Materials
·
2026
·Vol. 19
·期 2
·355
·
IF 3.2
Xiumei Wu,Xiaojuan Gong,Yunping Li,Xiangming Chen,Shu Yu
Silicon oxycarbide (SiOC) ceramics are prone to failure prematurely in high-temperature applications for thermal stress-induced cracks. Doping Ti into SiOC can improve the oxidation resistance by forming a SiO2-TiO2composite oxide layer. In this study, the oxidation behavior of Ti-doped SiOC ceramics in air at 1500 °C for 32 h was examined comprehensively. SiTiOC ceramics with a titanium-to-silicon molar ratio of 0.05 demonstrated the best oxidation resistance. The oxide layer was enhanced by the distribution of TiO2and TiSiO4at the grain boundaries of SiO2, which reduced the interfacial energy and inhibited crack propagation. Furthermore, the oxide layer composed primarily of SiO2and minor TiO2exhibited low oxygen diffusion coefficients and strong self-healing capability. However, increasing the titanium-to-silicon molar ratio to 0.2 generated many pores and cracks in the oxide layer, and the outward diffusion of Ti and active oxidation of TiC were been exacerbated during oxidation.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Changhao Hu,Zhuoqi Cen,Yiling Quan,Qinghua Zhang,Xigao Jian,Kun Liang,Yujie Song,Jian Xu
Although SiOC material boasts a high upper limit of specific capacity, its performance is constrained at large specific currents due to the limitation in electron and ion transport capacities. Through the incorporation of Fe into the precursor matrix, this study successfully transformed conventional SiOC ceramics into innovative SiOC/CNTs composites. This transformation enhanced the material's conductivity and ion diffusion capability. The SiOC/CNTs composites exhibited good electrochemical performance, demonstrating substantial improvements in specific capacity and cyclic stability, especially under high specific current conditions. A high specific capacity of 495 mAh/g was obtained at a specific current of 2000 mA g −1 , and 90.14 % of the initial capacity was maintained after 1000 cycles. This resolved the longstanding issue of rapid capacity decay observed in SiOC materials at elevated specific currents. In essence, this study's innovative approach in designing and synthesizing SiOC/CNTs composites offers a promising pathway toward next-generation lithium-ion battery materials, emphasizing enhanced performance, stability, and efficiency in demanding energy storage applications.
研究领域:
材料科学
·
储能技术
·
电化学
·
纳米复合材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Fangwei Guo,Dong Su,Yang Liu,Jianming Wang,Xiao Yan,Jing Chen,Shunquan Chen
Tailoring the pore structures of ceramic membranes is the essential challenge in its application for wastewater treatment. In this paper, silicon oxycarbide (SiOC) ceramic membranes with tunable pore structures are fabricated by coating polysiloxanes (PSO) onto YSZ hollow fiber membranes followed with subsequent pyrolysis. The SiOC ceramics, with a pore size in the range of 50 nm-2 µm and porosity of 35–40%, have been obtained by varying the pore forming agents. Moreover, the SiOC layers endow the fiber membranes with high corrosion resistance regarding merely 0.07 wt% weight loss in 20 wt% H 2 SO 4 solution, since that the unique silicon oxycarbide microlattice structures can provide remarkable chemical durability. Together with considerable mechanical strength and pure water permeate flux, such SiOC ceramic membranes should find applications in industrial wastewater treatment.
研究领域:
材料科学
·
环境工程
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Rongwen Wang,Jia Lin,Shuyuan Cui,Jingjing Liu,Yihang Yang,Guimei Huang,Jinhuo Wang
SiOC ceramics were fabricated via the 1000 °C pyrolysis of cured green bodies derived from a ceramic precursor slurry system. The effects of the carbon nanotube (CNT) content on both the Si-O-C polymer precursor slurry and its resulting ceramic products were investigated. This study focused on slurry preparation, green-body properties, pyrolysis conditions, ceramic microstructure, and final performance of the resulting ceramics. The preparation method and properties of the CNTs/Si-O-C precursor materials were also examined. The experimental results demonstrated that at the optimal CNT loading of 1.5 wt%, the charge-transfer resistance of the resulting SiOC ceramic was 4.08 × 10 4 Ω cm 2 .
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Xiumei Wu,Biaobiao Yang,Yunping Li,Shu Yu
The oxidation behaviors of C/C composites with various silicon oxycarbide (SiOC) coatings prepared at various deposition temperatures (1300 - 1513 K) were studied. The SiOC coating improved the oxidation resistance of C/C composites by forming dense SiO 2 glass, but such an improvement was sensitive to the deposition temperature. The SiOC coatings prepared at low temperatures exhibited limited oxidation resistance improvement given the appearance of penetrating cracks, fundamentally caused by their thin, amorphous (high elastic modulus), dense, and brittle characteristics. The SiOC coatings prepared at high temperatures had thick, polycrystalline (low elastic modulus), loose, and resilient structures, thus exhibiting higher oxidation resistance.
