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Effects of Zr2Cu Packing Modification on Microstructure and Mechanical and Ablation Properties of PIP-Prepared C/C-SiC-ZrC Composites 认领 引用
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作者 Xie Jing Zhang Qian +6 位作者 Ren Jing Su Hailong Tian Lulu Zhi Xionghui Sun Guodong Li Hui Wang Long 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第8期1940-1946,共7页
To improve the compactness and properties of C/C-SiC-ZrC composites produced by precursor infiltration and pyrolysis(PIP)method,the low-temperature reactive melt infiltration(RMI)process was used to seal the composite... To improve the compactness and properties of C/C-SiC-ZrC composites produced by precursor infiltration and pyrolysis(PIP)method,the low-temperature reactive melt infiltration(RMI)process was used to seal the composites using Zr2Cu as the filler.The microstructure,mechanical properties,and ablation properties of the Zr2Cu packed composites were analyzed.Results show that during Zr2Cu impregnation,the melt efficiently fills the large pores of the composites and is converted to ZrCu due to a partial reaction of zirconium with carbon.This results in an increase in composite density from 1.91 g/cm3to 2.24 g/cm3and a reduction in open porosity by 27.35%.Additionally,the flexural strength of Zr2Cu packed C/C-SiC-ZrC composites is improved from 122.78±8.09 MPa to 135.53±5.40 MPa.After plasma ablation for 20 s,the modified composites demonstrate superior ablative resistance compared to PIP C/C-SiC-ZrC,with mass ablation and linear ablation rates of 2.77×10−3g/s and 2.60×10−3mm/s,respectively.The“selftranspiration”effect of the low-melting point copper-containing phase absorbs the heat of the plasma flame,further reducing the ablation temperature and promoting the formation of refined ZrO2particles within the SiO2melting layer.This provides more stable erosion protection for Zr2Cu packed C/C-SiC-ZrC composites. 展开更多
关键词 C/C-SiC-ZrC composites Zr2Cu packing microstructure mechanical property ablation property
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皱纹状介孔C-mSiO2/CeO2复合磨料对氧化硅的化学机械抛光机制 认领 引用
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作者 王东伟 王胜利 +4 位作者 杨云点 罗翀 栾晓东 邵祥清 李瑾 《润滑与密封》 CAS CSCD 北大核心 2026年第3期106-113,共8页
为探究二氧化硅层间介质(ILD)化学机械抛光(CMP)过程中抛光速率与表面缺陷的控制机制,研究皱纹状介孔碳修饰二氧化硅/氧化铈(C-mSiO2/CeO2)复合磨料对氧化硅的抛光行为。通过微乳液法制备具有核壳结构的复合磨料,经扫描电子显微镜... 为探究二氧化硅层间介质(ILD)化学机械抛光(CMP)过程中抛光速率与表面缺陷的控制机制,研究皱纹状介孔碳修饰二氧化硅/氧化铈(C-mSiO2/CeO2)复合磨料对氧化硅的抛光行为。通过微乳液法制备具有核壳结构的复合磨料,经扫描电子显微镜(SEM)和透射电子显微镜(TEM)表征,证实其具备完整的包覆形貌。抛光实验结果表明:相较于普通氧化硅及氧化铈磨料,C-mSiO2/CeO2复合磨料对氧化硅的去除速率最高可达112.1 nm/min,同时获得优异表面质量(表面粗糙度Sq=0.0514 nm)。能量色散X射线光谱(EDX)元素分析显示,Si、O、Ce元素质量分数分别为18.65%、38.78%和42.57%。氮气吸附-脱附测试结合Brunauer-Emmett-Teller和Barrett-Joyner-Halenda模型计算表明,该磨料具有221.716 m2/g的高比表面积、5.44 nm孔径及0.3187 cm3/g孔体积,其有序孔隙结构和高比表面积为CMP过程提供了优异的机械支撑。X射线光电子能谱(XPS)化学键分析表明,CeO2颗粒主要通过Si-O-Ce键与SiO2内核结合。这种化学键合作用及体系中Ce3+离子含量的提升,协同促进了氧化硅去除速率的显著提高。 展开更多
关键词 C-mSiO2/CeO2复合磨料 化学机械拋光 二氧化硅 高比表面积 核壳结构
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Effect of boron doping on waterproof and dielectric properties of polyborosiloxane coating on SiO2f/SiO2 composites 认领 引用 被引量：8
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作者 Long XIA Siru LU +7 位作者 Bo ZHONG Longnan HUANG Hua YANG Tao ZHANG Haibo HAN Pan WANG Li XIONG Guangwu WEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2019年第8期2017-2027,共11页
A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among b... A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among boron doping, chemical structure of precursors and durability of hydrophobic coatings was discussed. The Si-O-B and methyl groups were successfully introduced in the gel precursors according to the FT-IR and XPS results. The resins were filled in the internal and surface holes of the SiO2f/SiO2 composites partially or completely, which is beneficial to reduce the physical adsorption of the moisture. In addition, hydroxyl groups of the SiO2f/SiO2 composites reacted with the resins and hydrophobic methyl groups were introduced, leading to the reduction of the chemical adsorption of water. Also, the boron doping was beneficial to enhancing the physical cross-linking between the coating and the SiO2f/SiO2 composites, and improved the adhesion of the coating to the substrate. The results show that the optimal hydrophobic coating with contact angle 130.33°, moisture absorption 0.33% and adhesion level 1 is obtained when the molar ratio of MTES to B(OH)3 is 10:4. The real permittivity of M10B4 is constant in the range of 2.32–2.51 and the dielectric tangent loss is constant in the range of 5.5 × 10-4–8.7 × 10-3. The hydrophobic coating has excellent dielectric properties. 展开更多
