MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Andong Hua,Yishi Su,Yunpeng Cai,He Cao,Kan Liu,Lichaoran Guan,Di Zhang,Qiubao Ouyang
A novel strategy of multistep ball milling was used to tune the multimodal grain structure in B 4 C microparticles and SiC nanowires hybrid reinforced 2024Al matrix composites (B 4 C/SiC/2024Al composites). During the ball milling process, SiC nanowires and 2024Al powders were added step by step, multimodal grain structure was achieved by different ball milling time. Then B 4 C microparticles were added and ball milled to achieve uniform dispersion of B 4 C microparticles and SiC nanowires. Multimodal grain structure was maintained in the subsequent preparation processes. Balanced strength and ductility were achieved in trimodal coarse grain (CG)/ fine grain (FG)/ ultrafine grain (UFG) structure, which exhibited yield strength of 616.7 ± 8.1 MPa, ultimate tensile strength of 714.6 ± 2.1 MPa and fracture elongation of 2.68 ± 0.12% with a comparable strength but doubled ductility as that in unimodal UFG structure. Significant toughening effect was achieved in the trimodal grain structure, which could be attributed to the hetero-deformation induced (HDI) hardening effect and the energy dissipation mechanism caused by the formation of a large number of SFs and the blunting effect of CG(FG) zones on crack tips. Therefore, multistep ball milling and powder metallurgy were confirmed an effective way to tune and fabricate multimodal grain structure with balanced strength and ductility in metal matrix composites .
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Ziming Shen,Jiachun Feng
Pre-constructing vertically aligned 3D thermally conductive fillers networks via unidirectional freeze casting method to prepare polymer composites with high through-plane thermal conductivity (TC) has recently attracted much attention. Here we proposed a strategy to fabricate anisotropic silicon carbide microwires (SiCMWs) networks in a uniform cold environment. The key point of our strategy was to design and make the anisotropic molds composed of materials with very different TC. We used a cuboid mold made of alumina sheets as top and bottom and PVC foam plates as side surfaces to fabricate vertically aligned SiCMWs networks in a cryogenic refrigerator. After impregnating of the networks into epoxy matrix , the obtained composites exhibited significant TC enhancement at an ultralow loading. The composite containing only 1.32 vol % of SiCMWs had a TC value of 0.62 W/(m K), which was 3.9 and 2.3 times that of pure epoxy and epoxy composite with random SiCMWs, respectively. Moreover, utilizing our method, the 3D networks with different orientation direction, dimensions or shapes could be also easily prepared only by designing and utilizing different molds.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Bin Du,Changqing Hong,Xinghong Zhang,Jiazhi Wang,Qiang Qu
Carbon-bonded carbon fiber (CBCF) composites are novel and important high-temperature insulation materials owing to their light weight, low thermal conductivity and high fracture tolerance. To further improve the mechanical property of CBCF composite, we propose a three-dimensional (3D) SiC nanowires structure, which is in situ grown on a CBCF matrix via directly annealing silicon oxycarbide (SiOC) ceramic precursor. The synthesized multiscale reinforcements including microscale SiOC ceramics and nanoscale SiC nanowires are mainly attributed to the initial phase separation of SiOC phase and subsequent solid-phase reaction of SiO and C phases. Compared to SiOC/CBCF composite, the resulting 3D SiC nanowires/SiOC/CBCF hybrid structure exhibited high flexural/tensile strength and fractured strain due to the pull-out and bridging behavior of SiC nanowires. This one-step process supplied a feasible way to synthesize 3D SiC nanowires to reinforce and toughen SiOC-modified CBCF composite.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiankai Hu,Daili Feng,Wenjun Li,Jianyin Miao,Yanhui Feng
The integration of phase change material (PCM) into aircraft thermal protection system (TPS) can dissipate aerodynamic heat by utilizing its sensible and latent heat, but there is a problem of leakage. Porous SiC ceramics with high-temperature resistance and low thermal conductivity are utilized to encapsulate high latent heat PCM, solving leakage issues and mitigating the high-temperature aerodynamic heating environment experienced by aircraft. In this study, low thermal conductivity porous SiC ceramics were prepared, where the addition of SiO 2 in the skeleton led to a 36% reduction in thermal conductivity, while the mechanical properties were improved by 129%. After loading the PCM, the thermal conductivity of the composite was only 0.402 W/(m·K), while the latent heat reached up to 231.07 J/g. Aircraft is subjected to space particles when serving in the space environment, therefore the effects of 60 Co γ-ray irradiation on composite PCMs were investigated. The results showed that irradiation induced a small number of point defects in the skeletons, which caused phase changing polyethylene glycol (PEG) molecular chain breakage and the production of new compounds, thereby inducing a decrease in the latent heat of the PEG composites, whereas there was no significant effect on the phase changing mannitol (Man) composites. This study may provide guidance for the application of composite PCMs in TPS.
