JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Ye Zhang,Yong Gao,Peng Wang,Yichen Xu,Zhenming Yang,Jinsong Zhang
Membrane contactors have received considerable attention for extraction due to non-dispersive mass transfer through porous membranes. The past decades have seen the rapid development of organic hollow fiber membrane contactors, but very few studies have explored the applications of inorganic membranes in extraction, possibly due to their high costs. In this work, a novel SiC foam material with a hollow skeleton and microporous strut wall was used as a ceramic membrane contactor (HS-FCMC) for rare earths extraction. The foam's structure was characterized by scanning electron microscopy (SEM), X-ray micro-computed tomography (micro-CT), and mercury intrusion porosimetry (MIP). The flow and concentration fields inside and outside the foam cell were simulated by computational fluid dynamics (CFD), and the mass transfer through the ceramic membrane was analyzed. Based on the nitric acid–Ce 3+ /Pr 3+ –P507–kerosene chemical system, the extraction efficiency of Pr 3+ and Ce 3+ using the HS-FCMC reached 96.13% and 92.86%, respectively. A comparison study with poly tetra fluoroethylene (PTFE) hollow fibers was also conducted. The results indicate that the HS-FCMC is suitable for rare earths extraction due to the multiscale porous structure and chemical stability of the hollow-skeleton SiC foam. This research advances the knowledge of inorganic membrane extraction methods.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Zhenxiao Tang,Maozhong Yi,Qiuling Xiang,Yuhui Du,Ke Peng
An improved high-solid-loading slurry impregnation process was developed to introduce HfB 2 particles into a low-density C/C preform efficiently, and precursor infiltration and pyrolysis process was used for densification to obtain a C/C-HfB 2 -SiC composite. The microstructure characterization revealed that HfB 2 particles uniformly filled the pores in the C/C preform, and SiC well densified the interstices between HfB 2 particles and the small pores in the carbon fiber bundles. After being tested, the C/C-HfB 2 -SiC composite had a density of 4.07 g/cm 3 and a bending strength of 344.8 MPa, and exhibited a non-brittle fracture behavior. After ablation with oxyacetylene flame at 2500 ℃ for 120 s, the mass ablation rate and linear ablation rate of the C/C-HfB 2 -SiC composite were 0.5 mg/s and 0.415 μm/s, respectively. The good ablation performance is attributed to the hindering effect of the HfO 2 scale on oxygen diffusion at high temperature.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Jun-Min Zhang,Xiao-Wu Chen,Xiao You,Qing-Gang Li,Meng-Meng Wang,Xiang-Yu Zhang,Yan-Mei Kan,Yu-Dong Xue,Shao-Ming Dong
The effect of RE 2 O 3 (RE = La, Y, Er, Lu) on the oxidation behavior of RMI-SiC ceramics in air and wet oxygen atmospheres at 1400 °C were studied. The outward migration of RE 3+ cations reduces the oxidation resistance of SiC-RE ceramics in air, but improves the wet-oxidation resistance of SiC-RE ceramics due to the formation of denser RE 2 Si 2 O 7 layer. The outward migration rates of RE 3+ cations may be influenced jointly by the RE 3+ cation radius and the formation rate of RE 2 Si 2 O 7 . The higher mobility of Er 3+ and Y 3+ cations makes Y 2 O 3 and Er 2 O 3 promising modifier for enhancing the wet-oxidation resistance of RMI-SiC f /SiC composites, although the modified components need to be optimized and further analyzed in a more realistic service environment.
