CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Wenxiao Zhang,Ying Feng,Yifan Niu,Ting Liu,Xiaoyu Zhai,Jiaxiang Liu
SiC is a promising functional ceramic material with many great properties. High concentrated SiC slurry with excellent rheology and stability is required in some processes of ceramic forming. In this work, the dispersion of SiC powders was obviously improved by ternary modifiers: γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560), sodium humate and sodium dodecyl sulfate (SDS). Modified SiC slurry showed the lowest viscosity of 0.168 Pa s at a solid content of 50 vol%. The maximum absolute value of zeta potential of SiC increased from 47.3 to 61.6 mV by modification. Sedimentation experiments showed that a highly stable suspension of modified SiC was obtained at pH 10. SiC green body with high density of 2.643 g/cm 3 was prepared with modified powders by slip casting. X-ray photoelectron spectra (XPS) and thermogravimetry (TG) measurements indicated the adsorption of modifiers on SiC surface. Therefore, modified SiC powders could stably disperse in aqueous media due to the increase of electrosteric repulsion between particles. The novel strategy used in this study could further improve the dispersion of SiC powders.
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高影响因子
Additive Manufacturing
·
2023
·
IF 11
Haiyu Liu,Deqing Mei,Senyu Qian,Yancheng Wang
Ceramic-based porous structures have received considerable attention due to their excellent thermal properties. However, the disordered pore arrangement inside traditional porous ceramics would significantly weaken their structural performance. This paper presents the vat photopolymerization of polymer-derived ceramics (PDCs) to fabricate porous SiC ceramic components with triply period minimal surface (TPMS), which have a regular pore arrangement and can be used as catalyst supports for hydrogen production . The photosensitive preceramic polymer resin with low viscosity was prepared by directly dissolving polycarbosilane (PCS) into photosensitive resin and organic solvent . Five different types of TPMS structures, including the P, G, D, I-WP, and F-RD surfaces, were designed and printed using the optimized preceramic polymer resin. After the ceramization process, the TPMS structural SiC ceramic components with a high porosity of 80% were successfully obtained, exhibiting precise microstructures and excellent mechanical properties. Furthermore, the fabricated TPMS structural SiC components were used as catalyst supports in a methanol steam reforming (MSR) microreactor , and the experimental results show that the TPMS structural catalyst support is a great choice for hydrogen production. Notably, catalyst supports with P, G, and D surfaces showed excellent flow performance with different flow paths. The D surface, in particular, exhibited the best reaction performance with the hydrogen production and conversion rate of 82.62 ml/min and 78.7%.
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高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yang Yang,Ruiying Wang,Shanliang Chen,Lan Jiang,Qiao Liu,Lin Wang,Weiyou Yang,Feng Hu,Weijun Li
In the present work, we report the exploration of rationally designed electrodes based on quasi-aligned nanoarrays composited by the cores of SiC nanowires and shells of sulfur-doped porous carbons (SiC@PC-S), which are directly employed as the free-standing electrodes for Zn-ion hybrid supercapacitors . They behave an ultrahigh areal capacitance of 38.24 mF/cm 2 at a scan rate of 10 mV/s, with an exceptional rate capability (~20.67 mF/cm 2 even at 1000 mV/s). The as-constructed hybrid supercapacitors deliver a remarkable energy of 10.6 μWh/cm 2 , which is the highest one among SiC-based supercapacitors ever reported. Moreover, such hybrid devices exhibit a high power density of 7.2 mW/cm 2 and a robust cycle stability with ~97 % capacitance retention after 5000 cycles at 2 mA/cm 2 , representing their promising practical applications.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Jie Tang,Huihui Zhang,Haotian Chang,Xiaotian Guo,Chaoyang Wang,Yuquan Wei,Zhengren Huang,Yong Yang
Silicon carbide is one of the most important high-performance engineering ceramics. However, SiC ceramics with complex structure and high mechanical performance are difficult to shape, sinter, and process. Additive manufacturing is expected to solve the above problems, but the photosensitive slurry with low solid content leads to high residual Si content and low strength of final components. Here, we presented one novel strategy to prepare high-strength SiC components with complex structure by introducing quasi-spherical diamond powder as the high-density carbon source through vat photopolymerization 3D printing technology and reactive melt infiltration process. The final RB–SiC ceramics exhibited a specific flexural strength of 312.45 ± 18.75 MPa and elastic modulus of 359.16 ± 4.57 GPa, demonstrating one of the highest flexural strength and elastic modules among those reported for 3D-printed SiC composites. Owing to the high mechanical performance and simple fabrication process, this strategy has significant advantages in the manufacturing of structural SiC ceramics.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Linlin Zhou,Tao Yang,Chunyu Guo,Kang Wang,Enhui Wang,Laipan Zhu,Hailong Wang,Sheng Cao,Kuo-Chih Chou,Xinmei Hou