关键词 Adhesion Dielectric Hydrophobic Polyborosiloxane SiO2f/SiO2 composites
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Oxidation behavior of C/C composites with SiC/ZrSiO_4-SiO_2 coating 认领 引用 被引量：6
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作者 李杨 肖鹏 +2 位作者 李专 罗威 周伟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第2期397-405,共9页
A SiC/ZrSiO4？SiO2 （SZS） coating was successfully fabricated on the carbon/carbon （C/C） composites by pack cementation, slurry painting and sintering to improve the anti-oxidation property and thermal shock resist... A SiC/ZrSiO4？SiO2 （SZS） coating was successfully fabricated on the carbon/carbon （C/C） composites by pack cementation, slurry painting and sintering to improve the anti-oxidation property and thermal shock resistance. The anti-oxidation properties under different oxygen partial pressures （OPP） and thermal shock resistance of the SZS coating were investigated. The results show that the SZS coated sample under low OPP, corresponding to the ambient air, during isothermal oxidation was 0.54% in mass gain after 111 h oxidation at 1500 ° C and less than 0.03% in mass loss after 50 h oxidation in high OPP, corresponding to the air flow rate of 36 L/h. Additionally, the residual compressive strengths （RCS） of the SZS coated samples after oxidation for 50 h in high OPP and 80 h in low OPP remain about 70% and 72.5% of those of original C/C samples, respectively. Moreover, the mass loss of SZS coated samples subjected to the thermal cycle from 1500 ° C in high OPP to boiling water for 30 times was merely 1.61%. 展开更多
关键词 C/C composite SiC/ZrSiO4-SiO2 coating oxygen partial pressure anti-oxidation thermal shock residual compressive strength
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The influence of ablation products on the ablation resistance of C/C-SiC composites and the growth mechanism of SiO_2 nanowires 认领 引用 被引量：2
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作者 李县辉 燕青芝 +3 位作者 米应映 韩永军 温馨 葛昌纯 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第2期7-11,共5页
Ablation under oxyacetylene torch with heat flux of 4186.8（10%kW/m2 for 20 s was performed to evaluate the ablation resistance of C/C-SiC composites fabricated by chemical vapor infiltration（CVI） combined with liqu... Ablation under oxyacetylene torch with heat flux of 4186.8（10%kW/m2 for 20 s was performed to evaluate the ablation resistance of C/C-SiC composites fabricated by chemical vapor infiltration（CVI） combined with liquid silicon infiltration（LSI） process.The results indicated that C/C-SiC composites present a better ablation resistance than C/C composites without doped SiC.The doped SiC and the ablation products SiO2 derived from it play key roles in ablation process.Bulk quantities of SiO2 nanowires with diameter of 80 nm-150 nm and length of tens microns were observed on the surface of specimens after ablation.The growth mechanism of the SiO_2 nanowires was interpreted with a developed vapor-liquid-solid（VLS） driven by the temperature gradient. 展开更多
关键词 C/C-SiC composites ablation products SiO2 nanowires growth mechanism
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Fabrication and characterization of SiO2(f)/Si)_3N_4 composites 认领 引用 被引量：4
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作者 Yongsheng Liu Laifei Cheng +2 位作者 Litong Zhang Yongdong Xu Yi Liu 《Journal of University of Science and Technology Beijing》 2007年第5期454-459,共6页