研究领域:
材料科学
·
高温材料
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高影响因子
Virtual and Physical Prototyping
·
2020
·
IF 7.31
Ziyong Li,Zhangwei Chen,Jian Liu,Yuelong Fu,Changyong Liu,Pei Wang,Mingguang Jiang,Changshi Lao
Lightweight and high-strength polymer-derived SiOC ceramics with varied lattice structures have been successfully produced using different polysiloxanes as preceramic polymers (PCPs) via photopolymerisation-based digital-light-processing 3D printing and pyrolysis. Photocurable precursor resins were prepared by simple mixing of polysiloxanes with photosensitive acrylate monomers, achieving good flowability and preserving desirable stability under different heating and oscillation conditions. Complex micron-sized structures were manufactured with high precision via the optimisation of polymer formula and printing parameters. The printed PCPs pyrolysed at 600–1000°C preserved fine features with uniform shrinkage. The skeletons were almost fully dense, with smooth and flawless surfaces at macro/micro scale. Porosities and mechanical properties, including apparent compressive strength, elastic modulus, and indentation hardness, were characterised. XRD, FT-IR, Raman spectroscopy, and XPS were used to explore the chemical variations in elements and atomic bonds. High specific compressive strength to density ratios was obtained for the SiOC lattices compared with other porous ceramics.
研究领域:
材料科学
·
化学工程
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高影响因子
Energy Storage Materials
·
2019
·
IF 0
Zhiyuan Sang,Xiao Yan,Lei Wen,Dong Su,Zhihao Zhao,Yue Liu,Huiming Ji,Ji Liang,Shi Xue Dou
The rapid development of portable and wearable electronics requires novel flexible energy storage devices with high energy and power densities. Nevertheless, the fabrication of high-performance flexible electrodes for achieving this goal remains challenging. We herein report a large-area and highly-flexible polymer-derived silicon oxycarbide ceramic (SiOC) fibers cloth modified by quasi three-dimensional graphene framework (3D-GNS/SiOC f ) as a flexible anode for lithium ion batteries (LIBs). The SiOC fibers have a hierarchical porous structure and a rough surface to facilitate the insertion/extraction of Li + ions, while the GNS framework provides a conductive network by bridging the adjacent SiOC fibers and coating the individual SiOC fibers to significantly enhance electron transfer and robust electrochemical Li + ion storage. Therefore, this 3D-GNS/SiOC f material exhibits a high reversible capacity (924 mAh g -1 at 0.1 A g -1 ), good rate performance (330 mAh g -1 at 2.0 A g -1 ), and excellent cycling stability (686 mAh g -1 at 0.5 A g -1 after 500 cycles). A prototype flexible LIB full cell assembled using this anode with LiFePO 4 cathode exhibits good performance through a series of bending tests. Consequently, the resultant 3D-GNS/SiOC f anode has great potential for flexible energy storage and sheds light on the design of other flexible devices.
研究领域:
材料科学
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能源技术
·
纳米技术
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DOI
MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Xiangxin Meng,Sibo Zhang,Mingyu Wang,Huifang Xu
This work presents the optimized process to prepare porous polyvinylphenylsiloxane monoliths and an investigation on pyrolysis to lightweight silicon oxycarbide (SiOC). Gelation and phase separation during reaction were manipulated to adjust texture structure and mechanical property. Ratio of vinyl to phenyl and concentration of gelation catalyst played key role in obtaining proper texture and mechanical property to resist ambient-pressure drying shrinkage. The typical polyvinylphenylsiloxane monolith had density of 0.282 g‧cm -3 and compression strength of 3.01±0.52 MPa. It was pyrolyzed into porous SiOC with 87% ceramic yield at 1000 °C in nitrogen atmosphere. Pyrolysis shrinkage and damage were confined due to low weight loss and high strength of polysiloxane monolith. 1000 °C-derived SiOC had density of 0.386 g‧cm -3 , and room-temperature thermal conductivity of 0.108 W‧(m‧K) -1 . SEM, TEM, and XRD analyses showed morphology and amorphous structure of SiOC. Nitrogen adsorption-desorption and mercury porosimetry results revealed pore structure evolution during pyrolysis. 29 Si NMR, FTIR and TG-MS analyses investigated the molecule structure transformation of polyvinylphenylsiloxane to SiOC by elimination, exchange and recombination reactions under different pyrolysis temperatures.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xiumei Wu,Jianwei Teng,Yunping Li,Xiangming Chen,Shu Yu
