COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Guangda Guo,Fang Ye,Laifei Cheng,Zhaochen Li,Litong Zhang
SiC/SiC composites, prepared by reactive melt infiltration (RMI), exhibit exceptional properties. However, the presence of residual Si in the composite matrix can significantly compromise their high-temperature mechanical properties. Addressing the issue of high-content residual Si aggregation remains a crucial focus of research in order to fully unlock the application potential of SiC/SiC composites prepared by RMI. In this work, a special porous carbon (C g ) is successfully synthesized and introduced into the porous 2D SiC/SiC composites prepared by CVI. The unique pore structure of the SiC/SiC-C g is thoroughly analyzed, along with its liquid Si infiltration process. The difference in coefficient of thermal expansion (CTE) between SiC and C g can cause thermal stress, which can destory the C g structure. Consequently, the C particles detach from the C g skeleton and react with liquid Si to create SiC. This process effectively separates residual Si and helps alleviate the negative effects of residual Si aggregation. The microstructure and phase distribution of SiC/SiC composites obtained by liquid Si infiltrating different C structures are investigated and compared, and it demonstrates the positive effect of C g on the uniform phase distribution of matrix in the composites. The as-received SiC/SiC composites possess a density of 2.94 g/cm 3 with open porosity of 1.23 %, and a flexural strength of 808.7 ± 10.2 MPa, a fracture toughness of 25.5 ± 1.8 MPa·m 1/2 , a tensile strength of 317.4 ± 12.4 MPa and a proportional ultimate stress of 157.33 ± 4.1 MPa. Acoustic emission (AE) and digital image correlation (DIC) technology are used to study the special mechanical behavior of composites.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Lanxin Hu,Aiyang Wang,Tian Tian,Chun Liu,Wenchao Guo,Qianglong He,Hao Wang,Jingjing Xie,Weimin Wang,Zhengyi Fu
In this study, B 4 C–SiC–rGO composites with different SiC contents were prepared by spark plasma sintering at 1800 °C for 5 min under a uniaxial pressure of 50 MPa. The effects of SiC on the microstructures and mechanical properties of the B 4 C–SiC–rGO composites were investigated. The optimal values for flexural strength (545.25 ± 23 MPa) and fracture toughness (5.72 ± 0.13 MPa·m 1/2 ) were obtained simultaneously when 15 wt.% SiC was added to 5 wt.%–GO reinforced B 4 C composites (BS15G5). It was found that SiC and rGO inhibited the grain growth of B 4 C and improved the mechanical properties of the B 4 C–SiC–rGO composites. The clear and narrow grain boundaries of rGO–B 4 C and rGO–SiC, as well as the semi-coherent B 4 C–SiC interface, indicated strong interface compatibility. The twin structures of SiC and B 4 C observed in the composites improved their fracture toughness. Crack deflection and crack bridging caused by the SiC grains as well as rGO bridging and rGO pull-out were observed on the crack propagation path.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Gui Li,Jianjie Hao,Jiayan Li,Pengyu Dai,Bo Wang,Yuanqi Li,Yi Tan,Xueqiang Cao
This work firstly evaluated the effect of temperature on the preparation of SiC coating using Al 2 O 3 as catalyst by pack cementation (PC) method. SiC/ZrB 2 -SiC-Si (ZSS) and SiC/ZrB 2 -SiC-Al 2 O 3 (ZSA) coating were prepared on the surface of C/C composites by PC combined with atmospheric plasma spraying (APS). The objective of this work is to study the influence of Si and Al 2 O 3 additives for ablation performances of ZrB 2 -SiC coating. The coated samples were subjected to ablation test, and the phase composition and microstructure evolution were investigated. The results indicated that SiC/ZSA coating had better ablation resistance because phase transformation and growth of ZrO 2 grain was restrained by Al 2 O 3 .
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Meihan Ren,Xiao You,Mengli Xiao,Han Luo,Yudong Xue,Chunjing Liao,Haijun Zhou,Jinshan Yang,Xiangyu Zhang,Shaoming Dong
The reliable jointing of SiC f /SiC is considered to be a key factor limiting the application in the field of nuclear cladding. In this work, a jointing layer with interconnected SiC nanowires (SiCNWs) toughening network is prepared by a typical two-step routine. The high-viscosity slurry containing the precursor is pyrolyzed to form a porous SiC-based jointing layer, which is then densified by chemical vapor infiltration. Besides, SiC powders are introduced into the slurry to further increase the density of the jointing layer. The homogeneous SiC jointing material enables the strength and effectively avoids the mismatch between the thermal expansion coefficient of the jointing layer and SiC f /SiC composites, and the apparent shear strength of the jointing specimen reaches 7.211 MPa. It is found that the joint with SiCNWs shows better shear strength than the joint without SiCNWs, and the improved mechanical properties could be attributed to the pull-out and bridging of SiCNWs.
