JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Baojie Zhang,Zongwei Tong,Huijun Yu,Hui Xu,Zhiwei Chen,Xiaolei Li,Huiming Ji
Silicon carbide (SiC) fibers have excellent high temperature resistance and chemical stability in extreme environment. However, the practical application of SiC fibers have been limited by their high intrinsic thermal conductivity . Herein, the novel ZrO 2 /SiC-based nanofiber membranes with high temperature resistance and low thermal conductivity were prepared for the first time using simple blending method via electrospinning technique combined with subsequent curing and pyrolysis. The microstructure, composition, high temperature resistance and thermal insulation mechanisms were analyzed in detail. The results showed that the introduction of Zr could significantly improve the high temperature resistance of the nanofibers up to 1400 °C, at the same time, the multi-phase microstructure (SiOxCy, ZrO 2 , β-SiC and residual carbon) endows it with ultralow thermal conductivity at high temperature (0.217 W m -1 K -1 at 1300 °C). Compared with the reported thermal insulation materials, this work not only prepares thermal insulation materials with higher temperature resistance, but also provides a new perspective for the research of SiC-based nanofibers in the field of thermal insulation.
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高影响因子
CERAMICS INTERNATIONAL
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2021
·
IF 4.527
Shuang Yin,Dongliang Mao,Limei Pan,Xia Fang,Yang Wang,Tai Qiu,Jian Yang
The porous SiC–Si 3 N 4 composite ceramics with good EMW absorption properties were prepared by combination of gelcasting and carbothermal reduction. The pre-oxidation of Si 3 N 4 powders significantly improved the rheological properties of slurries (0.06 Pa s at 103.92 s −1 ) and also suppressed the generation of NH 3 and N 2 from Si 3 N 4 hydrolysis and reaction between Si 3 N 4 and initiator APS, thereby reducing the pore defects in green bodies and enhancing mechanical properties with a maximum value of 42.88 MPa. With the extension of oxidation time from 0 h to 10 h, the porosity and pore size of porous SiC–Si 3 N 4 composite ceramics increased from approximately 41.86% and 1.0–1.5 μm to 46.33% and ~200 μm due to the production of CO, N 2 and gaseous SiO, while the sintering shrinkage decreased from 16.24% to 10.50%. With oxidation time of 2 h, the Si 2 N 2 O fibers formed in situ by the reaction of Si 3 N 4 and amorphous SiO 2 effectively enhanced the mechanical properties , achieving the highest flexural strength of 129.37 MPa and fracture toughness of 4.25 MPa m 1/2 . Compared with monolithic Si 3 N 4 ceramics, the electrical conductivity , relative permittivity and dielectric loss were significantly improved by the in-situ introduced PyC from the pyrolysis of three-dimensional network DMAA-MBAM gel in green bodies and the SiC from the carbothermal reduction reaction between PyC and SiO 2 and Si 3 N 4 . The porous SiC–Si 3 N 4 composite ceramics prepared by the unoxidized Si 3 N 4 powders demonstrated the optimal EMW absorption properties with reflection loss of −22.35 dB at 8.37 GHz and 2 mm thickness, corresponding to the effective bandwidth of 8.20–9.29 GHz, displaying great application potential in EMW absorption fields.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Ruiguang Chen,Qin Lian,Dichen Li,Xiaoning He,Shuaiwei Wang,Jian Zhuang
Diamond/SiC composites with high thermal conductivity are important materials for electronic industry, especially electronic packaging, but their complex structures and high-precision manufacturing are still challenging issues. Stereolithography-based manufacturing method combined with the reactive melt infiltration to make diamond/SiC composites with high-precision complex structures has been proposed in this paper. Diamond particles were used as the raw material, and as the particle size is a key factor affecting composite performance its influence was studied by means of measuring parameters, examining microstructure, and detecting components, whereas related mechanisms are discussed as necessary. Subsequently, a diamond/SiC composite with the thermal conductivity of 245.68 W/(m K) has been prepared and used in experiment. The experiment shows that the precision is affected by light-scattering and bending in the printing plane and in the vertical plane respectively, with the size errors of 0.25 and 0.12 mm.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 138
·期 8
·49892
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IF 2.52
Xianbo Hou,Yan Li,Xiaoguang Luo,Rubing Zhang
Polyimide (PI) aerogels enable promising application in many fields but are always inhibited by their weak resistance to high temperature and low mechanical properties. Herein, novel PI aerogel composites with efficient heat insulation and high compressive performance are prepared by introducing Silicon carbide whiskers (SiC w ) as reinforcement. The SiC w in aerogel function as shrinkage inhibitor and high temperature stabilizer. The addition of SiC w exhibits obvious enhancement and toughening effect, the compressive strength of the PI aerogel composites increases from 1.09 to 1.96 MPa. These PI aerogel composites also show enhanced high temperature stability. The as-prepared PI aerogel composites possess integrated properties of high-temperature resistance, low thermal conductivity, and high compressive strength, which can be the candidate for the application in aerospace.
