CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Bin Yan,Zhi Chen,Yuting Wang,Jiaying Liu,Ruiyuan Wang,Xuankun Li,Minfeng Fang,Guanghui Li,Pinhua Rao,Yang Liu
Silicon carbide (SiC) ceramic membranes are highly valued in separation technologies for their outstanding thermal stability, chemical resistance, and durability. However, achieving precise pore size control remains a major challenge. In this work, we introduce polycarbosilane (PCS) as a pre-ceramic precursor and employ a simple dip coating-crosslinking-pyrolysis route to finely engineer SiC membrane pores. We systematically investigate the effects of substrate humidity, PCS coating concentration, oxidative crosslinking, and pyrolysis temperature on membrane morphology, pore size distribution, permeate flux, and nanoparticle rejection. Under optimized conditions (5 wt % PCS and 1000 °C pyrolysis), the mean pore diameter decreases by 20 %, and crosslinking enhances particle rejection by 31.8 %. The modified membranes also exhibit exceptional corrosion resistance, with less than 0.25 % mass loss after 30 days in pH 1 and pH 13 solutions. This approach establishes a clear humidity-loading-pore relationship and offers a scalable, controllable strategy for ceramic membrane pore engineering, paving the way for applications under harsh water treatment and chemical separation conditions.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuo Yan,Yuhong Chen,Ziqiang Yin,Binwei Huang,Quanxing Ren,Tihao Cao,Xuxin Ping,Ruibin Liu,Zhengren Huang,Qing Huang,Yinsheng Li
SiC ceramics were fabricated by spark plasma sintering of β-SiC powder with various rare-earth (RE = La, Gd, Yb, Sc) oxides and magnesia additives. The phase compositions, microstructures, lattice oxygen contents, and thermal conductivities were systematically investigated. A decrease in the cationic radius of rare-earth element resulted in an increased cationic field strength. This enhanced attraction to oxygen anion led to higher viscosity and improved high-temperature stability of the intergranular RE-Mg-Si-O liquid phase. After sintering at 1850°C, influenced by liquid-phase viscosity, the degree of β→α phase transformation in SiC and the grain size decreased with decreasing cationic radius of rare-earth element. After sintering at 2050°C, the liquid-phase viscosity significantly decreased, but volatilization became pronounced. The extent of β→α phase transformation and the grain size were affected by both liquid-phase viscosity and volatility. Larger grain size and higher affinity of rare-earth cations for oxygen anions contributed to reduce lattice oxygen content. The thermal conductivities of the SiC ceramics ranged from 192 to 229 W/mK. Notably, the SiC ceramic with Yb 2 O 3 -MgO additives exhibited the largest grain size, the lowest lattice oxygen content, and the elimination of β/α heterophase boundaries, thereby achieving the highest thermal conductivity of 229 W/mK.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Chunxue Zheng,Jie Yu,Xinyang Li,Jingbo Duan,Zhulin Huang,Ming Li,Xiaoye Hu,Yue Li
High-temperature thermal-insulation aerogels with high mechanical strength and well oxidation resistance are critical for the thermal protect system (TPS) of aerospace vehicles. However, it is still challenging to achieve large-scale preparation of aerogels that integrate the above functions through a simple method. In this work, carbon fiber (CF) felts are introduced as a reinforcement and template to prepare silicon carbide nanowire (SiC nw ) aerogel composites through a simple in-situ growth strategy. The high-strength CF as the skeleton endows high mechanical strength, and the in-situ grown SiC nw aerogels lead to good thermal insulation of the composites. More importantly, a dense SiC shell was also formed and tightly coated on the surface of CF (CF@SiC) during the in-situ growth process, which effectively protects the CF from oxidation, thus enhancing the high temperature oxidation resistance of the composites. As a result, the optimal CF@SiC/SiC nw aerogel composites possess a low thermal conductivity of only 0.056 W m −1 K −1 at room temperature. The back temperature of the 9 mm thick composites is only 151.9 °C after exposure to a butane flame at 1220 °C for 300 s, and it still maintains considerable thermal insulation and mechanical properties after the ablation. In addition, the machinability of the CF felts makes it easy to prepare the composites in various shapes and larger sizes. This work provides a simple and scalable strategy to synthesize reliable SiC-based aerogel composites for high-temperature thermal insulation applied in extreme environments.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Siqi Lan,Zhenguo Huang,Wenyan Huang,Yeqi Zhu,Jiahua Zhan,Shengjian Mao,Zhichao Xue,Rongqian Yao