研究领域:
材料科学
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核工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Debao Liu,Baolu Shi,Chenqi Wang,Zeshuai Li,Xianbo Wang,Baosheng Xu,Lijie Qu
Herein, the SiC ceramic aerogels with in-situ growth of SiC nanowires (SiC w /SiC CAs) have been synthesized by polymer‐derived ceramics (PDCs) method. The morphology, microstructure, and phase composition of the as-prepared samples were systematically investigated through SEM, XRD , TEM , Raman spectrum, FT-IR spectrum, and XPS spectrum techniques. The results showed that the as-obtained SiC w has a diameter of about 80 nm and a length of 1–3.5 μm. In addition, the formation mechanism and evolution process of growth SiC w were systematically studied using a VLS growth mechanisms. The way in this work could be expanded to synthesize other Si-based porous ceramic aerogel nanostructed with nanowires.
研究领域:
材料科学
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纳米技术
·
陶瓷
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Meihan Ren,Xiao You,Han Luo,Xiaowu Chen,Chunjing Liao,Jinshan Yang,Xiangyu Zhang,Shaoming Dong
The reliable joining of SiC f /SiC composites is crucial for manufacturing large and complex shaped components. In this work, a reliable joining of SiC f /SiC composites is successfully fabricated using the reactive bonding method by introducing SiC nanowires (SiCnws) and porous carbon skeleton. The interconnected SiCnws network enhances the structural stability of the joint, while the porous carbon skeleton promotes the infiltration of molten Si and provides the carbon source for in-situ SiC formation, resulting in a dense and defect-free microstructure of the joint. The microstructure and mechanical properties of the joints are systematically evaluated, and the joint exhibits a dense morphology free of pores and cracks, with a considerable shear strength of 32.23 MPa. The excellent mechanical performance can be attributed to the bridging and pulling out of SiCnws, which effectively dissipate the energy required for crack propagation and delay crack propagation. Additionally, the high compressive residual stress inside the joint helps to suppress crack propagation and improve the fracture resistance of the joint.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2025
·
IF 3.2
Shaobo Yang,Chenxi Liang,Jiali Li,Yujie Ma,Sijie Kou,Juanli Deng,Bo Chen,Shangwu Fan
The study investigated the corrosion behavior and mechanical performance of SiC/SiC composite joints with Y 2 O 3 -Al 2 O 3 -SiO 2 (YAS) interlayers under high-temperature steam environments at 1200 °C. Under low-flow conditions, partial disruption of Si-O and Al-O bonds in the YAS glass network reduced crosslinking, forming an aluminosilicate protective layer that inhibited further corrosion. Prolonged exposure led to Y 3+ migration and accumulation, resulting in Y 2 Si 2 O 7 precipitation and growth. High-flow conditions caused a thinner glass layer, continuous longitudinal cracks, and more severe erosion and dissolution of the YAS glass due to higher steam velocity. Despite these degradations, the joints exhibited satisfactory performance, maintaining shear strengths of about 40 ± 2 MPa after 15 h of low-flow exposure and about 36 ± 5 MPa after 5 h of high-flow exposure. These findings demonstrate that YAS interlayers provide excellent corrosion resistance and mechanical stability as a sealant for nuclear-grade SiC/SiC.