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Small
·
2024
·
IF 13
Hulin Wang,Weijun Li,Marko Gloginjić,Srdjan Petrović,Tetyana V. Krupska,Vladimir V. Turov,Jialong Zhao,Weiyou Yang,Zhentao Du,Shanliang Chen
Emerging photoelectrochemical (PEC) photodetectors (PDs) have notable advantages over conventional PDs and have attracted extensive attention. However, harsh liquid environments, such as those with high corrosivity and attenuation, substantially restrict their widespread application. Moreover, most PEC PDs are constructed by assembling numerous nanostructures on current collector substrates, which inevitably contain abundant interfaces and defects, thus greatly weakening the properties of PDs. To address these challenges, a high-performance pH-universal PEC ultraviolet (UV) PD based on a whole single-crystal integrated self-supporting 4 H -SiC nanopore array photoelectrode is constructed, which is fabricated using a two-step anodic oxidation approach. The PD exhibits excellent photodetection behavior, with high responsivity (218.77 mA W −1 ), detectivity (6.64 × 10 13 Jones), external quantum efficiency (72.47%), and rapid rise/decay times (17/48 ms) under 375 nm light illumination with a low intensity of 0.15 mW cm −2 and a bias voltage of 0.6 V, which is fall in the state-of-the-art of the wide-bandgap semiconductor-based PDs reported thus far. Furthermore, the SiC PEC PD exhibits excellent photoresponse and long-term operational stability in pH-universal liquid environments. The improved photodetection performance of the SiC PEC PD is primarily attributed to the synergistic effect of the nanopore array structure, integrated self-supporting configuration, and single-crystal structure of the whole photoelectrode.
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PubMed
高影响因子
CARBON
·
2024
·
IF 10.5
Hui Zhu,Bo Liu,Jiawang Hou,Ruiqi Wang,Ye Cong,Zhijun Dong,Baoliu Li,Jianguang Guo,Xuanke Li
Developing a nanoscale secondary thermal conduction network within carbon fiber performs is a challenging yet effective method to substantially enhance the thermal conductivity of C/C composites. In this study, a strategy for creating a three-dimensional (3D) SiC nanowires (SiCNWs) thermal conductivity network in carbon felts (CFs) was implemented using vacuum thermal evaporation technology to fabricate SiCNWs modified C/C composites (SiCNW–C/C). The growth mechanism of SiC nanowires within CFs and their impact on the microstructure and thermal conductivity of the C/C composite were thoroughly investigated. The findings indicate that a SiC nanowires thermal conduction network can be successfully established within carbon felts without catalysts by initiating nucleation sites and managing reaction pressure. An appropriate reaction pressure is crucial not only for the uniform growth of SiC nanowires but also as a key factor in modulating the content and microstructure of the SiC nanowires. SiC nanowires prepared at 150 Pa exhibit minimal structural defects and are evenly distributed throughout the carbon felts, markedly enhancing the thermal response rate of the felts. The thermal conductivity of these SiCNW-modified C/C composites, both parallel and perpendicular to the carbon fibers, increased to 173 W/m•K and 112 W/m•K, respectively, approximately tripling that of the pure C/C composite. The exceptional thermal management capabilities of SiCNW–C/C were empirically validated through simulated operational chips and finite element simulation. This work presents an effective approach for producing C/C composite with high thermal conductivity particularly through the thickness, offering promising applications in the thermal management of advanced electronics.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 3
