Ultra-high temperature ablation behaviour of 2.5D SiC/SiC under an oxy-acetylene torch

Du, Jinkang; Yu, Guoqiang; Jia, Yunfa; Ni, Zheng; Gao, Xiang; Song, Yingdong; Wang, Fang

doi:10.1016/j.corsci.2022.110263

Cited by 21 publications

(9 citation statements)

References 27 publications

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“…To reveal the ablation mechanism of C/SiC-ZrC composites, the ablated samples were first scanned in three dimensions to reconstruct the macroscopic morphology after ablation, and the effects of different ablation methods on the ablated samples were compared; Then the thickness and mass changes of the sample before and after ablation, and analyze the ablation characteristics of the sample; Finally, by combining the microstructure and composition analysis of C/SiC-ZrC composites, the ablation performance and mechanism of the materials are revealed. The macroscopic morphology of the 2 samples shows obvious retreat on the material surface, with obvious flow marks at the edges, and a circular pit in the middle with a white oxide layer distributed [25][26] , The diameter of the pits in sample CSZ-20×2 is slightly smaller than that in sample CSZ-40, and there are exposed black fibers and matrix in some areas. There are dotted white products outside the circular pit circle.…”

Section: Results and Analysismentioning

confidence: 94%

“…Fig 3 shows the 2D needle punched C/SiC-ZrC composites CSZ-40 and CSZ-20 after ablation. The macroscopic morphology of the 2 samples shows obvious retreat on the material surface, with obvious flow marks at the edges, and a circular pit in the middle with a white oxide layer distributed[25][26] , The diameter of the pits in sample CSZ-20×2 is slightly smaller than that in sample CSZ-40, and there are exposed black fibers and matrix in some areas. There are dotted white products outside the circular pit circle.…”

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confidence: 94%

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Ablation Performance of C/SiC-ZrC Composites

Hailang,

ZHANG,

Jinkang

et al. 2024

Preprint

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To reveal the ablation performance of C/SiC-ZrC composites under different ablation methods, C/SiC-ZrC composites were prepared by chemical vapor deposition and precursor impregnation cracking methods. Single ablation and cyclic ablation tests were conducted on C/SiC-ZrC composites using an oxyacetylene flame to obtain ablation parameters and macroscopic and microscopic ablation morphology for different ablation methods. The results show that the line ablation rate and mass ablation rate of different ablation methods decrease with increasing time; The linear ablation rate and mass ablation rate of cyclic ablation are 12% and 24.2% lower than those of single ablation; Within the same ablation time, the C/SiC-ZrC composites subjected to cyclic ablation has shallower and more evenly distributed pits caused by high-temperature airflow ablation; The material surface has a white oxide layer composed of SiO2 and ZrO2, and the carbon fibers inside are wrapped by oxide particles, which improves the ablation resistance of C/SiC-ZrC composites.

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Section: Results and Analysismentioning

confidence: 94%

mentioning

confidence: 94%

Ablation Performance of C/SiC-ZrC Composites

Hailang,

ZHANG,

Jinkang

et al. 2024

Preprint

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“…It was found that the orientation of the fibers could affect the grooved morphology under confocal microscopy, as shown in Figure 5 , as it correlates with the thermal conduction velocity of the fibers being higher than that of the matrix and a large difference in the removal temperature of each component of the composite [ 12 , 13 ]. After the light beam is irradiated to the fiber, the fiber can conduct heat along the fiber arrangement direction so that the groove surface morphology of the fiber arrangement area is different from that of the matrix area.…”

Section: Resultsmentioning

confidence: 99%

“…Wei et al [ 12 ] studied the removal mechanism of CMC-SiC f /SiC by underwater femtosecond laser ablation and found that the removal mechanism of CMC-SiC f /SiC was the decomposition of SiC; they believe that the SiC matrix was first removed, and the interface layer was then removed, and the SiC fibers were finally removed. Du et al [ 13 ] ablated CMC-SiC f /SiC with oxygen-acetylene flame and found that the material removal mechanism is dominated by the sublimation of the matrix and fibers, and the ablation process is accompanied by mechanical spalling and material oxidation. Liu et al [ 14 ] used millisecond laser processing of CMC-SiC f /SiC and found that three kinds of tiny particles with different diameters were attached to the surface of the recasting layer, spherical micro protrusion (20–48 μm), bubble particle (5–15 μm), and submicron particles (<1 μm), respectively.…”

