Microstructural development and factors affecting the performance of a reaction-bonded silicon carbide composite

Song, Suocheng; Lu, Bingheng; Gao, Zhixing; Bao, Chonggao; Ma, Yana

doi:10.1016/j.ceramint.2019.06.017

Cited by 29 publications

(13 citation statements)

References 23 publications

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“…In some cases, when the carbon content of C/SiC preforms is supersaturated, the phenomenon of capillary channel blockage can be found in RB-SiC, resulting in the presence of residual carbon in RB-SiC. The residual carbon is detrimental to the properties of RB-SiC [ 23 ]. Therefore, the theoretical optimal value of carbon content in C/SiC preforms was calculated by using Equation (2) [ 16 ]:

where μ (wt.%) is the maximum carbon content in C/SiC preform (avoiding the phenomenon of capillary channel blockage); Mc and Msic are the molar masses(g/mol) of carbon and SiC, respectively; Vsic1 (vol.%) is the volume fraction of SiC in the C/SiC preform; and W is the volume ratio of specimens before and after LSI.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of crystalline Si is due to excess Si during LSI process. After liquid Si infiltrated into the pores of C/SiC preform, part of Si reacted with carbon and the residual Si filled the pores [ 23 ]. With the increase of impregnation/carbonization cycles, the Si content gradually decreased, as was clearly indicated by the strongest diffraction peaks of Si, from crystal planes (111), (220) and (311) at 2θ of 28.4°, 47.3° and 56.1°, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure Evolution and Performance Improvement of Silicon Carbide Ceramics via Impregnation Method

Guo

Cui

et al. 2022

Materials

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The high topological silicon carbide (SiC) ceramics can be prepared by stereolithography (SLA) combined with liquid silicon infiltration (LSI) techniques. This paper aims to enhance the performance of SiC ceramics prepared by SLA and LSI techniques via the cyclic impregnation/carbonization of the precursor of carbon source solution before LSI. The effects of impregnation/carbonization cycles on the microstructure and properties of C/SiC preform and sintered body were analyzed in detail. The results show that, with the increase of impregnation/carbonization cycles, the porosity in the C/SiC preform decreases obviously and the content of secondary SiC in the sintered body increases effectively. Especially, when the impregnation/carbonization cycle was performed twice, the sintered body had the optimal mechanical properties. The value of flexural strength, bulk density and elastic modulus were 258.63 ± 8.33 MPa, 2.95 ± 0.02 g/cm3 and 425.16 ± 14.15 GPa, respectively. In addition, the thermal dimensional stability of sintered body was also improved by this method. This method proves that SiC ceramics prepared by SLA combined with LSI have the potential of applications in space optical mirrors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Microstructure Evolution and Performance Improvement of Silicon Carbide Ceramics via Impregnation Method

Guo

Cui

et al. 2022

Materials

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“…The carbon density of the PF-infiltrated parts (C/SiC preform) is the decisive factor influencing the reaction sintering process, residual-free Si content, and the performance of the final Si/SiC composites. 46,50 By properly improving the carbon density during the PF infiltration, the residual Si in the final Si/SiC part could be reduced, thus improving the mechanical properties of the final samples. Nevertheless, the porosity could be too small to the channel for liquid silicon infiltrating with excessive carbon density, leading to the existence of residual carbon and a dramatic knockdown in the performance of Si/SiC samples.…”

Section: 22mentioning

confidence: 99%

Performance optimization of Si/SiC ceramic triply periodic minimal surface structures via laser powder bed fusion

Yang

Chen

et al. 2023

J Am Ceram Soc.

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SiC ceramic lattice structures (CLSs) via additive manufacturing (AM) have been recognized as potential candidates in engineering fields owing to their various merits. Compared with traditional SiC CLSs, SiC triply periodic minimal surface (TPMS) CLSs could possess more outstanding properties, making them more promising for wider applications. Since SiC CLSs are hard to be fabricated through stereolithography technique because of inferior light performance, the LPBF process via selectively sintering is an effective method to prepare near‐net shape SiC TPMS lattices. As the mechanical performances of lattice structures are the foundation for future practical applications, it is of great significance to optimize the preparation process, thus improving the mechanical properties of SiC TPMS structures. In this work, the optimal printing parameters of the LPBF and liquid silicon infiltration process for SiC ceramic TPMS CLSs with three different volume fractions were systematically illustrated and analyzed. The effect of the printing parameters and carbon densities on the fabrication accuracy, microstructure, and mechanical performance of SiC TPMS CLSs were defined. The mechanism of the reactive sintering process for the SiC TPMS lattice structure was revealed. The results reveal that Si/SiC TPMS CLSs with optimum preparation have superior manufacturing accuracy (most less than 6%), relatively high bulk densities (about 2.75g/cm3), low residual Si content (6.01%), and excellent mechanical properties (5.67 MPa, 15.4 MPa, and 44.0 MPa for Si/SiC TPMS CLSs with 25%, 40%, and 55% volume fractions).This article is protected by copyright. All rights reserved

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“…[6][7][8] Additive manufacturing can be used to produce extremely complex and accurate 3D ceramic structures. To date, several 3D printing processes have been proposed to prepare ceramic parts, such as selective laser sintering, [9][10][11][12][13][14][15][16][17][18] stereolithography, [19][20][21][22][23][24][25] binder jetting, [26][27][28] fused deposition, 29,30 and direct ink writing (DIW). 31,32 Among the reported 3D printing methods, DIW is flexible, inexpensive, and time-saving, which is capable of building complex SiC ceramic structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of solid loading and carbon additive on microstructure and mechanical properties of 3D‐printed SiC ceramic

Wen

Zeng

Pan

et al. 2022

Int J Applied Ceramic Tech

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3D-printed SiC ceramics were prepared by direct ink writing and solid-phase sintering. The effects of sintering temperature, solid loading, and carbon additive on microstructures and mechanical properties of 3D-printed SiC parts were investigated. It was found that the sintering temperature affected the evolution of the microstructure and mechanical properties of the sintered SiC parts. A high solid loading promoted the densification and mechanical properties of the sintered SiC parts. However, the solid loading exceeded 40 vol.%, which decreased the density and mechanical properties of the samples. The carbon additives could improve the densification of the SiC parts and enhance their mechanical properties. When the sucrose content increased from 0 to 8 wt.%, the open porosity of the SiC part decreased from 26.12% to 3.15%, whereas the flexural strength increased 2.19 times. Using the optimized components and process parameters, the high-performance 3D-printed SiC parts were achieved.

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Microstructural development and factors affecting the performance of a reaction-bonded silicon carbide composite

Cited by 29 publications

References 23 publications

Microstructure Evolution and Performance Improvement of Silicon Carbide Ceramics via Impregnation Method

Microstructure Evolution and Performance Improvement of Silicon Carbide Ceramics via Impregnation Method

Performance optimization of Si/SiC ceramic triply periodic minimal surface structures via laser powder bed fusion

Effect of solid loading and carbon additive on microstructure and mechanical properties of 3D‐printed SiC ceramic

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