·e70151
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IF 3.4
Kaijun Yu,Fanmin Kong,Guodong Jiang
Due to low surface energy, high chemical inertness, and poor interfacial properties of ultra-high molecular weight polyethylene (UHMWPE) fibers, it was difficult to achieve good adhesion with the matrix interface. Surface coating modification based on polydopamine (PDA) was widely applied to build high-performance and specifically functional surface modifications. In order to improve the interfacial adhesion between UHMWPE fibers and epoxy resin, this study used a one-step process with ammonium polyphosphate (APP) as a template to deposit a hybrid coating of PDA and N -(2-aminoethyl)-3-aminopropyltrimethoxysilane (KH792)/3-aminopropyltriethoxysilane (KH550)/nano silicon carbide (SiC) on the surface of UHMWPE fibers. Additionally, corona treatment was applied to increase oxygen-containing functional groups on fibers while also improving the processing technology of composites. Due to the polymerization of PDA, the deposition of SiC, and the hydrolysis-condensation of silanes, the nanohybrid coating can provide rich connection points and nanoparticles for hybrid fabrics without affecting the inherent strength of fibers. Corona improved surface roughness, and hybrid coatings enhanced the interfacial adhesion between the resin matrix and fibers. The UHMWPE fiber/epoxy composite material after improved composite technology exhibited excellent mechanical properties. Compared with untreated composite laminates, interfacial shear strength (IFSS) was increased by 88.81%, flexural strength was enhanced by 87.89%, impact strength was improved by 64.39%, and tensile strength was raised by 26.58%. The study showed that the nanohybrid coating co-deposited with PDA and corona enhanced the interfacial bond between epoxy resin and UHMWPE fibers, increased relative friction at the fracture interface, and improved load transfer between UHMWPE fibers and matrix.
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COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Liang Zhou,Jianbao Hu,Wang Yuan,Feiyan Cai,Xiao You,Yanmei Kan,Yan Zhang,Xiangyu Zhang,Jinshan Yang,Xiaowu Chen,Shizhi Wu,Shaoming Dong
To enhance the service life and reliability of SiC f /SiC composites after EBCs exfoliation, an integrated design concept is proposed to use Si reactive melt infiltration to prepare integrated EBC- SiC f /SiC composites in this work. It can form a quasi-EBC layer with EBC components on the surface of SiC f /SiC composites. The integrated structure has stronger bonding strength than the conventional coating and matrix. During thermal shock cycling, its thermal shock resistance can be enhanced by consuming SiO 2 to form Yb 2 Si 2 O 7 with good damage tolerance. Meanwhile, the presence of quasi-EBC layer is expected to provide secondary protection for SiC f /SiC composites after conventional EBC stripping, which can improve the service life of SiC f /SiC composites. This work provides a new idea for the long-life modification of SiC f /SiC composites.
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-20
·
IF 26.6
Sun Changlong,Xu Xin,Gui Cenlin,Chen Fuzhou,Wang Yian,Chen Shengzhou,Shao Minhua,Wang Jiahai
The intimate NG@SiC heterostructure has been constructed via a direct thermal decomposition method.
The NG@SiC heterostructure anode delivers enhanced capacity and cycling stability both in the half-cell and in the full cell.