A silicon dioxide fiber-reinforced silicon nitride matrix(SiOJSi3N4)composite used for radomes was prepared by chemical vapor infiltration(CVI)process using the SiCl4-NH3-H2 system.The effects of the process condition... A silicon dioxide fiber-reinforced silicon nitride matrix(SiOJSi3N4)composite used for radomes was prepared by chemical vapor infiltration(CVI)process using the SiCl4-NH3-H2 system.The effects of the process conditions,including infiltration temperature,infiltration time,and gas flux were investigated.The energy dispersion spectra(EDS)result showed that the main elements of this composite contained Si,N,and O.The X-ray diffraction(XRD)results indicated that phases of the composite before and after treatment at 1350℃were all amorphous.A little fiber pull-out was observed on the cross section of the composite by scan electron microscope(SEM).As a result,the composite exhibited good thermal stability,but an appropriate interface was necessary between the fiber and the matrix. 展开更多
关键词 SiO2/Si3N4 composite fabrication characterization chemical vapor infiltration
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Fracture Mechanism of 3D, Five-directional Braided (SiO_2)_f /SiO_2 Composites Prepared by Silicasol-infiltration-sintering Method 认领 引用 被引量：1
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作者 李斌斌 ZHU Jianxun +2 位作者 LIN Long LIU Yong CHEN Zhaofeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第2期355-357,共3页
Three-dimensional （3D） five-directional braided （SiO2）/SiO2 composites were prepared by silicasol-infiltration-sintering （SIS） method. The flexural properties and microstructures were studied. The flexural stren... Three-dimensional （3D） five-directional braided （SiO2）/SiO2 composites were prepared by silicasol-infiltration-sintering （SIS） method. The flexural properties and microstructures were studied. The flexural strength and flexural elastic modulus were found to be 73 MPa and 12 GPa, respectively. The results of stress vs deflection curve and SEM examinations revealed that the fracture mechanism of 3D, five-directional braided （SiO2）/SiO2 composite was a mixture mode of ductile and brittle. The ductile mode was attributed to the weak bonding strength of fiber/matrix at low temperature. The brittle fracture might be caused by the propagation of micro defect or crack, which existed in the as-prepared composites for the ten-cycle process. 展开更多
关键词 fracture mechanism 3D five-directional （SiO2）y/SiO2 composite silicasol-infiltrationsintering method
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DEFORMATION INVESTIGATION ON iPP/SiO_2 COMPOSITES: INFLUENCE OF STRETCHING TEMPERATURE AND PARTICLE SIZE ON MORPHOLOGY EVOLUTION AND CRYSTALLINE STRUCTURE OF THIN FILMS 认领 引用
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作者 Xiu-qin Zhang Qian Xing +2 位作者 Rong-bo Li 王锐 Du-jin Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2013年第2期275-284,共10页
In the present work, structure changes during （SiO2） composites have been investigated systematically stretching of isotactic polypropylene （iPP） and iPP/silicon dioxide The or-form crystal structure of both iPP a... In the present work, structure changes during （SiO2） composites have been investigated systematically stretching of isotactic polypropylene （iPP） and iPP/silicon dioxide The or-form crystal structure of both iPP and iPP/SiO2 composites is destroyed and transforms into the mesophase as the samples are stretched at a low temperature （35℃）, while stretching at high temperatures （90℃ and 120℃） can restrain the appearance of defects and keep the perfection of crystal structure. FTIR results reveal that the stretching temperatures show no obvious difference of the effect on the orientation of pure iPP, however, the orientation of iPP/SiO2 composites is greatly changed by the tensile temperature. In the case of micron-sized SiO2 particles （average particle diameter d 〉 1 μm）, the orientation of the composites is lower than that of pure iPP at all stretching temperatures. The above results suggest that the stretching temperature and the SiO2 particle size have great influence on the structure variation and orientation behavior of iPP/SiO2 composites. 展开更多
关键词 iPP/SiO2 composites Stretching Morphology Structure variation.