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高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Pengfei Li,Yongjun Liu,Zhuangzhuang Yang,Lu Yang,Pan Liu,Zhe Liu,Xiaowei Li
The complete harmless treatment of aromatic organic compounds in coal chemical wastewater (CCW) has always been a big challenge in water process engineering. This study addresses the issue by designing and preparing a kind of Ce and Al bimetallic catalyst with high oxygen vacancies (OVs) based on SiC carrier. The results showed that CeO 2 and Al 2 O 3 were uniformly dispersed on SiC, and the composite material exhibited an ordered cubic structure. The degradation efficiency and enhancement mechanism of the catalyst with ozone oxidation were investigated. When applied to actual CCW with a chemical oxygen demand (COD) concentration exceeding 600 mg/L, the synergy between O 3 and CeO 2 /Al 2 O 3 -SiC increased the degradation efficiency of phenols from 50 % to 99 % and COD from 42 % to 78 % compared to using O 3 alone. CeO 2 /Al 2 O 3 -SiC had a high concentration of oxygen vacancies (OVs = 48.57 %). Further research indicated that oxygen vacancies (OVs) were the main active sites for ozone adsorption and reactive oxygen species (ROSs) generation. Electron paramagnetic resonance (EPR) and quenching experiments also confirmed that O 3 , •O 2 −1 , 1 O 2 were the main active oxidation factors, rather than •OH. Additionally, even after granulating the catalyst, it still achieved 99 % degradation of phenols. Therefore, this study provides theoretical support for the complete harmless treatment of CCW and has broad prospects for industrial application.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Jiabao Zang,Haifeng Li,Qingzhi Zhu,Ziheng Wang,Hubuli Bazaerbieke,Li Sun,Meijie Zhang
There are few reports about the electromagnetic wave (EMW) absorption properties of α−SiC based composites, and almost all of them focus on β−SiC polymorphs. In this study, α−SiC p /α−SiC nw /SiO 2 /C hybrid composites (sample SiC−C1500) with heterostructure α−SiC nanowires (α−SiC nw ) of multiple interfaces 4H−SiC/6H−SiC/SiO 2 /C were successfully prepared using mixed powder (α−SiC+m−SiO 2 +C) as raw material based on the heterogeneous nucleation−growth mechanism, and their microwave absorption properties were investigated. Meanwhile, the samples SiC−V2150 and Si−C1500 were obtained by vacuum calcination (α−SiC+m−SiO 2 +C) at 2150 0 C and carbothermal reduction (Si+m−SiO 2 +C) at 1500 0 C, respectively, and their phase compositions were α−SiC p /C and β−SiC p /β−SiC nw /SiO 2 /C, respectively. The sample SiC−C1500 exhibited excellent EMW absorption properties, with a minimum reflection loss (RL min ) value of −18.37 dB at a thickness of 1.3 mm, and a maximum effective absorption bandwidth (EAB max ) value of 4.9 GHz at a thickness of 1.5 mm. In contrast, the EMW absorption performance of the samples SiC−V2150 and Si−C1500 was obviously poor, which was consistent with the RCS (Radar Cross−Section) simulation results. The formation of α−SiC p /α−SiC nw /SiO 2 /C composites (sample SiC−C1500) containing 4H−SiC/6H−SiC/SiO 2 /C multi-interfaces heterostructure α−SiC nanowires (α−SiC nw ) was analyzed. The excellent EMW absorption performance of SiC−C1500 sample could be attributed to the effective regulation of α polymorphs, nanowire heterostructure, multi−component hybridization. This study supplies a helpful experience and reference for improving the high temperature EMW absorption performance of SiC matrix composites.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2026
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IF 7.6
Chen Lin,Wenrui Liang,Chenyu Liu,Jinlong Huang,Yaowei He,Jiabin Lu
To address the low material removal rate (MRR) and low abrasive utilization of free abrasives as well as severe surface damage in fixed abrasive polishing, this paper proposes a pore-confined free abrasive (PC-FA) polishing disc based on Diamond@phenol-formaldehyde resin (PFR) composite abrasives for single-crystal SiC. In ethanol slurry, the PFR shell of composite abrasives dissolves selectively, confining the inner diamond cores within in-situ generated pores to act as dynamic free abrasives for high-quality, low-damage precision machining. Diamond@PFR abrasives were synthesized by solution suspension and characterized via SEM, XRD and LPSA. Three polishing discs (fixed diamond, fixed composite, PC-FA) were fabricated for comparative polishing tests. The PC-FA polishing disc achieved an MRR of 1.07 μm·h −1 and an Sa of 1.38 nm, reduced the surface roughness by 54.6% and 48.1% compared with the two fixed abrasive polishing discs. ABAQUS simulations combined with friction tests clarify the removal mechanism. Fixed abrasives bear rigid constraints, causing concentrated contact stress, deep straight scratches and two-body wear. Pore-confined diamonds move randomly with multiple degrees of freedom, thereby homogenizing stress and generating shallow and sparse scratches, as reflected by a reduced Rku value and an elevated Rsm value, with flexible three-body wear dominating material removal. This disc realizes in-situ fixed-to-free abrasive transition, achieving moderate material removal with high-quality and low-damage machining, and offers a new route for processing third-generation semiconductor substrates.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Jiahao Chen,Bin Wang,Kai Yuan,Yutang Kang,Shasha Feng,Feng Han,Hongmiao Wu,Rongfei Zhou,Zhaoxiang Zhong,Yiqun Fan,Weihong Xing
