JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yicheng Hou,Jun Qiu,Wei Wang,Xibo He,Zhen Wang,Yong Shuai
The development of high-temperature composite phase change materials (CPCMs) suitable for mass-production and high-performance is still a very urgent problem in the efficient utilization of renewable energy. In this study, a SiC spherical high-temperature CPCMs based on aqueous gel-casting suitable for batch molding using commercially available silicone molds is proposed. The porosity of the porous SiC framework can be adjusted by changing the content of starch granules in the slurry. The sample containing 20 wt% starch has relatively high open porosity and thermal conductivity , which is considered to be close to the optimal formulation of CPCMs. This formula possesses a high thermal conductivity of 10.2 W·m −1 ·k −1 benefiting from the continuous thermal transport channels consisting of the uniformly distributed large spherical pores and interconnected small pores. Meanwhile, the thermal storage density of the CPCMs reaches 395.21 J·g −1 in the temperature range of 550 ℃ and 750 ℃ since up to 89.06% of the pores are filled with molten salts. At the same time, the CPCMs exhibit excellent cycle stability in 100 thermal cycles. In particular, these CPCMs can be easily integrated into thermal energy storage (TES) system. Based on the rapid heat storage simulation of the C-D model, the packed-bed latent thermal energy storage system containing spherical CPCMs will have a more uniform temperature distribution and a 26.7% reduction in charging time compared with the traditional packed-bed system. This work provides a new reference for the design of spherical CPCMs in TES systems.
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高影响因子
ACS Applied Electronic Materials
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2023
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IF 4.7
Xintong Zhao,Wei Wu,Dietmar Drummer,Yi Wang,Sufei Cui,Chao Liu,Zijian Lu,Shuo Li,Qiming Chen
Thermal conductive composites have a wide application in the electronic packaging field, and fabricating three-dimensional (3D) graphene aerogels by the self-assembly method is a facile way to construct thermal conductive networks in polymer composites. But those self-assembled graphene aerogels can only endow composites with a limited thermal conductivity because (1) abundant defects on RGO sheets reduce their intrinsic thermal conductivity and (2) massive edges and gaps in aerogels cause severe phonon scattering. Many works before have been done to heal the defects by high-temperature annealing, but the works of filling gaps and decreasing phonon scattering are rare. Herein, we designed a facile route to synthesize SiC nanowires on the edges of RGO sheets for connecting adjacent RGO sheets, decreasing phonon scattering, and enhancing thermal conduction efficiency in graphene aerogels. Before that, RGO/Si aerogels with vertically aligned structures were obtained by the chemical reduction method and the freeze-drying method to enhance their through-plane thermal conduction efficiency. When the initial mass ratio of GO solute/silicon powder was 5:1, HGA-5 endowed the EP composite with a high through-plane thermal conductivity of 3.59 W m–1 K–1 at a relatively low filler loading of 2.87 wt %. Finite element analysis was applied to illustrate the thermal conductive mechanism of the hybrid aerogels-filled EP composites. The EMI shielding performance of the composites was also discussed in this work.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 19
·2300391
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IF 3.6
Yuting Duan,Jincui Ren,Chaofeng Lv,Xinyi Li,Yisheng Wu
