Mechanical behavior of SiC/SiC composites reinforced with new Tyranno SA4 fibers: Effect of interphase thickness and comparison with Tyranno SA3 and Hi-Nicalon S reinforced composites

Braun, James; Sauder, Cédric

doi:10.1016/j.jnucmat.2021.153367

Cited by 18 publications

(10 citation statements)

References 53 publications

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“…The evolution of reduced modulus (Figure 10a) is similar for all materials, with a rapid above 50 MPa consecutive to the beginning of the matrix multicracking phenomenon. The saturation value of matrix cracking (Equation ( 2)) is reached in the 200-250 MPa range, before the ultimate failure, as observed in previous studies on HNS-based composites [25,36]. This tends to demonstrate that ISS is not strong, but intermediate for these materials.…”

Section: Unloading-reloading Cycles Analysissupporting

confidence: 74%

“…These results highlight the influence of PyC texture and PyC thickness on F/M bonding in HNS/PyC/SiC composites. PyC thickness reduces the F/M bonding, as previously demonstrated [25,42,43], but to a greater extent for PyCLA interphase than for PyCHA interphase. Finally, the original result is that PyCLA leads to lower F/M bonding strength compared to PyCHA for a similar thickness.…”

Section: Push-out Testssupporting

confidence: 68%

“…Detailed thermal-induced residual stresses calculation in each phase (i.e., fiber, interphase and matrix) is detailed elsewhere [35]. Even if the model is based on a single fiber and concentric cylinders of interphase and matrix, good correlations for minicomposites [19] and 2D tubular composites [25,36] have already been reported. The thermomechanical properties as a function of temperature were fitted with Equation (1) and the constants used for the calculations are presented in Table 3.…”

Section: Thermal Induced Residual Stressesmentioning

confidence: 99%

“…The influence of the nature of a PyC interphase (thickness and/or texture) on the mechanical behaviors of C/SiC was already studied [17][18][19], but these studies were only dedicated to carbon fiber reinforcement. Although the influence of pyrocarbon interphase thickness is well known in SiC/SiC composites [20][21][22][23][24][25], its textural organization influence has only been studied recently on unidirectional model composites (minicomposites) [26]. Moreover, the irradiation behavior of a carbon phase depends on its microstructure/texture [27], but the consequence on fiber/matrix bonding in SiC/SiC composites is still unknown and needs to be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Texture and Thickness of Pyrocarbon Coatings as Interphase on the Mechanical Behavior of Specific 2.5D SiC/SiC Composites Reinforced with Hi-Nicalon S Fibers

2022

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In the framework of SiC/SiC composite development for nuclear applications, the influence of pyrocarbon interphase texture and thickness on the mechanical behavior both on as-processed materials and on irradiated materials is a major concern. Thus, the PyC interphase influence has to be clearly addressed to define its optimal chemical vapor infiltration processing parameters. For this purpose, specific 2.5D SiC/SiC composites reinforced with Hi-Nicalon S fibers and with two kinds of PyC texture and thickness were produced. Transmission electronic microscopy allowed PyC thickness and microstructure/texture characterizations, whereas push-out and tensile tests were employed as experimental mechanical procedures. The original result is that PyC nature directly influences the interfacial shear stress and failure mode of the weakest interface, regardless of the PyC thickness within the studied range. Adhesive failure or cohesive failure are highlighted depending on the PyC CVI deposition mechanisms. Similar post-irradiation characterizations will be required to assess the role of irradiation on the PyC microstructure/texture evolution and mechanical behavior of these materials.

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Section: Unloading-reloading Cycles Analysissupporting

confidence: 74%

Section: Push-out Testssupporting

confidence: 68%

Section: Thermal Induced Residual Stressesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Texture and Thickness of Pyrocarbon Coatings as Interphase on the Mechanical Behavior of Specific 2.5D SiC/SiC Composites Reinforced with Hi-Nicalon S Fibers

2022

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“…Should this result be confirmed, the emergence of the new grade of Tyranno SA4 SiC fiber deemed to have higher crystallite size than the Hi-Nicalon type S would increase the thermal stability of the reinforcements, and, hence, of the composite. The recent capability in producing a damage-tolerant SA4 fiber composite in the laboratory [30] offers a great opportunity to fill this performance gap.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Oxidation of Silicon Carbide Composites for Nuclear Applications at Very High Temperatures in Steam

et al. 2022

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Single-rod oxidation and quench experiments at very high temperatures in steam atmosphere were conducted with advanced, nuclear grade SiCf/SiC CMC cladding tube segments. A transient experiment was performed until severe local degradation of the sample at maximum temperature of approximately 1845 °C. The degradation was caused by complete consumption of the external CVD-SiC sealcoat, resulting in steam access to the fiber–matrix composite with less corrosion resistance. Approaching these very high temperatures was accompanied by accelerated gas release mainly of H2 and CO2, the formation of surface bubbles and white smoke. Three one-hour isothermal tests at 1700 °C in steam with final water flooding and one three-hour experiment with fast cool-down in Ar atmosphere were run under nominally identical conditions. All isothermally tested samples survived the tests without any macroscopic degradation. The mechanical performance of these quenched clad segments was not significantly affected, while maintaining a high capability to tolerate damages. Despite these harsh exposure conditions, load transfer between SiC fibers and matrix remained efficient, allowing the composites to accommodate deformation.

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Transition of material removal mechanism in cutting of unidirectional SiCf/SiC composites

Chen,

Gong,

Song

et al. 2024

Int J Adv Manuf Technol

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Mechanical behavior of SiC/SiC composites reinforced with new Tyranno SA4 fibers: Effect of interphase thickness and comparison with Tyranno SA3 and Hi-Nicalon S reinforced composites

Cited by 18 publications

References 53 publications

Influence of Texture and Thickness of Pyrocarbon Coatings as Interphase on the Mechanical Behavior of Specific 2.5D SiC/SiC Composites Reinforced with Hi-Nicalon S Fibers

Influence of Texture and Thickness of Pyrocarbon Coatings as Interphase on the Mechanical Behavior of Specific 2.5D SiC/SiC Composites Reinforced with Hi-Nicalon S Fibers

Oxidation of Silicon Carbide Composites for Nuclear Applications at Very High Temperatures in Steam

Transition of material removal mechanism in cutting of unidirectional SiCf/SiC composites

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