CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jie Tang,Meng Liu,Yuquan Wei,Yong Yang,Zhengren Huang
Liquid silicon infiltration (LSI) is a fast and low-cost method for the manufacturing of C f /SiC composites. However, due to the high reactivity of LSI process, the carbon fiber is easily to be eroded by liquid silicon. A recognized solution is to coat the fiber surface with a protective layer. Here, we report a preparation method of C f @SiC short fiber for carbon fiber protection in LSI process. First, C f @HTC short fiber with controllable thickness (1–10 μm) and uniform Hydrothermal carbon (HTC) coating was prepared by hydrothermal method . After the first LSI, silicon carbide layers which was derived from the reaction of HTC and liquid silicon had been successfully constructed on the carbon fibers with the thickness rang form 1–3 μm. This strategy demonstrates a tantalizing possibility and promising prospect to the preparation of light and high strength C f /SiC ceramic matrix composites with good fiber protection.
研究领域:
材料科学
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
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
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhengliang Liu,Wei Zhang,Huanpeng Bu,Ken Chen,Yan Jiang,Huijun Liu,Chaoliu Zeng
A novel SiC–Si coating with a high amount of net-like distributed Si was fabricated on the graphite substrate by liquid silicon infiltration (LSI) method to improve the oxidation-resistant performance. The mass gain of this LSI coating after 300 h oxidation at 1873 K was only 3.018%, suggesting an excellent static antioxidant property at 1873 K. The detailed oxidation mechanism of this LSI coating was explored in this work. It was found that the high amount of Si with the net-like distribution in this LSI coating promoted the passivation growth of SiO 2 glass layer and prevented the SiO 2 glass from crystallizing into cristobalite. In addition, the Si in this coating retarded the active oxidation and enhanced the coating stability. In contrast, the infiltration (VSI) SiC–Si coating presented an apparent mass loss, and the pack cementation (PC) SiC coating showed the catastrophic failure. The oxidation mechanisms of these two coatings were also discussed against the backdrop of the LSI coating with high antioxidant performance.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qianlong Fu,Shiquan Sui,Yuting Ma,Shuo Sun,Xiaoyu Wang,Qingbo Meng,Shuang Li,Yang Zhao
The development of additive manufacturing technique provides possibility to prepare SiC ceramics with complex shapes. However, defect control in the debinding and sintering stages is still a great challenge for the vat photopolymerized components. Here, SiC ceramics were manufactured by vat photopolymerization followed by liquid silicon infiltration, using SiC whiskers as the reinforcement. In the debinding stage, the SiC whiskers prevented the propagation of micro-cracks that induced by the formation and emission of gaseous substance. Also, the SiC whiskers provided channels for the infiltration of liquid silicon during sintering, thus the bulk density of the as-sintered SiC w /RBSC composite reached 2.95 g/cm 3 at the whiskers fraction of 8 wt%. Because of the various toughening mechanisms introduced by SiC whisker, the flexural strength and Vickers hardness of the composite increased up to 352.2 MPa and 17.54 GPa, respectively. Thus, this work provides a new strategy to control micro-defects in vat photopolymerized SiC ceramics.
研究领域:
材料科学
·
先进制造
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Heng Zhang,Yong Yang,Bin Liu,Zhengren Huang
SiC-based ceramics with periodic structure were successfully fabricated by extrusion freeforming 3D printing technology and liquid silicon infiltration process. The ceramic slurries containing SiC , carbon black, chopped carbon fiber were firstly prepared with the appropriate viscosity and rheological properties, then were formed by extrusion freeforming 3D printing technology and densified by liquid silicon infiltration sintering successively, to acquire SiC ceramic composites components. The microstructure and morphology of green parts and sintered bodies were observed. Chopped carbon fibers were found to be oriented distribution in SiC ceramic composites parts. The sintered bodies exhibited maximum flexural strength of 300 MPa and sintered linear shrinkage below 2%. The manufacturing method has demonstrated big potential to fabricate ceramic components with personalized complex structure.
研究领域:
材料科学
·
先进制造
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 5
·1717
·
IF 3.748
Wei Li,Conghui Guo,Congcong Cui,Jianxun Bao,Ge Zhang,Yubei Zhang,Shan Li,Gong Wang
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/cm3and 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.Keywords:impregnation method;liquid silicon infiltration;microstructure evolution;mechanical properties;SiC ceramics
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Lu-ming Huang,Rong-jun Liu,Yan-fei Wang,Chang-rui Zhang,Xian-hai Long,Ying-bin Cao
The dense Silicon Carbide (SiC) ceramics are fabricated by means of gel-casting and gas silicon infiltration (GSI) using carbon black and α-SiC as raw materials. We have successfully introduced a new initiator AIBA which is very suitable to aqueous gel-casting system containing carbon black, overcoming the problems posed by the conventionally used initiator. We have investigated the influences of the monomer acrylamide (AM) content, the ratio of the monomer to crosslinking agent AM/MBAM content, the particle size distribution and the solid content on the mechanical and structural properties of samples. The result show that, the linear shrinkage of the green body can be reduced to 1.0% and its bending strength can reach 59.2 MPa at the optimized gel-casting process that has an AM content of 25 wt%, an AM to MBAM ratio of 12, a SiC particle distribution of 3/2 and a solid content of 60 vol%. After the GSI process, the bending strength and elastic modulus of the final products from such green bodies can reach 245 MPa and 220 GPa respectively. The study highlights that the combined application of the gel-casting and the GSI processes can produce high-quality silicon carbide ceramics that are suitable in the space optical applications.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Shengjun Liao,Jian Chen,Changcong Huang,Chenxi Gao,Lan Peng,Zhengren Huang
A two-step debinding process, consisting of solvent debinding followed by thermal debinding has been demonstrated as an effective method for removing binders from green parts produced by powder extrusion printing. However, the organic solvents typically used in solvent debinding are often flammable, carcinogenic, and environmentally harmful. To address this issue, this study introduced a water-soluble binder system composed of polyvinyl alcohol (PVA), polymethyl methacrylate (PMMA), and ethyl vinyl acetate (EVA), specifically designed for fabricating silicon carbide (SiC) ceramic green parts via PEP. During water-based debinding, a large amount of PVA was removed, leaving micro-pores in the green part. These pores served as channels for the remaining binder to escape during thermal debinding. Subsequent processing involving phenolic resin impregnation and pyrolysis (PRIP), followed by liquid silicon infiltration (LSI), resulted in Si/SiC ceramics with a density of 2.83 ± 0.09 g/cm³ and a strength of 279.5 ± 8.4 MPa.