Demand for SiC-based polymer-derived ceramics (PDCs) employed as hypersonic vehicle components with light weight, high strength, excellent high-temperature/ablation resistance is increasingly urgent. Herein, bulk SiC(Hf, rGO) nanocomposite PDCs were fabricated via re-pyrolyzing ball-milling blends of unique SiC(Hf, rGO) p /polyhafniumcarbosilane-vinyltriethoxysilane-graphene oxide (PHVG). Highly cross-linked PHVG can effectively optimize compact formability and improve ceramic yield. In-situ formed HfO 2 embedded in ceramic network toughens microstructure, while interfacial HfOSi increases structure disorder to improve high-temperature properties. As demonstrated, SiC(Hf, rGO) modified by 3 wt.% Hf and re-pyrolyzed at 1300 °C possess good mechanical performances including hardness (5.83 GPa), fracture toughness (4.29 MPa·m 1/2 ), compressive strength (181.83 MPa) and flexural strength (46.55 MPa). More interestingly, self-healing HfO 2 (HfSiO 4 )/SiO 2 protective layer emerging during 20 min surface ablation test at 1300 °C, timely covers defects and avoids destructive structure, thus retains stable structure and mechanical properties of specimens. Such nanocomposites can promote uses in thermal protection systems (TPS) for hypersonic vehicles against extreme high-temperature environments.
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高影响因子
Advanced Science
·
2025
·
IF 14.1
Zheng Zhang,Cui Liu,Nian Li,Wei Guo,Ying Li,Pengzhan Yang,Shudong Zhang,Zhenyang Wang
Here electrospinning and freeze-drying techniques are combined to fabricate an anisotropic SiC@SiO 2 ceramic fiber aerogels (A-SiC@SiO 2 -FAs). The anisotropic structure of the A-SiC@SiO 2 -FAs features aligned layers stacking layer-by-layer with the same direction and highly oriented 1D fibers inside each layer. The A-SiC@SiO 2 -FAs exhibit anisotropic thermal properties with an extremely low thermal conductivity of 0.018 W m −1 K −1 in the transverse direction (perpendicular to the SiC@SiO 2 nanofibers) and ≈5 times higher thermal conductivity of 0.0914 W m −1 K −1 in the axial direction due to the highly oriented SiC@SiO 2 nanofibers. The anisotropy factor of the A-SiC@SiO 2 -FAs is as high as 5.08, which exceeds most of the currently reported thermal insulation materials with anisotropic structural design, such as anisotropic wood aerogels, biaxially anisotropic PI/BC aerogels and anisotropic MXene foam, etc. The A-SiC@SiO 2 -FAs also have excellent thermal stability, maintaining structural integrity in oxidative environments at temperatures up to 1300 ° C. Moreover, these structurally distinct A-SiC@SiO 2 -FAs result in superior elastic deformation with a radial recoverable strain exceeding 60% and an axial specific modulus of 5.72 kN m kg −1 . These findings emphasize the potential of SiC nanofiber aerogels in extreme thermal environments and provide valuable insights for designing anisotropic insulation materials.
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DOI
PubMed
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2025
·Vol. 27
·期 21
·2500741
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IF 3.3
Rui Man,Dan Yu,Jiyuan Fan,Cao Wang,Zhao Li,Tong Zhou,Xinli Lu,Yan Sun
In this study, 10 wt% SiC-mixed (Ti 0.8 Nb 0.2 )C composite ceramics (TNC-10) are prepared using the spark plasma sintering method, and their oxidation behavior is examined from 1000 °C–1400 °C in air. According to the isothermal oxidation experiments, TNC-10 samples exhibit superior oxidation resistance compared to single-phase (Ti 0.8 Nb 0.2 )C ceramics and newly developed multicomponent high-entropy carbide ceramics. X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy analyses show that SiC effectively delays the outward diffusion of Nb and reduces the relative ratios of Nb and Ti in the oxides, which increase the content of (Ti δ Nb 1− δ )O 2 in the oxide layer. Furthermore, the density of the oxide layer improves due to the filling of defects by SiO 2 microparticles, which effectively impede the diffusion of oxygen. The enhanced oxidation resistance is primarily attributed to the low oxygen permeability structure of the dense oxide layer.