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Photocatalytic and Thermal Insulating Performances of Fiber Reinforced Hierarchical TiO_2/SiO_2 Xerogel Composites Synthesized by Ambient Drying Route 认领 引用
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作者 徐海珣 赵善宇 +2 位作者 郑猛 贾佳佳 朱平华 《Journal of Donghua University(English Edition)》 CAS 2017年第4期570-576,共7页
Silica( SiO_2) based aerogel/xerogel materials have been received ever-growing attentions for versatile applications. However,the widespread applications are narrowed by the inert properties,fragile and brittle nature... Silica( SiO_2) based aerogel/xerogel materials have been received ever-growing attentions for versatile applications. However,the widespread applications are narrowed by the inert properties,fragile and brittle natureof silica materials and cumbersome preparation processes. In this paper,titania( TiO_2) was introduced into SiO_2 matrix to form photocatalytic hybrid gels. The TiO_2/SiO_2 composites were then reinforced by the impregnation of various fibrillary reinforcements,such as glass,mullite mineral and ceramic fibers. The properties of the composites were studied systematically in terms of fiberstability,microstructure,chemical interaction and thermal conductivity. The final xerogel composites displayed improved monolithic geometry,satisfied thermal conductivity(0. 09-0. 25 W·m-1·K-1) and optimized photocatalytic performance(85% removal of model pollutant of methyl orange( Mo)),which could be expected to be a feasible route to multi-functional building facades in the future. 展开更多
关键词 titania-silica（TiO2/SiO2） composite photocatalytic thermal conductivity fiber reinforcement
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Preparation of hollow B–SiO2@TiO2 composites and their photocatalytic performances for degradation of ammonia-nitrogen and green algae in aqueous solution 认领 引用 被引量：7
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作者 Qin Zhou Hengbo Yin +1 位作者 Aili Wang Yang Si 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第10期2535-2543,共9页
Hollow B–SiO2@TiO2 composites were prepared by the wet chemical deposition method starting from TiCl4 and hollow B–SiO2 microspheres.TiO2 layers composed of anatase TiO2 nanoparticles were coated on the surfaces of ... Hollow B–SiO2@TiO2 composites were prepared by the wet chemical deposition method starting from TiCl4 and hollow B–SiO2 microspheres.TiO2 layers composed of anatase TiO2 nanoparticles were coated on the surfaces of the hollow B–SiO2 microspheres probably through the formation of Ti—O—Si and Ti—O—B bonds.A great number of—OH groups were also present at the TiO2 coating layers.The presence of Ti—O—Si bonds and Ti—O—B bonds resulted in the formation of defects in the TiO2 coating layers,which decreased the band gap of the TiO2 coating layers to ca.3.0 eV and endowed the TiO2 coating layers with visible light absorption performance.The buoyancy hollow B–SiO2@TiO2 composites exhibited high photocatalytic activities for the degradation of ammonia-nitrogen and green algae.The conversion of ammonia-nitrogen reached 65%when the degradation of ammonia-nitrogen(43 mg·L-1 at pH value of 8)was catalyzed by the B–SiO2@TiO2(100:10)composite under the simulated solar light irradiation at 35°C for 660 min.The green algae(5 mg·L-1)were almost completely degraded over the B–SiO@TiO2(100:20)photocatalyst under the visible light irradiation at 35°C for 510 min. 展开更多
关键词 B–SiO2@TiO 2composites Photocatalysis Ammonia-nitrogen Green algae
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SiO_x-based(0 认领 引用 被引量：4
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作者 Tong Wang Xiaotian Guo +2 位作者 Huiyu Duan Changyun Chen Huan Pang 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第3期654-666,共13页
