Materials Today Energy
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2024
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IF 9
Zongliang Kou,Kai Liu,Zhenyu Zhao,Hong Li,Xin Gao
Metal-organic framework (MOF) materials with loaded catalysts have recently garnered substantial interest in the catalysis field. However, the catalytic performance of MOF catalysts is hindered by particle aggregation. This study introduces a microwave-assisted anchoring strategy to improve the dispersion of UIO-66-NH 2 on SiC surfaces. The dispersion can be effectively controlled by varying the SiC carrier content. Scanning electron microscopy and transmission electron microscopy analyses show that as the SiC content increases from 2% to 10%, MOFs exhibit a more dispersed distribution on the surface. This is exemplified in the esterification reaction between acetic acid and cyclohexene , where a higher MOF dispersion leads to a conversion rate boost from 70% to 75%. Numerical simulations reveal that microwave's selective heating property plays a crucial role in achieving this enhanced dispersion. This work contributes a systematic approach to enhance MOF dispersion and advances the development of structured catalysts based on MOFs.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Zhouxi Tan,Mingkang Zhang,Shuai Zhao,Yihua Huang,Zhengren Huang
Low strength and poor performance of SiC–WC composite for seals, attributable to the use of a large amount of liquid phase sintering additives, limit the application prospects of these materials. This study focuses on preparing high-strength, high-toughness, and wear-resistant SiC–WC composite using a small amount of aluminum and carbon black as sintering additives. The results revealed that the specimen containing 50 wt% WC exhibited the maximum flexural strength and fracture toughness of 645.9 MPa and 7.49 Mpa m 1/2 , respectively. These improvements were attributed to the deoxidizing and solid-solution effects of Al and the reinforcing effect of the WC second phase. Moreover, the specific wear rate was measured at 8.06 × 10 −7 mm 3 N −1 m −1 , which was 56.9 % lower than that of monolithic SiC. Results from Raman spectral analysis provided evidence of the presence of W–O bonds on the wear surface, indicating that the SiO 2 film could be successfully replaced by a WO 3 film.
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高影响因子
LANGMUIR
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2024
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IF 3.7
Xin Song,Boyu Hu,Jiani Guo,Renke Kang,Shang Gao
Single-oxidant slurries are prevalently utilized in chemical and mechanical polishing (CMP) of 4H-SiC crystal. Nevertheless, it is a challenge to achieve a high material removal rate (MRR) and surface quality using single oxidant slurries to meet the needs of global planarization and damage-free nanoscale surface processing of SiC wafers. To solve this challenge, a novel method is proposed for SiC CMP processing using the double oxidant slurry. This slurry mainly consists of alumina (Al2O3) abrasive particles, potassium permanganate (KMnO4), potassium persulfate (K2S2O8), and deionized water. Post CMP, MRR is 1045 nm/h calculated by scratch method, and surface roughness Sa is 0.33 nm measured by 3D optical surface morphometer, with the measurement area of 868 μm × 868 μm. Both the MRR and Sa are far better than those under the single oxidant slurry condition. CMP mechanism with double-oxidant slurry conditions is elucidated by energy dispersive spectrometer and X-ray photoelectron spectrometer. Initially, the Si–C bond on the SiC wafer surface was oxidized by KMnO4, then MnO2 as the reduction product of KMnO4 can also catalyze the S2O82– to further oxidize SiC wafer surface, and eventually the oxidation layers were removed by mechanical action of nano-Al2O3 abrasive particles during CMP processing. These findings offer a pioneering approach and novel perspectives to achieve a higher MRR of 4H-SiC CMP, with potential implications for the application in high-performance SiC devices.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Qingyuan Cao,Hanqi Qian,Tao Liu,Nan Li,Yudong Huang,Dawei Jiang,Bo Jiang