ZrB 2 –SiC coatings are prepared on the surface of graphite by slurry brushing method to improve the oxidation resistance. Effects of ZrB 2 content and polyvinyl butyral (PVB)–ethanol solution concentration on microstructure and static oxidation behavior of the ZrB 2 –SiC coatings are investigated at 1200 °C in air. The results indicate that increasing ZrB 2 content improves the oxidation resistance of the coatings. When ZrB 2 content increases from 30 to 45 wt%, weight loss rates of the coated samples after oxidation at 1200 °C for 120 min decrease from −0.92% to −1.67%. Increasing binder solution concentration raises component content in the coatings. As PVB–ethanol binder concentration increases from 0.025 to 0.075 g mL −1 , weight loss rates of the coated samples after oxidation at 1200 °C for 120 min decrease from 0.32% to −0.38%. Excellent oxidation resistance of ZrB 2 –SiC coating is attributed to self-sealing ability of B 2 O 3 and borosilicate glass. The composite glass can inhibit oxygen diffusion by filling defects in the coating promptly. The borosilicate glass phase can enhance the fluidity of the composite glass. ZrO 2 and ZrSiO 4 particles restrict the growth of the microcrack, which improves the oxidation resistance of ZrB 2 –SiC coating.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
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IF 8.355
Xiaoxia Ou,Fotios Pilitsis,Yilai Jiao,Yong Zhang,Shaojun Xu,Martin Jennings,Yi Yang,S.F. Rebecca Taylor,Arthur Garforth,Huiping Zhang,Christopher Hardacre,Ying Yan,Xiaolei Fan
Structured Fe-ZSM-5 zeolite supported on silicon carbide (SiC) foam catalyst was develop and applied as the packed foam bed catalytic reactor (FBCR) to the liquid phase catalytic wet peroxide oxidation (CWPO) of phenol under flow conditions. Fe catalysts were uniformly incorporated into ZSM-5 coatings using chemical vapour deposition (CVD). Fluid flow analysis of FBCR was performed by varying liquid flow rate, showing the transition of reactor type from the plug flow reactor to the continuous stirred tank reactor at about 1 ml min −1 . Systematic investigation of CWPO within Fe-ZSM-5/SiC FBCRs identified the optimum condition of operating the FBCR (80 mm bed length) as at 60 °C and 1 ml min −1 with the turnover frequency (TOF) of 95 h −1 for phenol degradation (apparent activation energy = 3.4 kJ mol −1 ) and total organic carbon (TOC) conversion of 45.5%. It was believed that the enhanced macromixing promoted by cellular foam supports was accountable for the observed catalytic performance. The longevity of FBCR under flow conditions was also assessed, showing its good stability over 24 h, as well as the potential for practical adoption.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Dongyang Zhang,Ping Hu,Shun Dong,Cheng Fang,Jiaxin Feng,Xinghong Zhang
The C f /ZrB 2 -SiC composite was successfully fabricated via brushing nano ZrB 2 -SiC slurry followed by low-temperature hot pressing technique, in which the UHTC phases were uniformly introduced into intrafascicular space of the subdivided fiber bundles. The fabricated composite exhibited a non-brittle fracture behavior and excellent mechanical properties with a high work of fracture of 1338 J/m 2 , one order of magnitude higher than that of the ZrB 2 -SiC ceramic, which was attributed to the hybrid toughening mechanisms such as crack deflection, fiber bridging, fiber pull-out and crack branching. The fiber/matrix interfaces were analyzed by the high resolution transmission electron microscopy , and no obvious chemical reaction was detected, suggesting the degradation of carbon fiber was effectively inhibited. Moreover, the C f /ZrB 2 -SiC composite showed a good thermal shock resistance with a thermal shock temperature difference of 764 °C, almost twice those of the ZrB 2 -SiC ceramic. This work provides a facile and effective approach to fabricate high-performance continuous carbon fiber reinforced ceramic composites with uniform component distribution.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Yuan Cheng,Ping Hu,Wenzheng Zhang,Chen Ma,Jiaxin Feng,Qingpu Fan,Xinghong Zhang,Shanyi Du
The ZrC-SiC ceramics were introduced inside carbon fabric uniformly in one-step by vibration assisted injection. This novel method achieved a relative density of green body at 45%, nearly 50% higher than that of without vibration. The composite obtained a rivaling flexural strength at 185 ± 12 MPa, graceful fracture mode with fracture toughness at 5.86 ± 0.16 MPa∙m 1/2 and work of fracture reaching 1284 J/m 2 , 2 times of the value without vibration. By comparison, a poor fracture toughness and mediocre flexural strength of 4.05 ± 0.27 MPa∙m 1/2 and 113 ± 19 MPa are equipped with the non-vibration treated one.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Shun Dong,Wenzheng Zhang,Ping Hu,Yumin Zhang,Jiecai Han,Xiaoguang Luo