Silicon(Si) materials as anode materials for applications in lithium-ion batteries(LIBs) have received increasing attention.Among the Si materials,the electrochemical properties of SiOx-based(0<x≤2)composites are ... Silicon(Si) materials as anode materials for applications in lithium-ion batteries(LIBs) have received increasing attention.Among the Si materials,the electrochemical properties of SiOx-based(0<x≤2)composites are the most prominent.However,due to the cycling stability of SiOx being far from practical,there are some problems,such as Iow initial coulombic efficiency(ICE),obvious volume expansion and poor conductivity.Researchers in various countries have optimized the electrochemical properties of SiOx-based composites by means of pore formation,surface modification,and the choice of constituents.In this review,SiOx-based composites are classified into three categories based on the valency of Si(SiO2 composites,SiO composites and SiOx(0<x<2) composites).The synthesis,morphologies and electrochemical properties of the SiOx-based composites that are applied in LIB are discussed.Finally,the prope rties of several common SiOx-based composites are briefly compared and the challenges faced by SiOx-based composites are highlight. 展开更多
关键词 Lithium-ion battery Anode material SiO2 composites SiO composites SiOx-based(0composite
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Enhanced wetting and properties of carbon/carbon-Cu composites with Cr_3C_2 coatings by Cr-solution immersion method 认领 引用 被引量：6
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作者 Bo Kong Jinming Ru +1 位作者 Hongdi Zhang Tongxiang Fan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第3期458-465,共8页
A facile ammonium-dichromate solution immersion method was introduced to synthesize the copperwettable Cr3C2 coating on and inside the carbon-carbon （C/C） preform. The formation mechanism and the microstructures of ... A facile ammonium-dichromate solution immersion method was introduced to synthesize the copperwettable Cr3C2 coating on and inside the carbon-carbon （C/C） preform. The formation mechanism and the microstructures of the Cr3C2 coatings were studied. The contact angle between molten copper and the C/C decreased from 140°to 60°, demonstrating the significant improvement in the wettability. The Cr3C2- coated C/C-Cu composite with only 4.2% porosity and 3.69 gcm^-3 density was manufactured through copper infiltration. As a result, the thermal and electrical conductivity of the modified C/C-Cu increased significantly due to the infiltrated copper. Also the mechanical properties of the composites including both the flexural and compressive strengths were enhanced by over 100%. The modified C/C-Cu composite exhibited lower friction coefficients and wear rates for different load levels than those of the commercial C/Cu composite. These results demonstrate the potential of the modified C/C-Cu material for use in electrical contacts. 展开更多
关键词 Enhanced wetting and properties of carbon/carbon-cu composites with Cr3C2 coatings by Cr-solution immersion method Cr Cu
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聚多巴胺/石墨烯复合物电化学传感器同时检测VC和VB2 认领 引用
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作者 尚永辉 薛景文 任海梅 《化学工程师》 CAS 2026年第7期23-28,共6页
实验制备了聚多巴胺/石墨烯复合物修饰玻碳电极(PDA-GO/GCE),实验发现VC、VB2在修饰电极上的电化学响应信号分别是裸电极的2倍和6倍,表明修饰电极对VC、VB2具有良好的催化效果。此外,在修饰电极上VC和VB2的差分脉冲峰电位相差6... 实验制备了聚多巴胺/石墨烯复合物修饰玻碳电极(PDA-GO/GCE),实验发现VC、VB2在修饰电极上的电化学响应信号分别是裸电极的2倍和6倍,表明修饰电极对VC、VB2具有良好的催化效果。此外,在修饰电极上VC和VB2的差分脉冲峰电位相差600mV以上,可实现VC和VB2的同时测定,基于此,建立了聚多巴胺/石墨烯复合物电化学传感器同时检测VC和VB2的新方法。结果表明,在pH值为1.81的伯瑞坦-罗比森(BR)缓冲溶液中,VC在0.002~30.00μmol·L-1浓度范围内与峰电流Ip呈良好线性关系,Ip(μA)=0.534C(μmol·L-1)+2.56(R=0.9986),检出限(S/N=3)为0.0006μmol·L-1;VB2在0.005~100.0μmol·L-1浓度范围内与峰电流Ip呈良好线性关系,Ip(μA)=0.179C(μmol·L-1)+2.45(R=0.9961),检出限(S/N=3)为0.0015μmol·L-1,方法检出限低,线性范围宽,线性良好,VC、VB2二者之间不存在干扰。 展开更多
关键词 聚多巴胺/石墨烯复合物修饰玻碳电极 维生素C 维生素B2 同时测定