Polymer-derived ceramics (PDCs) endowed with outstanding mechanical properties, chemical and thermal resistance are highly demanded for applications in extreme environments, whereas their practical applications have constantly been constrained by structural collapse and the brittle nature of ceramics at high temperatures. A novel methodology was proposed to boost the growth efficiency of SiC nanowires by one-step pyrolysis prepared heterostructure promoter in situ during the process of PDCs. The quantity and dispersibility of heterogeneous promoter have been markedly enhanced through one-step pyrolysis. Furthermore, the heterostructure promoter prepared via ligand exchange between ferrocene and Zr atoms exhibited nano-flower structure and greater specific surface area, thereby possessing higher adsorption capacity for reaction intermediates by providing more reaction sites. This was accountable for the enhancement of growth efficiency of nanowires and gave rise to the formation of a crack-free ceramics phase with higher strength, lower brittleness and multifunctionality. The yield of ceramics attained 87.84% under the impact of the heterogeneous promoter. In contrast to other promoter, heterogeneous promoter was capable of promoting a greater number of SiC nanowires with higher aspect ratios and more homogeneous distribution. Furthermore, SiC nanowires featuring core-shell structure were grown in hybrid resin by heterostructure promoter during the process of PDCs. The successful fabrication of this heterogeneous promoter offered a promising perspective for the emerging responsive ceramifiable technology.
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高影响因子
RENEWABLE ENERGY
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2024
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IF 9
Qiang Chen,Yixuan Dong,Jing Ding,Weilong Wang,Jianfeng Lu
Solar energy is an abundant renewable energy source, and the use of solar energy for carbon dioxide reforming of methane (CRM) is a promising thermochemical energy storage scheme, but the reactor using the traditional powder catalyst has the disadvantages of complex encapsulation and low energy storage efficiency. In this paper, porous SiC-foam with high thermal conductivity is used to prepare Ni/CeO 2 –Al 2 O 3 /SiC catalyst, and then is loaded into a cavity reactor to achieve highly efficient and stable CRM under solar simulator. After a period of reaction, methane conversion rate remains high. As inlet flow rate decreases and incident energy flux rises, methane conversion rate is improved, and thermochemical energy storage efficiency first rises and then drops with maximum 31.4%. The numerical model of the cavity reactor under concentrated heat flux is established, and the simulation results are in good agreement with the experimental data. The structure of catalyst bed directly influences the heat storage performance, and the optimal bed thickness, radius and porosity are obtained. For thick bed, the reverse reaction appears in the end region of the bed, and then this region expands with bed thickness rising, so the reaction rate first increases and then decreases.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2024
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IF 8.1
Pan He,Yuelei Pan,Mingyuan Yan,Lunlun Gong,Long Shi,Xudong Cheng,Heping Zhang,Junchao Zhao
Silicon Carbide (SiC) aerogel is a material with 3D network structure, low density, and high-temperature resistance, showing a broad application potential in various areas. It is currently challenging for SiC aerogels to balance the mechanical and high-temperature insulation properties. Here, a novel strategy was implemented for the first time, by constructing coaxial precursors. This structure can achieve in-situ Si-C binding and maximization the reaction sites to achieve fibers growth uniformly. The sintering time is reduced by over 90%. The fatigue resistance and elastic properties of the SiC aerogel were significantly improved. In addition, the uniform nanowire fiber and pore structure enable an ultra-low thermal conductivity of 0.018 W/(m K) at room temperature, 0.082 W/(m K) even at 900 °C, and superior structural stability at 1400 °C. Our strategy provides a feasible approach for the structural design of thermally insulated SiC aerogels with high elastic resilience and good adsorbability.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
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IF 3.8
Yongsheng Liu,Guoxin Wei,Yawen Ma,Pengcheng Ma,Jianyong Tu,Jingxin Li,Yansong Liu,Shaolin Fu,Yejie Cao,Jian Chen,Yu Pan