The SiC catalytic membrane combining dust removal and denitration can realize the efficacious treatment of atmospheric pollutants. Unfortunately, a large amount of SiO 2 , formed by the partial oxidation of SiC at a high temperature, results in the decreased chemical resistance of SiC catalytic membrane. In addition, the complicated preparation processes and susceptible to loss of catalytic components under harsh conditions restrict the industrial application of SiC catalytic membranes. Here, the Cu-SAPO-34(D)/SiC catalytic membranes were directly prepared via a facile one-pot hydrothermal synthesis method, which ingeniously utilized the generated SiO 2 as a Si source to participate in the growth of Cu-SAPO-34 zeolites. Excellent binding strength and chemical resistance were simultaneously realized for the SiC catalytic membranes. As a comparison, a Cu-SAPO-34(I)/SiC catalytic membrane was fabricated via the conventional two-step ion-exchange method. The 0.2 Cu-SAPO-34(D)/SiC (Cu molar ratio of 0.2) achieved the best NH 3 -SCR performance among the prepared catalytic membranes for its highly active copper and oxygen species, abundant Lewis acid sites and remarkable redox capacity. When implementing the simultaneous removal of NO and PM, the 0.2 Cu-SAPO-34(D)/SiC catalytic membrane achieved a high NO degradation performance of 98% from 200 to 280 °C, coupled with an excellent PM 0.3 (model dust with average size of 300 nm) filtration performance of 99.99%. These results were better than those of the Cu-SAPO-34(I)/SiC catalytic membrane (92% for NO degradation and 99.98% for PM 0.3 filtration). The one-pot in situ synthesis of Cu-SAPO-34(D)/SiC catalytic membrane with enhanced binding strength and chemical resistance provides a novel strategy for preparation of high-performance SiC catalytic membrane with double benefits.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2025
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IF 6.2
Huiyi Fang,Zonghao Sheng,Wenxia Wang,Chuncheng Wei,Shuang Li,Xin Geng,Xiaowei Li,Nannan Zhu,Guangwu Wen,Shun Dong,Peng Wang
The protection for carbon fibers is crucial for carbon fiber-reinforced materials. Carbon coatings were prepared on carbon fibers through gelation, hydrothermal caramelization and pyrolysis, with glucose as precursor of carbon. The glucose-to-carbon conversion mechanism was explored, as well as the effect of high pressure in hydrothermal reactor and the catalytic role of KCl. The high pressure suppressed gas escape and was beneficial to the formation of dense carbon coating. The KCl promoted the generation of 5-HMF, thereby accelerated the glucose-to-caramel conversion. C f /ZrB 2 -SiC composites were prepared by introducing ZrB 2 -SiC slurry into the carbon fiber preform and hot press sintering. The carbon coating protected the carbon fibers from damage during sintering at high temperature. The carbon coating significantly improved the flexural strength, fracture toughness, and fracture work of C f /ZrB 2 -SiC composites from 122 MPa, 3.24 MPa‧m 1/2 , and 231.6 J/m 2 to 321 MPa, 5.87 MPa‧m 1/2 , and 567.1 J/m 2 , respectively.
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高影响因子
International Journal of Applied Ceramic Technology
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2019
·Vol. 16
·期 3
·1004-1011
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IF 1.074
Rong Tu,Xian Zhang,Youfeng Lai,Mingxu Han,Song Zhang,Ji Shi,Haiwen Li,Takashi Goto,Lianmeng Zhang
Cubic SiC (3C-SiC) is a promising material for nuclear industry applications due to its excellent properties. In this report, a highly oriented thick 3C-SiC coating with good crystallinity was prepared on the inner surface of a monolithic graphite tube via high-frequency induction-heated halide chemical vapor deposition using SiCl 4 , CH 4 , and H 2 as precursors. The texture coefficient ( T C (hkl) ), microstructure, and deposition rate along the tube axis was studied. 3C-SiC coating with a high (111) orientation and crystallinity was obtained. Along the tube axis, T C (111) was consistent with the temperature distribution. The surficial morphology of the 3C-SiC coating changed from pebble-like to hexangular facet and then to hemispherical. The deposition rate and coating thickness were 300 μm/h and 615 μm, respectively, which is sufficiently rapid and thick enough to obtain free-standing SiC tubes for nuclear reactors.