Piezoelectric silicon carbide (SiC) has been quite attractive due to its superior chemical and physical properties as well as wide potential applications. However, the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified applications. Here, flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators (PENGs) and stress/temperature/light sensors. The open circuit voltage ( V oc ) and the density of short circuit current ( I sc ) of the PENG based on the PVDF/5 wt% 6H-SiC composite fiber films reach 28.94 V and 0.24 µA cm –2 , showing a significant improvement of 240% and 300% compared with that based on the pure PVDF films. The effect of 6H-SiC nanoparticles (NPs) on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element analysis. The stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding stimuli. This study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yuxuan Wang,Jingjing Wei,Yongda Wang,Pei Nian,Wentao Wang,Dong Wei,Nan Xu,Taotao Zhu,Zhixin Wu,Yibin Wei
Engineering of superhydrophobic-superoleophilic (SHB-SOL) ceramic membrane surface with hierarchical structures remains challenging and the relation between physicochemical structure-dependent wettability and separation performance lacks investigation. Herein, SHB-SOL SiC ceramic membranes with different hierarchical micro-nano structures were fabricated by ZnO nanoflower (NF) deposition and silane grafting. Three SiC ceramic membranes with different pore sizes were purposefully used as the pristine, these membranes displayed similar geometric structures in different scales. The modified SiC membrane surface becomes stronger in SHB-SOL property as the pore size decreases and the optimal membrane possessing the lowest pore size presented a water contact angle of 172.46° and a water sliding angle of 5°. When used for pure oil or oily mixture separation, all the SHB-SOL SiC membranes exhibited enhanced oil fluxes compared with their pristine forms. At a pressure of 0.5 bar, the optimal membrane could completely reject water droplets and graphite solids (D 50 =4.8 µm) for the oil-water-solid mixture containing 0.05 wt% water and 0.05 wt% graphite, showing a stable oil (hexane) flux of 1383.8 L·m −2 ·h −1 . This work also reveals the effects of the hierarchical structures on the SHB-SOL property formation and the resulting antifouling mechanism, which offers novel insights into boosting ceramic membranes with desired surface wettability for enhanced separation performance.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Jun-Min Zhang,Xiao-Wu Chen,Jin-Shan Yang,Xiang-Yu Zhang,Yan-Mei Kan,Jian-Bao Hu,Yu-Dong Xue,Hao Qin,Shao-Ming Dong
The poor wet-oxidation resistance limits the long-life service of SiC f /SiC composites as the hot end components of aero-engines. The stability of SiC f /SiC composites under high-temperature wet oxygen environment can be promoted by more robust SiC matrix. In this work, the effect of Y 2 O 3 on the corrosion behaviors of SiC ceramics in flowing O 2 /H 2 O atmosphere at 1400 ℃ was studied. Duo to the continuous Y 2 Si 2 O 7 layer formed on the surface, SiC-Y 2 O 3 ceramics exhibit much better wet-oxidation resistance than original SiC ceramics. During the oxidation process , Y 2 O 3 dispersed in the ceramics migrates to the surface and reacts with SiO 2 to form β-Y 2 Si 2 O 7 . Subsequently, the β-Y 2 Si 2 O 7 aggregates and grows to form a continuous Y 2 Si 2 O 7 layer, inhibiting the corrosion from oxidizing medium to the inner SiC matrix. This study is expected to provide important ideas for the design and structure regulation of wet-oxidation resistant SiC f /SiC composites.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 29
·期 11
·1806250
·
IF 13.325
Tao Yang,Shanliang Chen,Xiaoxiao Li,Xiaojie Xu,Fengmei Gao,Lin Wang,Junhong Chen,Weiyou Yang,Xinmei Hou,Xiaosheng Fang
In the present work, high-performance photodetectors (PDs) based on a single B-doped 3 C -SiC nanobelt, which are synthesized via catalyst-free pyrolysis of polymeric precursors of polysilazane, are reported. The as-built PDs have a high responsivity and external quantum efficiency of 6.37 × 10 5 A · W −1 and 2.0 × 10 8 % under 405 nm light with a power density of 0.14 mW · cm −2 at 5 V, respectively. The detectivity of the PDs is measured to be of 6.86 × 10 14 Jones. Moreover, the B-doped 3 C -SiC nanobelt PDs exhibit a long-term stability against 300 °C up to 180 days, suggesting their promising applications to be served under harsh conditions.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Changlian Chen,Xin Liang,Maya Luo,Shicong Zhou,Jiayou Ji,Zhiliang Huang,Man Xu