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Nanoindentation Study on Mechanical Properties of Nano-SiO2/Dental Resin Composites 认领 引用 被引量：1
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作者 Chao Zha Jianhua Hu +7 位作者 Ainong Li Shangyu Huang Hanxing Liu Gang Chen Anqi Lei Zuoqi Zhang Bei Li Zhengzhi Wang 《Journal of Materials Science and Chemical Engineering》 2018年第4期57-64,共8页
The microano-scale indentation tests were performed to explore the performance of bisphenol-α-glycidyl methacrylate (Bis-GMA)riethylene glycol dimethacrylate (TEGDMA) dental resin composites. The effect of the fillin... The microano-scale indentation tests were performed to explore the performance of bisphenol-α-glycidyl methacrylate (Bis-GMA)riethylene glycol dimethacrylate (TEGDMA) dental resin composites. The effect of the filling content of nano-SiO2 particles on the mechanical properties of the dental composites was studied as well. The experimental results showed that the incorporation of the nano-SiO2 particles at low concentrations (up to 10 wt.%) can apparently increase the hardness and elastic modulus of the dental rein composites. The plasticity index indicates a best elastic recovery capability at a proper amount (4 wt.%) of the nanoparticles. Combined with the infrared spectrum, the mechanical enhancement mechanisms of the dental resin composites were analyzed. 展开更多
关键词 Indentation SiO2 Nanoparticles Dental Resin Composites Mechanical Properties
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Evolution of the volume expansion of SiO/C composite electrodes in lithium-ion batteries during aging cycles 认领 引用
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作者 Haosong Yang Kai Sun +2 位作者 Xueyan Li Peng Tan Lili Gong 《中国科学技术大学学报》 CAS CSCD 北大核心 2025年第2期27-33,26,I0001,共7页
As a negative electrode material for lithium-ion batteries,silicon monoxide(SiO)suffers from dramatic volume changes during cycling,causing excessive stress within the electrode and resulting in electrode deformation ... As a negative electrode material for lithium-ion batteries,silicon monoxide(SiO)suffers from dramatic volume changes during cycling,causing excessive stress within the electrode and resulting in electrode deformation and fragmentation.This ultimately leads to a decrease in cell capacity.The trends of volume expansion and capacity change of the SiO/graphite(SiO/C)composite electrode during cycling were investigated via in situ expansion monitoring.First,a series of expansion test schemes were designed,and the linear relationship between negative electrode expansion and cell capacity degradation was quantitatively analyzed.Then,the effects of different initial pressures on the long-term cycling performance of the cell were evaluated.Finally,the mechanism of their effects was analyzed by scanning electron microscope.The results show that after 50 cycles,the cell capacity decreases from 2.556 mAh to 1.689 mAh,with a capacity retention ratio(CRR)of only 66.08%.A linear relationship between the capacity retention ratio and thickness expansion was found.Electrochemical measurements and scanning electron microscope images demonstrate that intense stress inhibits the lithiation of the negative electrode and that the electrode is more susceptible to irreversible damage during cycling.Overall,these results reveal the relationship between the cycling performance of SiO and the internal pressure of the electrode from a macroscopic point of view,which provides some reference for the application of SiO/C composite electrodes in lithium-ion batteries. 展开更多
关键词 lithium-ion batteries in situ expansion measurement initial stress cycle life SiO/C composite electrode
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Anti-oxidation properties of ZrB_2 modified silicon-based multilayer coating for carbon/carbon composites at high temperatures 认领 引用 被引量：14