Section: Introductionmentioning

confidence: 99%

Study on the Grooved Morphology of CMC-SiCf/SiC by Dual-Beam Coupling Nanosecond Laser

Chen

Zhang

et al. 2022

Materials

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Due to the excellent properties of high hardness, oxidation resistance, and high-temperature resistance, silicon carbide fiber reinforced silicon carbide ceramic matrix composite (CMC-SiCf/SiC) is a typical difficult-to-process material. In this paper, according to the relationship between the spatial posture of dual beams and the direction of the machining path, two kinds of scanning methods were set up. The CMC-SiCf/SiC grooving experiments were carried out along different feeding directions (transverse scanning and longitudinal scanning) by using a novel dual-beam coupling nanosecond laser, and the characteristics of grooving morphology were observed by Laser Confocal Microscope, Scanning Electron Microscopy (SEM), and Energy Dispersive Spectrometer (EDS). The results show that the transverse scanning grooving section morphology is V shape, and the longitudinal scanning groove section morphology is W shape. The grooving surface depth and width of transverse scanning are larger and smaller than that of longitudinal scanning when the laser parameters are the same. The depth of the transverse grooving is greater than that of the longitudinal grooving when the laser beam is transverse and longitudinal scanning, the maximum grooving depth is approximately 145.39 μm when the laser energy density is 76.73 J/cm2, and the minimum grooving depth is approximately 83.76 μm when the laser energy density is about 29.59 J/cm2. The thermal conductivity of fiber has a significant effect on the local characteristics of the grooved morphology when using a medium energy density grooving. The obvious recasting layer is produced after the laser is applied to CMC-SiCf/SiC when using a high energy density laser grooving, which directly affects the grooved morphology.

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“…To date, much of early efforts were devoted to studying the effects of fillers, heat flux, and ablation time on the ablation performance of ablative materials. Meanwhile, CFD simulation techniques are increasingly employed to simulate the flow field distribution for supporting experimental results to reveal the ablation mechanism. − It is worth mentioning that the majority of these research relied on ablation tests with an oxyacetylene flame at a 90° ablation angle. However, when heat-shielding materials are in practical service, the angles between the gas flow and the surface of ablators are not always exactly the case. , Unfortunately, the influence of different ablative angles on the ablation behavior for LSRCs has been seldom reported.…”

Section: Introductionmentioning

confidence: 99%

Shear Ablation Behavior and Mechanism of Liquid Silicone Rubber Composites at Different Ablation Angles and Distances

Yan

Wang

et al. 2022

Ind. Eng. Chem. Res.

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The shear ablation behavior of liquid silicone rubber composites (LSRCs) was examined using an oxyacetylene flame at different ablation angles and ablation distances. Computational fluid dynamic (CFD) simulations were conducted to determine the flow field of oxyacetylene flame at different ablation angles. Results indicated that the ablation morphology of LSRCs was significantly different at different ablation angles, and the centrally symmetrical structure of ablation pits under normal ablation turned to be an eccentric asymmetric distribution under shear ablation. Linear ablation rates were greatly augmented when the ablation distance was lower than the critical value where the shear force is dominant. The accelerated ablation rate and the asymmetric ablation craters were mainly attributed to the powerful mechanical denudation induced by an intense gas flow. The disruption of continuity of the molten liquid layer and further loss initiated a more rapid elimination of the ablated boundary. This work elaborated the influence of the ablation angle on the ablation behavior of LSRCs, which provided a reference for the design of an insulation material targeted for more serious service environments.

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Ultra-high temperature ablation behaviour of 2.5D SiC/SiC under an oxy-acetylene torch

Cited by 21 publications

References 27 publications

Ablation Performance of C/SiC-ZrC Composites

Ablation Performance of C/SiC-ZrC Composites

Study on the Grooved Morphology of CMC-SiCf/SiC by Dual-Beam Coupling Nanosecond Laser

Shear Ablation Behavior and Mechanism of Liquid Silicone Rubber Composites at Different Ablation Angles and Distances

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