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高影响因子
CARBON
·
2025
·
IF 11.6
Xiaoxiao Yu,Yu Zhang,Xiaolei Nie,Wei Song,Lisha Chen,Haotian Li,Wanting Zhu,Danqi He,Mingrui Liu,Ping Wei,Wenyu Zhao,Qingjie Zhang
High infrared emissivity and excellent thermal conduction capability are crucial for the heat dissipation performance of heat dissipation coatings, which are applicable in the thermal management of modern electronic components. Herein, SiC nanowires/Edge-oxidized graphene/polyvinylidene fluoride hexafluoropropylene (SiC NWs/EOG/PVDF-HFP) composite coatings with three-dimensional thermal conductivity network structure were successfully prepared by the in-situ growth of SiC NWs between EOG layers through high-temperature carbothermal reduction reaction. The out-of-plane thermal diffusivity of the SiC NWs/EOG/PVDF-HFP composite coating was increased by 27 %, as compared with that of the EOG/PVDF-HFP coating, which was originating from the enhanced phonon conduction in the vertical direction by the in-situ growth of SiC NWs. The stacking faults and twin crystals generated by SiC NWs, the structural defects introduced by EOG, and the multi-scale surfaces and interfaces introduced by EOG and SiC NWs have jointly improved the infrared emissivity, enabling the SiC NWs/EOG/PVDF-HFP composite coating achieved an emissivity of 0.92. The copper plate coated with SiC NWs/EOG/PVDF-HFP coating achieved a temperature drop benefit of 9.3 °C, increasing by 126 %, 93 % and 78 %, respectively, as compared with that of the copper plate coated with EOG/PVDF-HFP coating, the copper plate coated with mechanically compounded SiC/EOG/PVDF-HFP coating, and the copper plate coated with mechanically compounded SiC NWs-EOG/PVDF-HFP coating. These findings highlight the great potential of the SiC NWs/EOG/PVDF-HFP composite coatings for application in the thermal management of electronic devices.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Wenming Guo,Tianci Hu,Hang Qin,Pengzhao Gao,Hanning Xiao
In this paper, Ni/SiC x O y /P–SiC was prepared as the core part of microreactor for the hydrogen production of ethanol steam reforming (ESR). The Ni/SiC x O y catalysts were supported on the porous SiC ceramic (P–SiC) by the inverse microemulsion process using the xylene solution of polycarbosilane (PCS) and the aqueous solution of nickel nitrate as the oil phase and the water phase, respectively. The morphology, loading strength and in situ reduction of the catalysts, and the performance of the catalysts for hydrogen production from ESR were investigated. The Ni catalyst particles exhibited a nearly spherical morphology and a narrow particle size distribution with an average particle size of 127 nm. The combination of the Ni/SiC x O y catalysts and the P–SiC, characterized by ultrasonic vibration for 300 s, showed good strength. Moreover, the ESR with Ni/SiC x O y /P–SiC as the core part of the catalytic microreactor showed that the ethanol conversion and selectivity of H 2 were still up to 91% and 72% after 210 min, respectively.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yujie Wang,Xiaoqiang Li,Wenjie Zhu,Ce Zheng
Conventional methods like hot pressing (HP) for fabricating SiC-ZrC ceramics typically require high temperatures and external pressure, which can significantly degrade the performance of SiC fibers and restrict the nuclear application of SiC-ZrC composites. In contrast, this work successfully fabricated dense, high-purity SiC-ZrC ceramics with no obvious residual Si using a relatively low-temperature and pressureless RMI method. An obvious correlation between byproduct ZrSi 2 and processing temperature was observed. Notably, significant phase homogeneity differences were observed in the ceramics obtained from pure Si versus Si-Zr alloy infiltration. The low-temperature and pressureless preparation process of the RMI method in this study has promoted the application of SiC-ZrC ceramics as a modified matrix in SiC f /SiC composites for accident-tolerant fuel (ATF) cladding.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Haozhang Hou,Zexu Sun,Yi Ru,Chunling Zhao,Yuan Liu,Guangying Lin,Lianyi Wang,Shusuo Li,Shengkai Gong
The free silicon content in silicon melt infiltrated ceramic matrix composites (CMC) causes the GPa-range residual microstress in silicon and SiC phases and the MPa-range average residual matrix stress in the Si-SiC matrix. These residual stresses are naturally linked to the matrix cracking stress. The complex effect of free silicon on the matrix cracking behavior in SiC fiber reinforced cross-ply laminate CMCs has been investigated by experiment and thermoelastic analysis. The CMC with the lowest silicon exhibits the highest onset cracking stress. A proposed thermoelastic model, which includes silicon crystallization expansion, reveals that the Si-SiC matrix fracture energy in the low-silicon CMC is nearly doubled due to suppressed elastic potential energy associated with the GPa-range microstresses. This improved fracture energy overturns the effect of matrix residual stress and becomes the dominant factor in determining cracking stress. These results offer an energy-based guideline for improving onset cracking stress.