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作者 李贺军 姚西媛 +2 位作者 张雨雷 姚栋嘉 王少龙 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2094-2099,共6页
To improve the anti-oxidation ability of silicon-based coating for carbon/carbon （C/C） composites at high temperatures, a ZrB2 modified silicon-based multilayer oxidation protective coating was prepared by pack ceme... To improve the anti-oxidation ability of silicon-based coating for carbon/carbon （C/C） composites at high temperatures, a ZrB2 modified silicon-based multilayer oxidation protective coating was prepared by pack cementation. The phase composition, microstructure and oxidation resistance at 1773, 1873 and 1953 K in air were investigated. The prepared coating exhibits dense structure and good oxidation protective ability. Due to the formation of stable ZrSiO4-SiO2 compound, the coating can effectively protect C/C composites from oxidation at 1773 K for more than 550 h. The anti-oxidation performance decreases with the increase of oxidation temperature. The mass loss of coated sample is 2.44% after oxidation at 1953 K for 50 h, which is attributed to the decomposition of ZrSiO4 and the volatilization of SiO2 protection layer. 展开更多
关键词 C/C composites coating ZrB2 anti-oxidation properties
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Preparation and properties of C/C-ZrB2-SiC composites by high-solid-loading slurry impregnation and polymer infiltration and pyrolysis(PIP) 认领 引用 被引量：19
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作者 Li-ping RAN Fei RAO +2 位作者 Ke PENG Huan YIN Mao-zhong YI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第10期2141-2150,共10页
Ultrahigh-temperature ceramics were added to C/C composites to meet their application requirement in a high-temperature oxidizing environment. C/C-ZrB2-SiC composites were fabricated by high-solid-loading slurry impre... Ultrahigh-temperature ceramics were added to C/C composites to meet their application requirement in a high-temperature oxidizing environment. C/C-ZrB2-SiC composites were fabricated by high-solid-loading slurry impregnation with polymer infiltration and pyrolysis. The dispersion and rheological behavior of ZrB2 slurry and the microstructural, mechanical, and ablation properties of the C/C-ZrB2-SiC composites were investigated. Results indicated that a well-dispersed and low-viscosity ZrB2 slurry was obtained using 0.40 wt.% polyethyleneimine as a dispersant at pH 5. Ceramics were uniformly distributed in the short-cut fiber layer and needle-punched area. The flexural strength of the C/C-ZrB2-SiC composites was 309.30 MPa. The composites exhibited satisfactory ablation resistance under the oxyacetylene flame of 2500℃, and the mass and linear ablation rates were 0.40 mg/s and 0.91 μm/s, respectively. A continuous and compact Zr O2 layer, which could effectively reduce the diffusion rate of oxygen and protect the composites from being ablated, was formed. 展开更多
关键词 C/C-ZrB2-SiC composites microstructure mechanical properties ablation properties
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C/SiC/MoSi_2-SiC-Si multilayer coating for oxidation protection of carbon/carbon composites 认领 引用 被引量：6
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作者 张雨雷 李贺军 +2 位作者 胡志雄 李克智 张磊磊 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2118-2122,共5页
C/SiC/MoSi2-SiC-Si oxidation protective multilayer coating for carbon/carbon （C/C） composites was prepared by pack cementation and slurry method. The microstructure, element distribution and phase composition of the... C/SiC/MoSi2-SiC-Si oxidation protective multilayer coating for carbon/carbon （C/C） composites was prepared by pack cementation and slurry method. The microstructure, element distribution and phase composition of the as-received coating were analyzed by scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDS） and X-ray diffraction （XRD）. The results show that the multilayer coating was composed of MoSi2, SiC and Si. It could effectively protect C/C composites against oxidation for 200 h with the mass loss of 3.25% at 1873 K in static air. The mass loss of the coated C/C composites results from the volatilization of SiO2 and the formation of cracks and bubble holes in the coating. 展开更多