In response to the urgent demand for ablation resistance and cost-effective thermal protection materials for hypersonic vehicles, this study employed a combined process of slurry injection and reactive melt infiltration to rapidly fabricate C f /ZrB 2 ‒SiC composites. The effects of infiltration temperature (1450°C‒1600°C) and holding time (0.5‒2.0 h) on the microstructure and mechanical properties were systematically investigated. Results demonstrate that at 1500°C, the competition mechanism between molten Si viscosity and reaction rate was balanced, achieving efficient pore filling. Composites processed at 1500°C for 1 h exhibited optimal mechanical properties, with a flexural strength of 234.08 MPa. As the holding time increased, elemental homogeneity improved in the matrix while mechanical properties decreased. The oxyacetylene ablation test (4.18 MW/m 2 ) showed: at 100 s, a dense ZrO 2 ‒SiO 2 oxide layer formed, resulting in ablation rates of 0.32 mg/s and 0.70 µm/s. After 300 s, thermal stress caused oxide layer spallation, elevating rates to 2.90 mg/s and 4.50 µm/s, triggering a new ablation cycle. The material demonstrates exceptional ablation resistance. This process provides a valuable reference for the low-cost fabrication of high-performance ultra-high temperature ceramic matrix composites.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Wenkang Zhang,Qiqi Yang,Qilin Gu,Zheng Liang,Zhijun Xu,Zhaoxiang Zhong,Weihong Xing
Ceramic membranes ultrafiltration (UF) has emerged as a promising alternative to the conventional clarification technology in sugarcane juice clarification industries, given their efficient and eco-friendly separation processes based on the size sieving effect. However, the upscaling application of ceramic UF membranes is still limited by their low permeate flux, high energy consumption and severe membrane fouling. Herein, to utilize the interactions at the interfaces, tubular SiC microfiltration (MF) membranes with special surface wettability were deliberately tailored through a novel penetration pressure counter-balanced crossflow method using 1H, 1H, 2H, 2H-perfluorooctyltrichlorosilane as a hydrophobic agent. The effect of an out-layer pressures (0-4.0 kPa) and flow rate (1.4-2.4 mL·s -1 ) on surface wettability of membranes were studied, and those obtained membranes were applied in sugarcane juice clarification. The wettability, functional groups, binding energy, chemical compositions, and microstructure of modified SiC membranes were analyzed to elucidate their wettability-performance relationships. The performance of modified SiC MF membranes in sugarcane juice clarification were mainly evaluated by the flux decline profiles and permeate solution turbidity. The SiC membrane with hydrophobic inner wall (WCA=142°) and hydrophilic outer surface (WCA=0°) were achieved at out-layer pressure of 2.0 kPa and flow rate of 1.9 mL·s -1 . The results show that the SiC membrane with such asymmetric wettability exhibited ultra-high stable permeate flux (844 L·m -2 ·h -1 ·bar -1 ), satisfactory turbidity reduction rate (95.7%), and relatively low flux decreased rate (64.4%). The improved antifouling performance can be primarily attributed to the hydrophobic inner wall, and negatively charged pore wall. This work primarily demonstrates the application potential of ceramic MF membranes with asymmetric wettability for the effective sugarcane juice clarification.
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高影响因子
CERAMICS INTERNATIONAL
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2025
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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.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
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IF 3.8
Yingjun Liu,Yuanzhe Fu,Yufei Zu,Yang Zhang,Hongfeng Dong,Wenhu Li,Taotao Ai,Jianjun Sha
The relationship between the interfacial bonding properties and the mechanical properties of carbon fiber reinforced ZrB 2 –ZrC–SiC composites (C f /ZrB 2 –ZrC–SiC) is currently under investigation. In this study, C f /ZrB 2 –ZrC–SiC composites with varying fiber–matrix interfacial bonding properties were prepared using slurry infiltration and in-situ reactive hot pressing. Polydopamine-derived carbon with different thicknesses was employed as the interphase to create various interfacial bonding properties, where interfacial bonding properties were evaluated using the single-fiber push-out method. Results indicated that a uniform and dense ZrB 2 –ZrC–SiC matrix was constructed, and low-porosity composites without fiber degradation were obtained. For composites with a higher interfacial shear strength (ISS) of 342 MPa, flexural strength and fracture toughness were 209 MPa and 7.5 MPa·m 1/2 , respectively. For composites with a lower ISS of 64 MPa, flexural strength and fracture toughness increased by 41% and 13%, with showing non-brittle behavior and work of fracture up to 10 kJ·m 2 . By combining analyses of thermal expansion behavior, residual thermal stresses, and thermal shock properties at ultrahigh temperatures, thermal mismatch and thermal damage can be minimized through the modulation of ISS. This approach is beneficial for optimizing the mechanical properties of fiber-reinforced ceramic composites.
