Studying SiC/SiC Composites by X-Ray Tomography

Zhou, Xin; Zhao, Shuang; Mummery, Paul; Marrow, James

doi:10.4028/www.scientific.net/kem.602-603.416

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…X‐ray computed tomography (CT) has been developed into a powerful imaging tool in the biological and physical sciences. This technology has the ability to image the three‐dimensional (3D) structures of materials with high spatial resolution at the macroscopic‐to‐submicroscopic scales . Therefore, the interior microstructural evolution of the SiC f /SiC material (the entire construction unit of the fibers, matrix, and interface) during a moist oxidation process can be explicitly characterized by synchrotron X‐rays.…”

Section: Introductionmentioning

confidence: 99%

Oxidation and microstructure of SiC_f/SiC composites in moist air up to 1600°C by X‐ray tomographic characterization

Zhang

Bie

Pang³

et al. 2020

Int J Applied Ceramic Tech

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SiCf/SiC composites that possess PyC or BN interface layers were fabricated and then oxidized in moist air at 1000, 1200, 1400, and 1600°C. High‐resolution CT was used for capturing 3D images and quantifying the SiC phase, mesophase, and voids. The oxidation behavior and microstructural evolution of SiCf/SiC with PyC or BN interface are discussed in this study. The microstructure of the SiCf/SiC with a PyC layer was seriously damaged in moist air at high temperature, whereas the BN interface layer enhanced the oxidation resistance of the SiCf/SiC. These results are also confirmed by using XRD, oxidation mass gain, tensile testing, and SEM measurements. The results of the oxidation behavior and microstructural evolution for SiCf/SiC oxidized in dry air are also compared with the results of this study. Comparing the SiCf/SiC with a PyC interface layer, the composite with a BN interface layer oxidized in moist air exhibits a high void growth rate and a low SiO2 grain growth rate from 1000 to 1600°C. This work will provide guidance for predicting the service life of SiCf/SiC for multiscale damage rate models of materials at a local scale and will also provide guidance on the life service design of SiCf/SiC materials.

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Section: Introductionmentioning

confidence: 99%

Oxidation and microstructure of SiC_f/SiC composites in moist air up to 1600°C by X‐ray tomographic characterization

Zhang

Bie

Pang³

et al. 2020

Int J Applied Ceramic Tech

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“…Silicon carbide (SiC) attracts considerable interest as a candidate material for aerospace [1] and nuclear [2,3] applications due to its high temperature strength, creep resistance [4], oxidation resistance [5], and radiation tolerance [6]. In particular, it is considered for its use in aero-engines [7,8,9] and novel accident-tolerant core (ATC) and accident-tolerant fuel (ATF) concepts [10].…”

Section: Introductionmentioning

confidence: 99%

Statistically sound application of fiber push-out method for the study of locally non-uniform interfacial properties of SiC-SiC fiber composites

Hussey

Meyere

Deck

et al. 2020

Journal of the European Ceramic Society

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Push-out tests were performed on SiC-SiC fiber composites with single-and multi-layered pyrolytic carbon fibermatrix interphases. It is shown that experimental scatter is significant and a large number of tests is necessary in order to obtain statistically relevant values of interfacial shear strength. A difference between different regions of an individual fiber tow is observed, linked to a local porosity. It is shown that interfacial debonding occurs along the boundary between the fiber and the first carbon layer, regardless of the structure of the interphase, and thus interfacial shear strength is not directly linked to the structure of the interphase. KeywordsCeramic matrix composites (CMC); interfaces; push-out testing.Silicon carbide (SiC) attracts considerable interest as a candidate material for aerospace [1] and nuclear [2,3] applications due to its high temperature strength, creep resistance [4], oxidation resistance [5], and radiation tolerance [6]. In particular, it is considered for its use in aero-engines [7,8,9] and novel accident-tolerant core (ATC) and accident-tolerant fuel (ATF) concepts [10]. In order to overcome its inherent brittleness [11], while retaining beneficial chemical and nuclear properties, it is suggested to be used in the form of a continuous SiC fiberreinforced SiC matrix (SiC-SiC) composite [12].Pseudo-ductile behaviour is introduced via crack deflections and crack bridging, which occur at fiber-matrix interphase [13,14]. Therefore, the fracture properties of a composite are largely determined by the properties of its interphase, which needs to have low-toughness (promoting crack deflection), and high sliding friction coefficient (increasing energy absorption during fiber sliding) [15,16,17]. Various methods have been suggested for the characterization of these interphases, including micropillar compression [18], microcantilever fracture [19], fiber pull-out [20,21] and fiber push-out [22]. These methods determine different interfacial parameters, but in terms of experimental methodology they can be divided into two major groups -the ones that require manufacturing of each individual micro-specimen prior to testing (micropillar, microcantilever and pull-out testing) and the ones that allow for multiple tests on multiple fibers using a single prepared sample, thus potentially providing much higher number of tests and much better statistics (fiber push-out).Push-out is a well-established method for measuring the interfacial properties. In this method, a thin sample (typically in the range of 50 -100 µm) is manufactured in which the fibers are running in the direction as close to normal to the surface as possible. Load is applied to an individual fiber using a nanoindenter, until debonding occurs and the fiber is displaced. The technique provides the values of interfacial shear strength (ISS) and interfacial sliding friction coefficient.Push-out testing is conceptually a rather simple technique. However, a review of the available literature indicates that there exist several commo...