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Journal of Energy Chemistry
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2020
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IF 7.216
Da Pang,Wei Weng,Jing Zhou,Dong Gu,Wei Xiao
Direct conversion of biomass to functional materials is an ideal solution to relieve challenges in environmental and energy sustainability. We herein demonstrate a molten salt thermoelectrolysis of rice husks (RHs) mainly consisting of organic mass and biosilica to achieve high-efficiency and upgraded utilization of both Si and C in RHs. By coupling pyrolysis of organic mass with electrochemical reduction of silica in molten salts, the thermoelectrolysis of RHs in molten CaCl 2 –NaCl at 800 °C refines the RHs and acid-leached RHs to SiC nanowire/C (SiC-NW/C) and Si nanoparticle/C (Si-NP/C), respectively. The present study highlights the molten salt thermoelectrolysis for reclamation of biomass wastes in an affordable and controllable manner.
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METALS AND MATERIALS INTERNATIONAL
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2020
·Vol. 27
·期 10
·4263-4270
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IF 1.99
Chen Lili,Qi Yushi,Fei Yanhan,Du Zhiming
Abstract In order to significantly enhance the performance of graphene in metal matrix composites, in situ SiC nanorods were successfully fabricated to enhance graphene nanoplatelets (GNPs)-reinforced Al2024 composite, which was prepared by powder semi-solid processing and friction stir processing. The SiC–GNPs dispersed in the Al matrix uniformly, SiC nanorods were randomly grown on GNPs sheets in any direction, bridging GNPs as well as GNPs and the Al matrix. Meanwhile, the interfacial bonding was effective. The hybrid reinforcement of SiC and GNPs endowed composites with superior mechanical properties and thermal conductivity. The in situ SiC nanorods transfer phonons and reduce phonon scattering effect in the through-plane direction of GNPs, which conducive to heat transmission. The composite exhibits improved mechanical properties, maximum tensile strength and hardness of 589 MPa and 193 HV are obtained, with 1.0 wt% GNPs addition, respectively. The thermal conductivity of composite increases with the content of SiC–GNPs. When the content of SiC–GNPs reaches 1.5 wt%, the composite has significantly enhanced thermal conductivity (224 W m −1 K −1 ), which is 115% times higher than that of Al2024. Moreover, the effects of SiC–GNPs on the properties were discussed. Graphic Abstract
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Chuangchuang Ruan,Mengmeng Fan,Yuewen Zhang,Hongzhang Song,Xin-Jian Li,Haoshan Hao
In this work, Bi 2 Ba 2 Co 2 O y + v wt% SiC ( v = 0.00, 0.025, 0.05, 0.1, 0.2) and Bi 1.975 Na 0.025 Ba 2 Co 2 O y + w wt% SiC ( w = 0.00, 0.025, 0.05, 0.1, 0.2) ceramic samples were synthesised. The increase in the carrier concentration caused by a small amount of Na element doping leads to a decrease in the resistivity and Seebeck coefficients. The lattice distortion caused by Na element doping decrease the sample thermal conductivity . After adding SiC nanoparticles , the resistivity can be reduced further. Especially more phonons are scattered by more grain boundaries, which leads to reduced thermal conductivity. The Seebeck coefficients increase slightly due to the low energy carrier scattering effect. Considering the influence of these two factors, dispersing SiC particles on the basis of Na element doping can effectively improve the thermoelectric performance of Bi 2 Ba 2 Co 2 O y -based samples. The ZT value of the Bi 1.975 Na 0.025 Ba 2 Co 2 O y + 0.1 wt% SiC sample reaches a maximum value of 0.21 at 923 K, 26.6% higher than the Bi 1.975 Na 0.025 Ba 2 Co 2 O y sample and 93% higher than the pure Bi 2 Ba 2 Co 2 O y sample.