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高影响因子
CORROSION SCIENCE
·
2026
·
IF 10.3
Yunlei Lv,Yongsheng Liu,Binghui Zhang,Mengzhu Liu,Shaolin Fu,Yejie Cao,Jingxin Li,Yansong Liu,Zbigniew Pedzich
HfB 2 -SiC-MoSi 2 composites with varying MoSi 2 contents were fabricated via gel-casting molding combined with reactive melt infiltration (RMI) at a relatively low temperature of 1500℃, achieving high density with porosity less than 1 % and uniformly distributed constituent phases. The composites exhibited excellent oxidation resistance during isothermal oxidation at 1650 °C, with mass gains of 15.40, 8.50, 7.38, and 11.31 mg/cm² after 100 h. The oxide layer grew thicker and tended to be uniform and dense over time. The oxidation process all followed a parabolic law. The addition of MoSi 2 significantly reduced the oxidation rate. The mechanism is attributed to the fact that the oxidation of MoSi 2 can promote the formation of additional SiO 2 glass, facilitating the rapid development of a dense protective oxide layer, thereby effectively blocking oxygen diffusion and suppressing the formation of a SiC-depleted layer. An appropriate amount of MoSi 2 , specifically 20 wt% MoSi 2 , optimizes the fluidity of the glass layer and enhances pore filling; however, excessive MoSi 2 reduces HfO 2 content and weaken viscosity. The formation of the HfSiO 4 phase with high-melting-point further improves the structural stability and oxygen resistance of the oxide scale, extending the service life at 1650°C. This work provides valuable guidance for designing oxidation-resistant materials for prolonged aerospace applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Jialong Wu,Zhen Li,Weidong Gu,Xinyan Niu,Yunbo Wang,Ding Huang,Shuangshuang Jiang,Manhong Huang,Jun Li,Guanghui Li
Densification of silicon carbide (SiC) ceramic membrane typically requires sintering temperatures above 2000 °C, resulting in high energy consumption and substantial fabrication costs, and conventional SiC membrane exhibit limited removal efficiency for small molecules. To address these challenges, a co-sintering method was employed to fabricate cobaltic oxide (Co 2 O 3 ) loaded SiC catalytic membrane, with the Co 2 O 3 content systematically optimized. Co 2 O 3 functions as both a sintering temperature-lowering aid and an active site for catalytic ozonation of pollutants. Compared to pure SiC membrane (water permeability: 1200 L m −2 h −1 bar −1 ; flexural strength: 10.5 MPa), the Co@SiC membrane demonstrated significant improvements in both water permeability (1400 L m −2 h −1 bar −1 ) and mechanical strength (13.0 MPa). Numerical simulation further elucidated the neck formation dynamics. Moreover, Co@SiC membrane effectively degrades 95 % Congo red within 20 min, attributed to the generation of superoxide radicals (•O 2 − ). Density functional theory (DFT) calculations illustrated Co sites can effectively absorb ozone molecules and break O-O bond in ozone to generate •O 2 − . Fukui index analysis further indicated •O 2 − tend to attack N=N double bonds in dye molecules. This study proposes a comprehensive understanding of low-temperature sintering behavior and catalytic ozonation performance of Co 2 O 3 modified composite membrane, offering a sustainable strategy for membrane fabrication and wastewater treatment.
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高影响因子
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