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高影响因子
Materials Today Communications
·
2025
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IF 4.5
Changjiang Xiao,Haoyu Zheng,Xiang Li,Lihui Tang
In order to achieve dense SiC ceramics with better properties, SiC w /SiC ceramics without additives were prepared by high-temperature (1450 °C) and high-pressure (5.5 GPa) (HTHP) sintering using SiC whiskers (SiC w ) as a reinforcing phase. The high pressure causes the sintering temperature to be significantly reduced and the sintering time to be greatly shortened. A comprehensive analysis was conducted to elucidate the effect of SiC w content on the structure and mechanical properties of SiC ceramics. As the SiC w content increases, the properties of SiC w /SiC ceramics first improved and then decreased. At 5.0 wt% SiC w , there is the best bonding state between SiC whiskers and SiC matrix, therefore, SiC w /SiC ceramics exhibit the highest relative density of 99.08 %, maximum Vickers hardness of 23.02 GPa and fracture toughness of 9.02 MPa⋅m 1/2 . The main toughening mechanisms are assumed to be the crack deflection, bridging effect and pull-out of whisker.
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高影响因子
International Journal of Extreme Manufacturing
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2025
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IF 21.3
Piao Qu,Guozhen Liang,M. Irfan Hussain,Muhammad Hanif,Muhammad Hamza,Kaibin Huang,Yan Lou,Zhangwei Chen
The combination of silicon carbide (SiC) ceramics and stereolithography technology has the potential to manufacture complex-shaped SiC components, thereby expanding application possibilities. However, the high sintering temperature and structural-performance anisotropy of three dimensional (3D)-printed SiC components have limited their practical use. Herein, a novel method is introduced to produce high-specific-strength SiC-based ceramics at a relatively low temperature of 1100 °C. To enhance ultra violet (UV) light penetration in the SiC slurry, a mixed SiC/SiO2 slurry (30% SiO2 and 70% SiC by volume) with a solid loading of up to 40% was prepared, improving printability. Additionally, a high methyl-phenyl-polysiloxane (PSO) solution content (75% of liquid resin weight) was incorporated to enable the low-temperature pyrolysis of SiC/SiO2/PSO ceramics. The resulting pyrolyzed SiC/SiO2/PSO lattice ceramic exhibited a high specific strength of 1.03 × 105 N·m/kg with a density of 1.75 g/cm3, outperforming other SiC-based lattice structures with similar porosity. The bending strength of SiC/SiO2/SiOC ceramics reached 95.49 ± 8.79 MPa, close to some of those prepared at temperatures of 1400 °C and above). Notably, the addition of the silicon carbide oxide (SiOC) phase to the SiC/SiO2 ceramics significantly reduces anisotropy, lowering the transverse and longitudinal compression strength ratios from 1.87 to 1.08, achieving 79% compensation in mechanical properties. This improvement is attributed to the cohesive force of SiOC shrinkage, promoting a uniform distribution of sintered components, resulting in a more robust and balanced material structure. This method offers valuable insight into the additive manufacturing (AM) of SiC-based ceramics at lower temperatures and provides new guidance for controlling anisotropy in 3D-printed ceramic parts.
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高影响因子
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