DFT analysis reveals that this NG@SiC anode possesses lower lithium-ion adsorption energy and higher charge and discharge rates.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Mujeeb Alam,Danping Jiang,Huan Zhang,Lei Zhang,Faiqa Nadeem,Nadeem Tahir,Chaoyang Lu,Quanguo Zhang
Photo-fermentation offers a promising roadmap for hydrogen production through their ability to harness light energy, however, its lower conversion efficiency is the major bottleneck for its realization. This study investigates the catalytic role of wideband gap nano-photocatalysts (SiC, ZnO, and SnO 2 ) in enhancing hydrogen generation from Arundo donax L. Physio-optical characteristics of SiC, ZnO, and SnO 2 nano-photocatalysts were assessed through SEM, XRD, and FT-IR which confirmed that incorporated nano-photocatalysts are spherical with uniform size distribution and there is no secondary phase. Hydrogen production experiments with varying nano-photocatalyst concentrations revealed that the maximum hydrogen yield of 104 and 98.83 mL/g was achieved with SiC and ZnO, respectively, at loading concentration of 200 mg/L, whereas 69.30 mL/g were observed with 100 mg/L of SnO 2 . The incorporation of SIC, ZnO, and SnO 2 nano-photocatalyst permitted to increase the hydrogen content in overall gas production by 41 %, 37.34 %, and 18.26 % as compared to the control group. The increase in hydrogen production is related to the enhanced e-h pair separation lifetime of SiC, confirmed from PL spectroscopy. Addition of SiC caused a longer availability of electrons that helped to increase the metabolic rate by 38 % and 40.29 % in energy conversion efficiency (ECE). ANOVA results revealed significant differences between the control and maximum values of CHP, HC%, byproducts, and ECE. Tukey pairwise comparisons showed that SiC and ZnO had non-significant differences at 200 mg/L but both significantly outperformed SnO 2 at 100 mg/L. Thus, the selection of suitable catalysts photocatalysts with enhanced e-h pair separation lifetime may offer promising prospects for sustainable energy technologies by enhancing biohydrogen production.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mian Yang,Kaihua Chen,Shenghui Guo,Ming Hou,Jiyun Gao,Junwen Zhou,Shuhao Shi,Li Yang
In this paper, the self-propagating reaction of the Ti–SiC–C system for synthesising Ti 3 SiC 2 -based diamond composites is ignited by the combustion of Ni–Al alloy powders in a microwave field. The heating curves of Ni–Al-assisted microwave sintering show that the self-propagating reaction could be successfully ignited after heating samples to 685.2 °C in a microwave field for 456 s. This finding indicates that ignition could occur at temperatures below the diamond graphitisation temperature (727 °C). X-ray diffraction analysis indicates that the sintered samples primarily comprise Ti 3 SiC 2 , TiC, Ti 5 Si 3 and C. Scanning electron microscopy coupled with energy dispersive spectroscopy observations demonstrates that the diamond grains are tightly bonded with the surrounding matrix and are intact. The best wear ratio of 302.26 was obtained for the Ti 3 SiC 2 -bonded diamond composite when the diamond grain size was 140/170 mesh and the molar ratio of Ti, SiC and C was 3:1.1:0.9.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Yuanming Zhou,Shuxin Li,Shuangxing Zhu,Ruizhi Liu,Zhenxiao Tang,Maozhong Yi,Ke Peng
To investigate the influence of (Ta,Zr)C on the ablation resistance of C/C composites, C/C-(Ta 0.5 Zr 0.5 )C-SiC, C/C-(Ta 0.33 Zr 0.67 )C-SiC, and C/C-(Ta 0.2 Zr 0.8 )C-SiC were prepared with different Zr/Ta ratios through high-solid-loading slurry impregnation combined with precursor infiltration and pyrolysis. The flexural performance and ablation resistance both improved with an increasing Zr/Ta ratio. Compared to C/C-(Ta 0.5 Zr 0.5 )C-SiC and C/C-(Ta 0.33 Zr 0.67 )C-SiC, the flexural strength of C/C-(Ta 0.2 Zr 0.8 )C-SiC increased by 74.17 % and 24.29 %, respectively. The mass ablation rate was reduced by 74.33 % and 81.02 %, while the linear ablation rate was reduced by 98.60 % and 97.65 % after 120 s of ablation, respectively. The variations in Zr/Ta ratios affected the formation, integrity, and performance of the microstructure, which was composed of a Zr-rich oxide skeleton combined with Ta-rich oxide binder within the Ta-Zr-O oxide layer on the composite surface, ultimately enhancing the overall ablation resistance of these composites.
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