Nitrogen-doped SiC microparticles (SiCp) and SiC nanowries (SiCNWs) with different nitrogen contents were successfully synthesized by a simple and effective method, in which SiCp and SiCNWs were directly annealed in N 2 at 1500 °C with different holding times to adjust the contents of nitrogen for the first time. The nitrogen content of N-doped SiCp and SiCNWs increased with holding time, from 2.91 at.% and 3.05 at.% for 1 h to 5.05 at.% and 5.25 at.% for 4 h. The size of N-doped SiCp and SiCNWs was larger than that of pristine SiCp and SiCNWs, while the size tended to increase firstly and then decrease. The results of dielectric parameters showed that both real part ε′ and imaginary part ε ″ of permittivity of the samples increased greatly with increasing N contents in most frequency range, while two opposing trends for nitrogen content dependent microwave absorption property of N-doped SiCp and SiCNWs were observed. The electromagnetic (EM) wave absorption capability of N-doped SiCp was significantly improved with increasing nitrogen content compared with fully permeable wave pristine SiCp, and the minimum reflection loss (RL m ) and maximum effective absorption bandwidth (EAB) could be up to −33.5 dB and 4.4 GHz, respectively. The EM wave absorption performance of N-doped SiCNWs exhibited a decreasing tendency with increasing nitrogen content, and the RL m was decreased from −57 dB for pristine SiCNWs, to −51.2 dB for SiCNWs with 3.05 at.% N, and to −29.3 dB for SiCNWs with 5.25 at.% N. Moreover, if the experimental process in present study was decomposed into heat-treatment and N-doping, the heat-treatment played extremely negative effect on the EM wave absorption performance of samples, while N-doping still had positive impact on the EM wave absorption performance. It is believed that the current work will provide a new insight into the fabrication of SiC materials with fascinating properties by doping.
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高影响因子
Journal of Manufacturing Processes
·
2024
·
IF 6.1
Shihao Sun,Qian Xia,Zikang Li,Shuhan Wang,Ziru Pei,Yichen Xu,Hongqiang Ru
Novel light and strong hierarchical porous mullite-bonded SiC structures with total porosity ranging from 68 % to 95 % were fabricated by combining material extrusion (MEX) and in-situ reaction bonding technique. These structures comprise three porosity families and wide porosity hierarchization over four orders of magnitude in length scales. The pore parameters were precisely controlled by the nozzle path and starch (as a poreforming agent) content. The sintering temperature effect on phase composition, porosity, sintering shrinkage, and mechanical properties was systematically investigated. As the SiC powders were sintered at 1550 °C, they were compactly bonded by mullite and cristobalite necks. The single filaments demonstrated a flexural strength of 74 MPa at a porosity of 35 %. The hierarchical porous mullite-bonded SiC lattice structure with a total porosity of 69 % was near-net-shape sintered and exhibited a compressive strength as high as 41 MPa. Such structures are highly promising for wide applications such as electromagnetic shielding, burners, membrane supports, porous burners, filters, thermal insulation , catalyst supports, etc.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wen Yang,Chong Liu,Yongzhao Hou,Xiangjun Dai,Cheng Zhong,Yongqiang Ma,Meixian Jiang
In this work, a novel carbon-enriched SiC by the polymer derived ceramic (PDC-SiC) route was manufactured. By varying the branched chain of the preceramic polymer, the structure and electromagnetic properties of the obtained PDC-SiC ceramics can be effectively altered through carbon enrichment. Specially, PDC-SiC ceramics obtained from branched polysilylacetylene (PSA) constitute a composite material that contains nano-sized SiC grains, carbon nanotubes (CNTs), and silicon carbide nanowires (SiC nw ). Such PDC-SiC ceramics possess a complex three-dimensional network of CNT S /SiC nw , leading to remarkable microwave absorption properties. Notably, the PDC-SiC ceramics processed from dimethyl-polysilylacetylene (D-PSA) achieved a minimum reflection loss (RL min ) of −55.0 dB at 14.4 GHz, and an effective absorption bandwidth (EAB) extends across 5.5 GHz, with a thickness of 2 mm.