Boron (B)-doped SiOC (SiBOC) ceramics were prepared by sol-gel method with triethyl borate (B(OCH 2 CH 3 ) 3 as modifier, and SiBOC ceramic bulks were prepared by spark plasma sintering (SPS). The structure evolutions of SiBOC ceramics with various B doping content and pyrolysis temperature were studied. Meanwhile, the oxidation behaviors of different SiBOC ceramic bulks at 1200 °C and 1500 °C were investigated. Results showed that B 2 O 3 and borosilicate formed during oxidation can reduce the viscosity of SiO 2 -based oxide layer and improve its self-healing ability. S0.05B-1600 ceramic showed the highest oxidation resistance, with the lowest oxidation rate of 6.82 × 10 −5 mg 2 /(cm 4 ·h) after oxidation 4 h at 1200 °C, for the dense and continuous oxide layer with high self-sealing ability and low oxygen diffusion coefficient.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Bin Du,Changqing Hong,Anzhe Wang,Shitong Zhou,Qiang Qu,Shanbao Zhou,Xinghong Zhang
Silicon oxycarbide (SiOC) ceramic aerogels in mesopores range have been fabricated by pyrolyzing polycarbosilane aerogels in nitrogen (N 2 ) atmosphere. The reactants, poly(methylhydrosiloxane) and 2, 4, 6, 8-tetramethyl-2, 4, 6, 8-tetravinylcyclotetrasiloxane have been heated in the presence of hydrochloroplatinic acid. As-prepared SiOC preceramic aerogel has specific surface area of 299 m 2 /g at room temperature, and decomposes during pyrolysis. Structural evolution of the aerogels as a function of heat-treatment temperature has been investigated by Fourier transform infrared spectrophotometer, X-ray diffraction analysis, transmission electron microscopy and X-ray photoelectron spectroscopy. Results indicate that tetrahedral Si–O–C network underwent four structural changes during thermal treatment from room temperature to 1600 °C.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 30
·期 1
·23-32
·
IF 2.523
Tian Rui,Wang Junzhang,Xu Zhou,Guo Xingzhong,Lei Wei,Ding Ronghua,Zhang Yun,Yang Hui
Silicon-based anodes are promising for high-energy density lithium-ion batteries (LIBs), while they are extremely constrained by serious volume expanding. Silicon oxycarbides (SiOC) can deliver milder volume change and acceptable theoretical capacity, but the electrochemical performance of most pure SiOC anodes is still limited by their volume expanding and poor electronic conductivity. Herein, a high-performance SiOC anode with bi-continuous macropores and robust skeletons derived from polyorganosiloxane aerogels was fabricated through a sol–gel method. The resultant SiOC material comprises free carbon phase, SiO 4 , SiO 3 C and SiO 2 C 2 units. The specific capacity of bi-continuous macroporous SiOC anode can achieve 680 mAh g −1 after 350 cycles, possessing high reversibility and stability. The synergetic effect of robust skeletons, bi-continuous macropores, appropriate constitution of free carbon phase, SiO 4 and SiO 3 C units endows the synthesized macroporous SiOC materials with such superior specific capacity and stable cycling performance. The bi-continuous macroporous SiOC with robust skeletons can provide a promising fundamental material to further achieve long-cycle SiOC anode materials.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Yun-Yang Li,Hao-Jie Yan,Lian-Kui Wu,Fa-He Cao
To improve the high temperature oxidation resistance of TiAl alloy, silicon oxycarbide (SiOC) coating was fabricated by dip-coating using polydimethylsiloxane (PDMS) as the precursor. The oxidation behavior of the coating was evaluated at 850 °C. The morphology and chemical structure of the SiOC coating were characterized by scanning electron microscopy (SEM) equipped with an energy dispersive spectroscopy (EDS), Fourier Transform infrared spectroscopy (FT-IR), X-ray photo electron spectroscopy (XPS), and X-ray diffraction (XRD). Results showed that the SiOC coating exhibited good oxidation resistance. During the thermal exposure, the selective oxidation of Al at the SiOC/TiAl alloy interface resulted in the generation of protective Al 2 O 3 , which suppressed the inward diffusion of oxygen and outward diffusion of the alloy matrix elements. However, the cracks on the surface of SiOC coating were observed, which would provide channels for the oxygen and form thermally grown oxide layer (mainly consisting of TiO 2 and Al 2 O 3 ) above the Al 2 O 3 layer.
研究领域:
材料科学
·
表面工程
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高影响因子
危险品化学品经营许可证（带存储）