Porous Si 3 N 4 -bonded SiC ceramics with high porosity were prepared by the reaction-sintering method. In this process, Si 3 N 4 was synthesized by the nitridation of silicon powder. The X-ray diffraction (XRD) indicated that the main phases of the porous Si 3 N 4 -bonded SiC ceramics were SiC, α-Si 3 N 4 , and β-Si 3 N 4 , respectively. The contents of β-Si 3 N 4 were increased following the sintering temperature . The morphology of Si 3 N 4 whiskers was investigated by scanning electron microscope (SEM), which was shown that the needle-like (low sintering-temperature) and rod-like (higher sintering-temperature) whiskers were formed, respectively. From low to high synthesized temperature, the highest porosity of the porous Si 3 N 4 bonded SiC ceramic was up to 46.7%, and the bending strength was ~11.6 MPa. The α-Si 3 N 4 whiskers were derived from the reaction between N 2 and Si powders, the growth mechanism was proved by Vapor–Solid (VS). Meanwhile, the growth mechanism of β-Si 3 N 4 was in accordance with Vapor–Solid–Liquid (VSL) growth mechanism. With the increase of sintering temperature, Si powders were melted to liquid silicon and the α-Si 3 N 4 was dissolved into the liquid then the β-Si 3 N 4 was precipitated successfully.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 2
·1487-1495
·
IF 2.324
Liu Yangwen,Gao Fengmei,Wang Lin,Yang Weiyou,He Xinbo,Hou Huilin
In the present work, we reported the fabrication of CdS decorated mesoporous SiC hollow nanofibers for efficient visible-light-driven photocatalytic hydrogen production. The mesoporous SiC hollow nanofibers were firstly fabricated by electrospinning, followed by hydrothermal treatment to introduce the CdS nanoparticles decorated on the preformed fiber matrix, The resultant CdS/SiC hybrid photocatalysts were systematically characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM) and N 2 adsorption. The as-fabricated CdS/SiC hybrids exhibited a robust stability with a release rate up to ~ 124.65 µmol h −1 g −1 for photocatalytic H 2 evolution driven by visible light, which was profoundly enhanced for more than 16 times to that of pristine SiC counterparts, and comparable to the state-of-the-art one of SiC-based photocatalysts.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Faliang Li,Cao Tan,Jianghao Liu,Junkai Wang,Quanli Jia,Haijun Zhang,Shaowei Zhang
Herein, we prepare phase-pure ZrB 2 -SiC composite powders by molten-salt-mediated reduction of ZrSiO 4 /B 2 O 3 /activated carbon mixtures with Mg, showing that the phase composition and morphology of the above composites is influenced by firing temperature, B:Zr and C:Si molar ratios, and the amount of excess Mg. Notably, phase-pure ZrB 2 -SiC powder with a ZrB 2 :SiC weight ratio of ~75:25 could be obtained by 3-h firing at 1200 °C, i.e., at a temperature lower than that used for conventional carbothermal reduction by at least 200 °C. As-prepared ZrB 2 -SiC composites exhibited grain sizes of several microns and comprised SiC nanoparticles well distributed in the ZrB 2 matrix. Finally, the oxidation activation energies of the prepared ZrB 2 and ZrB 2 -SiC powders were determined as 326 and 381 kJ/mol, respectively, which demonstrated that the introduction of SiC improved the oxidation resistance of monolithic ZrB 2 .
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Qianglong He,Aiyang Wang,Chun Liu,Weimin Wang,Hao Wang,Zhengyi Fu
B 4 C-TiB 2 -SiC composites were fabricated via hot pressing using ball milled B 4 C, TiB 2 , and SiC powder mixtures as the starting materials. The impact of ball milling on the densification behaviors, mechanical properties , and microstructures of the ceramic composites were investigated. The results showed that the refinement of the powder mixtures and the removal of the oxide impurities played an important role in the improvement of densification and properties. Moreover, the formation of the liquid phases during the sintering was deemed beneficial for densification. The typical values of relative density, hardness, bending strength , and fracture toughness of the composites reached 99.20%, 32.84 GPa, 858 MPa and 8.21 MPa m 1/2 , respectively. Crack deflection, crack bridging, crack branching, and microcracking were considered to be the potential toughening mechanisms in the composites. Furthermore, numerous nano-sized intergranular/intragranular phases and twin structures were observed in the B 4 C-TiB 2 -SiC composite.
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高影响因子
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