研究领域:
材料科学
·
陶瓷加工
✓ 已验证
产品关联
DOI
高影响因子
Open Ceramics
·
2020
·
IF 0
Xuejian Bai,Guojiao Ding,Keqiang Zhang,Wenqing Wang,Niping Zhou,Daining Fang,Rujie He
Stereolithography additive manufacturing (SL-AM) has been reported to produce SiC ceramic recently. However, both the density and strength of the stereolithography additive manufactured SiC ceramic need to be improved. In this study, different sintering approaches, including liquid phase sintering (LPS), precursor infiltration and pyrolysis (PIP), and liquid silicon infiltration (LSI), were applied based on the SL-AM prepared SiC green bodies. SiC sintered bodies were finally obtained. In each condition, the relative density, crystalline phases, microstructure, and flexural strength were investigated in detail. The relative density of the LPS-sintered SiC, PIP-sintered SiC, and LSI-sintered SiC ceramics were 78.2 ± 1.36%, 82.6 ± 0.48%, and 96.2 ± 0.32%, respectively. And the strength of the LPS-sintered SiC, PIP-sintered SiC, and LSI-sintered SiC body were 77 ± 5.2 MPa, 184.2 ± 8.5 MPa, and 210.4 ± 10.3 MPa, respectively. The density and strength were compared to each other, as well as other additive manufacturing results and traditional results. At last, LSI is found to be the most promising sintering approach for stereolithography additive manufactured SiC ceramic.
研究领域:
材料科学
·
先进制造
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yongzhao Yang,Fei Yin,Chuanqi Xiang,Lijuan Zhou,Wuhong Xin,Shuang Li
Bioinspired structures provide promising paths to address the inherent brittleness of structural ceramics. Here, we proposed a hierarchically laminated structure to enhance the damage tolerance and fracture toughness of SiC ceramics. The SiC ceramics were formed by tape casting with graphene platelets (GPLs) as the reinforcement, and then sintered by hot pressing and liquid silicon infiltration. Thus, hierarchically laminated architectures were constructed by the casting sheets, the directionally distributed GPLs and the in-situ β-SiC grains. With the increase of sintering aid, the bulk density of the laminated ceramics increased from 3.09 ± 0.03 g/cm 3 to 3.18 ± 0.02 g/cm 3 ascribed to infiltration of the glassy phases and the liquid silicon. Due to the hierarchically laminated structure, the flexural strength increased from 299.4 ± 4.1 MPa to 350.61 ± 9.5 MPa with the infiltration of liquid silicon, while the fracture toughness increased from 7.6 ± 0.8–10.4 ± 0.5 MPa·m 1/2 ascribed to the novel toughening mechanisms.
研究领域:
材料科学
·
陶瓷工程
·
复合材料
·
仿生材料
·
结构陶瓷
·
断裂力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiangang Chen,Meixia Cai,Ying Liu,Panpan Yang,Jiping Wang
This paper develops a novel adhesive for in-situ joining C/C composites to C/C-SiC composites using a phenolic resin modified with inert fillers (SiC and graphite powders). The primary phase of the reaction bonding joint layer is SiC, which matches the thermal expansion coefficient of the matrix better than metallic phases, making it an improvement over traditional brazing. The effect of filler content on joint strength, oxidation resistance, and thermal shock resistance has been systematically investigated. The results show that increasing the filler content from 0 to 50 wt% increases shear strength up to a maximum of 25.97 MPa at 15 wt% SiC and 15 wt% graphite powder. The oxidation and thermal shock tests reveal that the joints exhibit a decrease in shear strength due to oxidation at temperatures above 600 °C, with a significant reduction occurring between 600 °C and 700 °C. After seven thermal shock cycles at 800 °C, the shear strength of the joints remains relatively high, indicating the good thermal shock resistance of the bonding layer. The method proposed in this study provides a new approach for controlling residual silicon and enhancing the properties of C/C-SiC joints.
研究领域:
材料科学
·
复合材料
·
连接技术
·
热分析
·
陶瓷基复合材料
✓ 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）