关键词 C/C composites C/SiC MoSi2 SiC multilayer coating oxidation
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A phase inversion based sponge-like polysulfonamide/SiO_2 composite separator for high performance lithium-ion batteries 认领 引用 被引量：8
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作者 Xiao Wang Gaojie Xu +5 位作者 Qingfu Wang Chenglong Lu Chengzhong Zong Jianjun Zhang Liping Yue Guanglei Cui 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第6期1292-1299,共8页
In this work,a sponge-like polysulfonamide(PSA)/SiO_2 composite membrane is unprecedentedly prepared by the phase inversion method,and successfully demonstrated as a novel separator of lithium-ion batteries(LIBs).Comp... In this work,a sponge-like polysulfonamide(PSA)/SiO_2 composite membrane is unprecedentedly prepared by the phase inversion method,and successfully demonstrated as a novel separator of lithium-ion batteries(LIBs).Compared to the commercial polypropylene(PP) separator,the sponge-like PSA/SiO_2 composite possesses better physical and electrochemical properties,such as higher porosity,ionic conductivity,thermal stability and flame retarding ability.The LiCoO_2/Li half-cells using the sponge-like composite separator demonstrate superior rate capability and cyclability over those using the commercial PP separator.Moreover,the sponge-like composite separator can ensure the normal operation of LiCoO_2/Li half-cell at an extremely high temperature of 90 °C,while the commercial PP separator cannot.All these encouraging results suggest that this phase inversion based sponge-like PSA/SiO_2 composite separator is really a promising separator for high performance LIBs. 展开更多
关键词 Polysulfonamide/SiO2 composite Phase inversion method Separator Performance enhancement Lithium-ion battery
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Non‑Magnetic Bimetallic MOF‑Derived Porous Carbon‑Wrapped TiO2/ ZrTiO4 Composites for Efficient Electromagnetic Wave Absorption 认领 引用 被引量：28
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作者 Jing Qiao Xue Zhang +7 位作者 Chang Liu Longfei Lyu Yunfei Yang Zhou Wang Lili Wu Wei Liu Fenglong Wang Jiurong Liu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第5期45-60,共16页
Modern communication technologies put forward higher requirements for electromagnetic wave(EMW)absorption materials.Metal-organic framework(MOF)derivatives have been widely concerned with its diverse advantages.To bre... Modern communication technologies put forward higher requirements for electromagnetic wave(EMW)absorption materials.Metal-organic framework(MOF)derivatives have been widely concerned with its diverse advantages.To break the mindset of magneticderivative design,and make up the shortage of monometallic non-magnetic derivatives,we first try non-magnetic bimetallic MOFs derivatives to achieve efficient EMW absorption.The porous carbon-wrapped TiO2/ZrTiO4 composites derived from PCN-415(TiZr-MOFs)are qualified with a minimum reflection loss of−67.8 dB(2.16 mm,13.0 GHz),and a maximum effective absorption bandwidth of 5.9 GHz(2.70 mm).Through in-depth discussions,the synergy of enhanced interfacial polarization and other attenuation mechanisms in the composites is revealed.Therefore,this work confirms the huge potentials of nonmagnetic bimetallic MOFs derivatives in EMW absorption applications. 展开更多
关键词 Bimetallic metal-organic framework PCN-415 MOF derivatives TiO2/ZrTiO4/C composites Electromagnetic wave absorption
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