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“…Moreover, ZrN plays an important role in enhancing the performance of refractories as well due to its high hardness, high melting point, good thermal conductivity, excellent temperature, and corrosion resistance. SiAlON is also an important material among high‐temperature structural materials owing to its excellent thermal, mechanical properties, and chemical stability …”

Section: Introductionmentioning

confidence: 99%

Research on slag‐resistance of ZrN‐SiAlON‐SiC‐C composite refractory in different atmospheres

Cheng

Zhang

et al. 2018

Int J Applied Ceramic Tech

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The ZrN‐SiAlON composite powder was synthesized using low‐grade zircon and bauxite by carbothermal reduction nitridation at first and then ZrN‐SiAlON‐SiC‐C composite refractory were fabricated with the ZrN‐SiAlON powder, SiC particles, and a small amount of Si powder as raw materials and sucrose as the binder. The slag resistance of these composites in O2, N2 and Ar atmosphere was investigated by X‐ray diffraction, scanning electron microscopy, and energy dispersion spectra. The results show that the pores in the inside of ZrN‐SiAlON‐SiC‐C composite refractory were enlarged in oxygen atmosphere due to oxidation, which leads to the decrease in slag resistance. In argon atmosphere, blast furnace slag destroyed the sintered body of zircon, corundum, and cristobalite with the formation of CaZrO3, then infiltrated into and filled the pores inside the refractory to form a dense layer, which hindered the further erosion of the blast furnace slag. In the reducing atmosphere, the interfacial energy of the gas‐liquid phases became larger due to the reactions between blast furnace slag liquid and the gas, resulting in a larger wetting angle which prevented the erosion.

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Studying SiC/SiC Composites by X-Ray Tomography

Cited by 5 publications

References 18 publications

Oxidation and microstructure of SiC_f/SiC composites in moist air up to 1600°C by X‐ray tomographic characterization

Oxidation and microstructure of SiC_f/SiC composites in moist air up to 1600°C by X‐ray tomographic characterization

Statistically sound application of fiber push-out method for the study of locally non-uniform interfacial properties of SiC-SiC fiber composites

Research on slag‐resistance of ZrN‐SiAlON‐SiC‐C composite refractory in different atmospheres

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Studying SiC/SiC Composites by X-Ray Tomography

Cited by 5 publications

References 18 publications

Oxidation and microstructure of SiCf/SiC composites in moist air up to 1600°C by X‐ray tomographic characterization

Oxidation and microstructure of SiCf/SiC composites in moist air up to 1600°C by X‐ray tomographic characterization

Statistically sound application of fiber push-out method for the study of locally non-uniform interfacial properties of SiC-SiC fiber composites

Research on slag‐resistance of ZrN‐SiAlON‐SiC‐C composite refractory in different atmospheres

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Oxidation and microstructure of SiC_f/SiC composites in moist air up to 1600°C by X‐ray tomographic characterization

Oxidation and microstructure of SiC_f/SiC composites in moist air up to 1600°C by X‐ray tomographic characterization