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MICROCHIMICA ACTA
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2019
·Vol. 186
·期 12
·1-10
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IF 5.479
Li Xingmei,Ding Yanjun,Ling Jiang,Yao Wenyan,Zha Lagabaiyla,Li Na,Chang Yunfeng,Wang Yong,Cai Jifeng
Forensic saliva identification represents an increasingly useful auxiliary means of crime investigations, particularly in sex crimes. Salivary bacteria detection techniques have been shown to be viable methods for identifying the presence of saliva. A one-pot method is described for the fabrication of bovine serum albumin-stabilized SiC nanoparticles (SiC@BSA NPs). The SiC@BSA NPs were conjugated to antibacterial peptide GH12 to allow for fluorometric detection and imaging of bacteria in saliva. More specifically, the nanoprobe, with fluorescence excitation/emission maxima at 320/410 nm, was used to detect the oral bacteria S. salivarius levels. The detection limit is 25 cfu·mL −1 , and the assay can be performed within 40 min. The nanoprobe was also used to detect bacteria in forensic body fluids including blood, urine, and semen. In all cases, positive results were obtained with (mixed) samples containing saliva, while other saliva samples without saliva showed negative results. Fluorescent images of S. salivarius cells were obtained by implementing a high-content image analysis system. These results suggest that this new nanoprobe can be applied to screen for forensic saliva stains.
Schematic representation of the preparation of SiC@BSA-GH12 nanoprobe for fluorometric detection and imaging of S. salivarius in saliva.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Bo Wei,Jintang Zhou,Zhengjun Yao,Azhar Ali Haidry,Xinlu Guo,Haiyan Lin,Kun Qian,Wenjing Chen
In the present work, high purity cubic silicon carbide (β-SiC) was synthesized by using resorcinol-formaldehyde aerogel coated silica as precursor at high temperature. Subsequently, β-SiC was coated with various concentrations of silver nanoparticles (Ag NPs) by tin sensitization electroless plating . Thereafter, the effect of various Ag NPs contents on the dielectric and microwave absorption properties of β-SiC was investigated in detailed. It is found that the Ag NPs can significantly increase the overall complex permittivity, reduce the thickness of the absorber and increase the absorption bandwidth to some extent. Despite, the improvement of the attenuation ability of electromagnetic wave with increasing contents of Ag NPs also has an adverse effect on impedance matching. The improvement in the microwave absorption of β-SiC coated with Ag NPs mainly comes from the enhancement of dipole polarization, interface polarization and conductivity loss. In the 2–18 GHz band, Ag@SiC (1.0 g/L) can achieve an effective bandwidth of 4.99 GHz at a thickness of 1.6 mm, and it is a kind of lightweight, high-temperature microwave absorbent with excellent performance.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
·
IF 6.364
Yumin An,Kun Wan,Yi Yang,Yongna Jia,Yehong Cheng
Herein, biomimetic C f /ZrB 2 -SiC ceramic composites with bouligand structures are fabricated by combining precursor impregnation, coating, helical assembly and hot-pressing sintering. First, C f /ZrB 2 -SiC ceramic films are achieved through a precursor impregnation method using polycarbosilane (PCS). Second, the PCS-C f /ZrB 2 -SiC ceramic films are coated with ZrB 2 and SiC ceramic layers. Finally, hot-pressing sintering is employed to densify helical assembly C f /ceramic films with a fixed angle of 30°. The microstructures and carbon fiber content on the mechanical properties of biomimetic C f /ZrB 2 -SiC ceramic composites are analyzed in detail. The results show that the coated ceramic layer on PCS-C f /ZrB 2 -SiC films can heal the cracks formed by pyrolysis of PCS, and the mechanical properties are obviously improved. Meanwhile, the mechanical properties could be tuned by the contents of the carbon fiber. The toughening mechanisms of C f /ZrB 2 -SiC ceramic composites with bouligand structures are mainly zigzag cracks, crack deflection, multiple cracks, carbon fiber pulling out and bridging.
