thus, the corrosion behavior of ceramics depends not only on composition but on microstructure as well.…”

Section: Hydrothermal Corrosion Of Silicon Carbides Materialsmentioning

confidence: 99%

Behavior of Silicon Carbide Materials under Dry to Hydrothermal Conditions

et al. 2021

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Silicon carbide materials are excellent candidates for high-performance applications due to their outstanding thermomechanical properties and their strong corrosion resistance. SiC materials can be processed in various forms, from nanomaterials to continuous fibers. Common applications of SiC materials include the aerospace and nuclear fields, where the material is used in severely oxidative environments. Therefore, it is important to understand the kinetics of SiC oxidation and the parameters influencing them. The first part of this review focuses on the oxidation of SiC in dry air according to the Deal and Grove model showing that the oxidation behavior of SiC depends on the temperature and the time of oxidation. The oxidation rate can also be accelerated with the presence of H2O in the system due to its diffusion through the oxide scales. Therefore, wet oxidation is studied in the second part. The third part details the effect of hydrothermal media on the SiC materials that has been explained by different models, namely Yoshimura (1986), Hirayama (1989) and Allongue (1992). The last part of this review focuses on the hydrothermal corrosion of SiC materials from an application point of view and determine whether it is beneficial (manufacturing of materials) or detrimental (use of SiC in latest nuclear reactors).

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Section: Hydrothermal Corrosion Of Silicon Carbides Materialsmentioning

confidence: 99%

Behavior of Silicon Carbide Materials under Dry to Hydrothermal Conditions

et al. 2021

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“…These scratches appeared after surface layers dissolved in 300 • C and 8.5 MPa water. The presence of etched microstructures with grain boundaries in the images taken after the tests suggests the grain boundary could be also a starting point for corrosion [12,13,19]. Figure 6 shows the bending strengths of the four kinds of CVD-SiC specimens before and after the corrosion tests.…”

Section: Sic Matrixmentioning

confidence: 99%

“…Although many studies on the hydrothermal corrosion characteristics of SiC/SiC composites have been conducted, the hydrothermal corrosion of SiC/SiC composites remains among the various feasibility issues that have not yet been fully addressed [6][7][8]10,[12][13][14][15]. In particular, how the hydrothermal corrosion resistance of each constituent material affects the overall hydrothermal corrosion of SiC/SiC composites remains unclear.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, as for SiC fibers, although there are SiC fibers of varying purity, crystallinity, and stoichiometric ratio, it is not yet clear how they differ in terms of corrosion resistance [16][17][18]. Secondly, as for SiC matrices, high purity grade SiCs have been shown to be more resistant to corrosion but dissolved oxygen in the water accelerated corrosion [12,13,19]. The SiCs appeared to corrode by way of forming silica on the surface and silica dissolving in water at about 300 • C [14].…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal Corrosion Behaviors of Constituent Materials of SiC/SiC Composites for LWR Applications

et al. 2019

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The corrosion behaviors of SiC/SiC composite constituent materials in pure water at operating conditions, such as 300 °C and 8.5 MPa, were studied for potential application in accident-tolerant light water reactor (LWR) fuel cladding and core structures. Five kinds of SiC fibers, four kinds of SiC matrices, and three kinds of fiber/matrix interphase materials were examined in autoclaves. The potential constituent materials for future use in SiC/SiC composites were selected by considering corrosion rates and residual strength characteristics. The mass changes and the residual strength of each specimen were measured. SEM images of the surface layers were also inspected. The SiC fibers, regardless of their purity, crystallinity or stoichiometric ratio, decreased in strength due to the hydrothermal corrosion. For its part, the hydrothermal corrosion resistance of CVD-SiC, as a SiC matrix, was found to be affected by manufacturing conditions such as raw material gas type and synthesis temperature, as well as post-machining morphology. The CVD-carbon (CVD-C), as a fiber/matrix interphase material, showed good hydrothermal corrosion resistance. In order to protect the SiC fibers and the SiC matrices from hydrothermal corrosion, it would appear to be necessary to apply a dense CVD-C coating to both every fiber and the entire surface of the SiC matrices.

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“…After the doping process, the 3C-SiC coating with poor wettability is easy to clean, whereas Al droplets are harder to remove from coating with a smooth surface. Chemical vapor deposition (CVD) is a promising technique for generalizing the use of SiC; CVD has been intensively studied and applied in annealing furnaces [9,10]. Thick and highly pure SiC is needed to satisfy the basic requirements and function under harsh environments.…”

Section: Introductionmentioning

confidence: 99%

Structural Controlling of Highly-Oriented Polycrystal 3C-SiC Bulks via Halide CVD

Zheng

et al. 2019

Materials

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Highly-oriented polycrystal 3C-SiC bulks were ultra-fast fabricated via halide chemical vapor deposition (CVD) using tetrachlorosilane (SiCl4) and methane (CH4) as precursors. The effects of deposition temperature (Tdep) and total pressure (Ptot) on the orientation and surficial morphology were investigated. The results showed that the growth orientation of 3C-SiC columnar grains was strongly influenced by Tdep. With increasing Tdep, the columnar grains transformed from <111>- to <110>-oriented. The arrangement of <111>-oriented columnar grains was controlled by Ptot. Lotus-, turtle-, thorn-, and strawberry-like surface morphologies were naturally contributed by different arrangements of <111>-oriented grains, and the deposition mechanism was discussed. The wetting behaviors of CVD-SiC samples by molten aluminum were also examined at 1173 K in a high vacuum atmosphere.

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Cited by 65 publications

References 12 publications

Behavior of Silicon Carbide Materials under Dry to Hydrothermal Conditions

Behavior of Silicon Carbide Materials under Dry to Hydrothermal Conditions

Hydrothermal Corrosion Behaviors of Constituent Materials of SiC/SiC Composites for LWR Applications

Structural Controlling of Highly-Oriented Polycrystal 3C-SiC Bulks via Halide CVD

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