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高影响因子
CARBON
·
2026
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IF 12.7
Huan Guo,Wenhao Dou,Ruifeng Li,Bingzhu Wang,Yonghui Yu,Yong She,Yongzhong Zhao,Jianjun Sha
It is crucial to address the challenges for low-temperature densification and interfacial reactions during the fabrication of multi-element ultra-high temperature ceramic matrix composites. In this paper, C sf /(Hf, Ta)B 2 -(Hf, Ta)C-SiC composites were prepared via reactive hot-press sintering at low temperatures. The intrinsic connection between the fiber content, microstructure, and mechanical behavior of the composites was elucidated. The results indicated that the ultrasonic dispersion combining with fast hot-press sintering effectively promoted the uniform dispersion of C sf in the matrix and achieved densification at 1700 °C. The composites exhibited an undamaged fiber-matrix interface without observable interfacial phase, demonstrating that low-temperature preparation effectively prevented fiber degradation from interfacial reactions. Compared to the unreinforced ceramics, the composites showed decreased flexural strength and fracture toughness, yet possessed higher work of fracture and larger critical crack size. This indicated that fiber addition improved the damage tolerance and structural reliability by inhibiting the catastrophic brittle fracture behavior inherent to monolithic ceramics. The composite with 20 vol% C sf offered the best balance of strength, toughness and non-catastrophic failure behavior. The flexural strength and fracture toughness were 260.6 MPa and 4.82 MPa m 1/2 , respectively. Download: Download high-res image (531KB) Download: Download full-size image
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高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Yan Liang,Yongqing Wang,Junjie Qian,Mingmin Bai,Yulong Yang,Ruiqiang Yang,Long Cheng,Yue Cha
In this study, in-situ growth of columnar mullite reinforced silicon carbide porous membrane supports were prepared, and the addition of TiO 2 helped to reduce the sintering temperature for the anisotropic growth of necked columnar mullite crystals. The synthesis of in situ columnar mullite makes reasonable use of the oxidized silica of silicon carbide, and in turn reduces the loss of the silicon carbide porous membrane support under strong corrosive conditions. The material showed a flexural strength of up to 72.95 MPa, and a water flux of 31612.83 L·m -2 ·h -1 ·bar -1 when sintered for 2 h in an air environment at 1250 °C. The flexural strength after corrosion in 20 vol% H 2 SO 4 and 1 wt% NaOH solution (90 °C) exceeded 93%. This shows that this porous silicon carbide ceramic membrane scaffold has potential applications in the field of water treatment under harsh environments.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Huan Guo,Bingzhu Wang,Ruifeng Li,Cheng Su,Jixiang Dai,Yong She,Yongzhong Zhao,Jianjun Sha
Low-temperature sintering and phase/microstructure tailoring of multi-element ultra-high temperature ceramics remain challenging, restricting the improvement of mechanical properties and the development of ultra-high temperature ceramic materials. In this work, a novel low-temperature reactive sintering technology was used to tailor the content of multiple borides and carbides in (Hf, Ta)B 2 -(Hf, Ta)C-SiC ceramics. It was found that the introduction of borides promoted the densification process of multi-phase ceramics. With the increase of borides content, the grain size of multi-phase ceramics gradually increased. The introduction of moderate amount borides helped to form a uniformly refined microstructure. When the molar ratio of borides to carbides was 2:1, the flexural strength and fracture toughness of multi-phase ceramics were the highest, which were 487.57 ± 38.3 MPa and 5.04 ± 0.09 MPa·m 1/2 , respectively. The main strengthening and toughening mechanisms included pullout of (Hf, Ta)B 2 grains and crack deflection.
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高影响因子
危险品化学品经营许可证（带存储）