研究领域:
材料科学
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工程学
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Keda Xiao,Yi Zeng,Xiang Xiong,Jinrun Hu,Shiyan Chen,Tianyou Li
Si-B-Mo-Y modified SiC/SiC composites were prepared by reactive melt infiltration (RMI) process to study their high-temperature water-oxygen corrosion resistance, and to compare them with SiC/SiC composites prepared by RMI using Si. The results show that the corrosion rates of the modified composites are only 1/9, 1/10 and 1/3 of those of the comparison samples at 1200°C, 1300°C and 1400°C, respectively, which is attributed to the higher densification of the modified composites. More importantly, the modified composites were able to form borosilicates, which effectively healed the oxide film defects; meanwhile, yttrium silicate inhibited the reaction between borosilicates and water vapor.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhuocheng Xie,Jialin Bai,Xiumin Yao,Xuejian Liu,Hanning Xiao
Mesocarbon microbeads (MCMB) have significant potential for enhancing the dry friction performance of SiC. However, the weak bonding between MCMB and SiC leads to a high wear rate in MCMB-SiC composites. This study addressed this issue by in situ formation of a SiC shell on the MCMB surface using the molten salt templating (MSS) method, followed by preparing MCMB@SiC-SiC composites through hot-pressing sintering. The in-situ SiC shell created a strong chemical bond between the MCMB and SiC, improving the interaction between the phases. Comprehensive investigations into the effects of the MCMB@SiC content on the microstructure, mechanical properties, dry friction, and wear performance revealed that the MCMB@SiC-SiC composites exhibited excellent dry friction performance, with a coefficient of 0.24 and a wear rate of 6.6 × 10 −7 mm 3 N −1 m −1 . Compared with the MCMB-SiC composites without the shell structure, the MCMB@SiC-SiC composites exhibited a 36 % reduction in the dry friction coefficient (μ) and an 81 % reduction in the wear rate (WR). The SiC shell structure effectively prevented MCMB extraction and SiC spalling, making this innovative design a promising solution for enhancing the performance of SiC as a sealing material under severe conditions.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhaoxin Zhong,Biao Zhang,Jian Ye,Ye Gao,Qiang Liu,Zhiguo Zhang,Feng Ye
Porous SiC ceramics have recently attracted wide attention for their applications in the electrically heatable filter. Further improvement of the thermal and electrical conductivity without sacrificing permeability is a critical parameter for such applications. In the present work, porous SiC/Ti 3 SiC 2 ceramic composites with Ti 3 SiC 2 and micro/nano SiC have been prepared from TiC/Si/α-SiC mixtures at a low sintering temperature (1400 °C). Nano-laminated Ti 3 SiC 2 enhanced the electrical conductivity , while the good thermal conductivity was achieved through in-situ formed nano β-SiC and raw coarse α-SiC in the porous ceramics . Along with the increase of initial α-SiC particle size from 0.76 to 16.13 μm, the permeability, thermal and electrical conductivity improved due to the decreased porosity and increased pore size in porous SiC/Ti 3 SiC 2 ceramics. The results suggested that the decoupling of the electrical conductivity from the thermal conductivity could be tuned by adjusting the initial α-SiC particle size.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Peng Zhang,Yuhui Zhao,Jiale Huang,Jie Li,Lin Cao,Jianan Liu,Guofeng Han,Wenbo Du,Lihua Chen,Linlin Xiao,Qiwei Wang,Yingfei Yang,Sheng Zhu,Wei Li
Ni-W-SiC composite coatings with mixed nano- and micro-sized SiC particles are prepared by the pulsed electrodeposition . The microstructure, microhardness , wear and corrosion resistances of the composite coatings were studied as a function of the mixed ratios of nano- to micro-sized SiC. The results showed that the nano-sized SiC can be carried by micro-sized SiC during the deposition process, resulting in a greater amount of nano-sized SiC being incorporated into the composite coatings without agglomeration. The wear resistance of the composite coatings with a mixture of nano- and micro-sized SiC is improved. The highest microhardness is obtained on Ni-W-SiC coating containing a ratio of nano- to micro-sized SiC particles of 1:3. However, as a result of the blockage of the Faradaic current by the inert SiC particles, composite coatings with the highest total SiC content exhibited the best corrosion resistance. Discussions are conducted in detail regarding the effects of mixture particles on microstructure, microhardness, wear and corrosion resistance of the composite coatings. Moreover, the interaction between the nano- and micro-sized SiC during the deposition process are also discussed.
研究领域:
材料科学
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电化学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·2041-2052
·
IF 2.956
Yehong Cheng,Yang Lyu,Wenbo Han,Ping Hu,Shanbao Zhou,Xinghong Zhang
The design of bioinspired architectures is effective for increasing the toughness of ceramic materials. Particularly, a dual composite equiaxial architecture is ideal for fabricating weak interface-toughened ZrB 2 -SiC ceramics with isotropic performance. In this paper, ZrB 2 -SiC-Graphene@ZrB 2 -SiC dual composite ceramics were synthesized via an innovative processing technique of granulating-coating method. ZrB 2 -20 vol.% SiC containing 30 vol.% Graphene was selected as weak interface to realize multiscale toughening and improve the thermal shock resistance of ZrB 2 -SiC ceramic materials. The incorporation of ZrB 2 -SiC-Graphene weak interface into the ZrB 2 -SiC matrix improved the damage tolerance and critical thermal shock temperature difference. The design of equiaxial structures moderated the anisotropy of performance in different planes. The graphene sheets incorporated in the ZrB 2 -SiC-Graphene interface phase played a key role in multiscale toughening, including macroscopic toughening of crack deflection and microcracks, and microscopic toughening of graphene bridging and pull-out.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）