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SURFACE & COATINGS TECHNOLOGY
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2022
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IF 4.865
Peng Liu,Xi Tan,Hao Ren,Wei Liu,Linwen Jiang,Xiaofeng Zhang
To improve the long-term oxidation resistance of SiC fibers, a novel yttrium-doped lanthanum monazite (Y-LaPO 4 ) coating was deposited onto the surface of SiC fibers (Y-LaPO 4 /SiC f ) by a simple hydrothermal method . The static oxidation behavior of Y-LaPO 4 /SiC f , SiC fibers coated with lanthanum monazite (LaPO 4 /SiC f ), and SiC fibers without coatings (SiC f ) was studied at 1350 °C for 50 h. The results indicated that yttrium diffused into the oxide scale during oxidation process. The thicknesses of the oxide scales for the oxidized fibers in Y-LaPO 4 /SiC f and LaPO 4 /SiC f were about 4.56 and 11.31 μm. SiC fibers without coatings were completely oxidized to silica . Furthermore, the oxidation kinetic curves of SiC f , LaPO 4 /SiC f , and Y-LaPO 4 /SiC f exhibited a parabolic trend during oxidation for 15, 20, and 50 h. Calculated the oxidation rate constants of SiC f , LaPO 4 /SiC f , and Y-LaPO 4 /SiC f were found to be 1.37, 1.08, and 0.40 μm 2 /h, respectively. The system of Y-LaPO 4 coatings not only retains LaPO 4 as a framework of the interface, but also incorporates yttrium to improve the oxidation resistance of fibers. Therefore, doping yttrium in lanthanum monazite can enhance the adherence between coatings and oxide scales and improve the oxidation resistance of SiC fibers.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 3
·2413-2418
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IF 2.195
Hu Bo,Yang Fan,Peng Ye,Hang Chunjin,Chen Hongtao,Lee Changwoo,Yang Shihua,Li Mingyu
Ag nanoparticle (NP) paste is considered to be a next-generation thermal interface material. However, its sintered microstructure is at risk of volume shrinkage and mechanical property degradation under harsh environments. In this work, silicon carbide (SiC) NPs were mixed with Ag NP paste to improve the stability and reliability of sintered Ag joints. Robust joints were prepared by a rapid thermal compression method at 275 °C for 20 s. Although the addition of SiC NPs degraded the initial shear strengths of these joints, the SiC-containing joints exhibited excellent mechanical properties and microstructural stability during thermal shock tests from − 50 to 150 °C for up to 1000 cycles. When the added amount of SiC NPs was 2%, the joints achieved the highest shear strength of 87.1 MPa (after 1000 cycles). In addition, the shear strengths of the joints were investigated at 250 °C. The addition of SiC NPs is believed to enhance the reliability of joints at high temperature.
研究领域:
材料科学
·
纳米技术
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危险品化学品经营许可证（带存储）