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高影响因子
ChemSusChem
·
2024
·
IF 7.5
Shuo Wang,Mengting Liu,Yarao Gao,Hongyao Zhao,Hongyang Zhu,Rongrong Du,Yuyang Zheng,Zengjing Guo,Yanyun Wang,Yiyan Song,Fu Yang
Graphical In this study, a bimetallic hollow nanoreactor (Co@SiO 2 /Cu−X) was designed for the efficient degradation of antibiotics in medical wastewater. This nanoreactor is composed of ultrafine Cu and Co metal species in a mesoporous N-doped C-Silica heteroshell, and the synergistic interaction between the different metal species and the structural properties of the nanoreactor make the catalyst afford remarkable catalytic activity and excellent recovery stability during norfloxacin mineralization. Moreover, the photothermal properties of the nanoreactor enable it to exhibit excellent performance in solar-driven water evaporation, providing a dual strategy for wastewater remediation and clean water regeneration. In the face of complex water pollution challenges, this innovative design provides a promising solution for advanced water purification technologies. Growing attention has been paid to the rational treatment of antibiotics-bearing medical wastewater. However, the complexity of polluted wastewater makes the later comprehensive treatment difficult only by the Advanced Oxidation Process technique. Therefore, the coupled water treatment techniques including contaminant mineralization and regeneration of cleanwater become very attractive. A bimetallic functional hollow nanoreactor defined as (Co@SiO 2 /Cu−X) was successfully constructed by coating a Cu-doped silica layer on the metal-organic framework (ZIF-67) followed by programmed calcination in nitrogen. The nanoreactor was endowed with a hollow configuration composed of mesoporous N-doping C-Silica hybrid shell encapsulated ultrafine Cu and Co metallic species. Such a configuration allows for the efficient diffusion and open reaction space of big contaminant molecules. The catalytic synergy of exposed Co−Cu bimetals and the easy accessibility of electron-rich contaminants by polar N doping sites triggered surface affinity make the optimal Co@SiO 2 /Cu-6 afford an excellent catalytic norfloxacin mineralization activity (7 min, k abs =0.744 min −1 ) compared to Cu-free Co@SiO 2 -6 (k abs =0.493 min −1 ) and Co-6 (k abs =0.378 min −1 ) Benefiting from the above unique advantages, Co@SiO 2 /Cu-6 show excellent removal performance in degrading different pollutants (carbamazepine, oxytetracycline, tetracycline, and bisphenol A) and persistent recycled stability in removing NFX. In addition, by virtue of the excellent photothermal properties, interfacial solar water evaporation application by Co@SiO 2 /Cu-6 was further explored to reach the regeneration of cleanwater (1.595 kg m −2 h −1 , 97.51 %). The integration of pollutant mineralization and solar water evaporation by creating the monolith evaporation by anchoring the Co@SiO 2 /Cu-6 onto the tailored melamine sponge allows the regeneration of cleanwater (1.6 kg⋅m −2 ⋅h −1 ) and synchronous pollutant removal (NFX, 95 %, 60 min), which provides potential possibility the treatment of complicated wastewater.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Zhixiao Zhang,Chongjun Xu,Xianwu Du,Zili Li,Jilin Wang,Weihong Xing,Yuan Sheng,Weimin Wang,Zhengyi Fu
High-performance TiB 2 –SiC composites were fabricated with a new reaction system of B 4 C–TiC–Si by reactive hot pressing. The reaction process was controlled by the diffusion of boron atoms and hindered by the accumulated product layer of TiB 2 and C. The melting Si can offer another diffusion path for boron atoms, thereby promoting the reaction process. The Vickers hardness , flexural strength , and fracture toughness of the fabricated TiB 2 –SiC composites respectively reached 28.6 ± 0.6 GPa, 654 ± 49 MPa, and 6.8 ± 0.5 MPa m 1/2 . Both the intergranular fracture resulting from mismatch in thermal expansion coefficient between TiB 2 and SiC and the transgranular fracture resulting from the network structure of TiB 2 can enhance the fracture toughness of the TiB 2 –SiC composite.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2014
·
IF 2.307
Yinsheng Li,Jie Yin,Haibo Wu,Ping Lu,Yongjie Yan,Xuejian Liu,Zhengren Huang,Dongliang Jiang
In order to attain high thermal conductivity , SiC was doped with ultra-low amounts of B and C as sintering additives using boric acid together with d -fructose as boron–carbon sources. The contents of in situ generated B and C were both tailored as low as 0.4 wt.%, which can significantly reduce the impurities induced phonon scattering effect. The SiC ceramics were pressureless densified at 2150 °C for 1 h, and some samples experienced subsequent annealing at 1950 °C for 4 h. High thermal conductivities of 180.94 W/(m K) for the as-sintered SiC ceramics and 192.17 W/(m K) for the annealed specimens at room temperature were achieved. The reasons for the high thermal conductivity in the polycrystalline SiC ceramics were specified, based on the close correlation with microstructure.
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高影响因子
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