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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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Complex Impedance Spectra Analysis of SnO_2-glaze Composites 认领 引用 被引量：3
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作者 颜东亮 吴建青 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第4期121-125,共5页
SnO2-glaze composites were prepared by Sb-doped SnO2 and SiO2-CaO-Al2O3-B2O3 glaze. The composites changed from an electrical insulator to a conductor as the SnO2 content increased from Owt% to 90 wt% . The complex im... SnO2-glaze composites were prepared by Sb-doped SnO2 and SiO2-CaO-Al2O3-B2O3 glaze. The composites changed from an electrical insulator to a conductor as the SnO2 content increased from Owt% to 90 wt% . The complex impedance spectra of the fabricated composites were investigated in the frequency range of 100Hz-40 MHz and three kinds of typical shape of complex impedance spectra were recorded and analyzed. The ,spectrum is quite close to the model of conduction via nonohmic contactiug when the SnO2 content is relatively low, In high loading region, the spectrum shows the conduction pattern through ohmic contact chains . In the moderate loading region, the model is a mixture of the above two models. Equivalent circuit of the composite changes from resistor-capacitor circuit to resistor-inductor circuit as the content of SnO2 increases. 展开更多
关键词 SnO2-glaze composites impedance spectra conduction model
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Preparation and electrocatalytic property of Au-Pt/SnO2/GC composite electrode 认领 引用
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作者 YU Zhihui XIE Jia +2 位作者 BAI Jie TIAN Mi XIA Dingguo 《Rare Metals》 SCIE EI CAS 2009年第4期350-354,共5页
Au-Pt/SnO2/GC composite electrode was prepared by self-assembling Au-Pt nanoparticles on SnO2 film,which was deposited on actived glassy carbon(GC).Atomic force microscopy(AFM)and scanning electron microscopy(SEM)imag... Au-Pt/SnO2/GC composite electrode was prepared by self-assembling Au-Pt nanoparticles on SnO2 film,which was deposited on actived glassy carbon(GC).Atomic force microscopy(AFM)and scanning electron microscopy(SEM)images revealed that dense and uniform Au-Pt particles with 25-nm diameter were dispersed on SnO2 film.X-ray photoelectron spectroscopy(XPS)results proved that there was an interaction between Au-Pt nanoparticles and SnO2 support.Electrochemical experiments showed that Au-Pt/SnOz/GC composite electrode had a good electrocatalytic activity to the oxidation of methanol. 展开更多
关键词 electrochemistry composite electrode self-assembling Au-Pt SnO2 methanol oxidation
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Enhanced ionic conductivity in a novel composite electrolyte based on Gd-doped SnO2 nanotubes for ultra-long-life all-solid-state lithium metal batteries 认领 引用 被引量：2
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作者 Lugang Zhang Nanping Deng +7 位作者 Junbao Kang Xiaoxiao Wang Hongjing Gao Yarong Liu Hao Wang Gang Wang Bowen Cheng Weimin Kang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第2期326-337,I0009,共12页
All-solid-state electrolytes are exceedingly attractive because of the outstanding inherent safety and energy density compared to liquid electrolytes.Whereas,it is still formidable to simultaneously design solid elect... All-solid-state electrolytes are exceedingly attractive because of the outstanding inherent safety and energy density compared to liquid electrolytes.Whereas,it is still formidable to simultaneously design solid electrolytes with favorable electrode/electrolyte interface compatibility and high ionic conductivity in a simple and scalable manner.Hence,the oxygen-vacancy-rich Gd-doped SnO2 nanotubes(GDS NTs)are innovatively prepared and applied to the electrolyte of all-solid-state lithium metal batteries for the first time.The addition of GDS NTs can validly construct long-range co ntinuous ion transport networks in the poly(ethylene oxide)(PEO)-based system and greatly improve the mechanical properties of the electrolyte.Compared to the PEO-based electrolyte,the composite electrolyte displays a higher lithium ion conductivity of 2.41×10-4 S cm-1 at 30℃,a higher lithium ion transference number up to 0.62 and a wider electrochemical window of 5 V at 50℃.In addition,the composite electrolyte manifests outstanding compatibility with high-voltage LiNi0.8Mn0.1Co0.1O2(NMC811)cathode,LiFePO4 cathode and lithium metal anode.The assembled Li/Li symmetric battery exhibits stable Li plating/stripping cycling performance,which can cycle steadily for 1500 h at a capacity of 0.3 mA h cm-2.And Li/LiFePO4 battery still maintains a high capacity of 131.54 mA h g-1 at 0.5C after 800 cycles,which has a superior capacity retention rate of 93.2%.The obtained novel composite electrolyte has promising application prospects in the field of all-solid-state lithium metal cells. 展开更多
关键词 All-solid-state lithium metal batteries Gd-doped SnO2 nanotubes Interfacial stability Oxygen vacancies Solid-state composite electrolytes
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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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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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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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High temperature oxidation and ablation behaviors of HfB2-SiC/SiC coatings for carbon/carbon composites fabricated by dipping-carbonization assisted pack cementation 认领 引用 被引量：7
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作者 Lei Zhou Jiaping Zhang +5 位作者 Dou Hu Qiangang Fu Wuqing Ding Jiaqi Hou Bing Liu Mingde Tong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第16期88-98,共11页
To improve the uniformity and the content of HfBin Hf B-Si-based ceramic coating and alleviate the damage of substrate,and then enhance the high-temperature(1700°C)oxidation and cyclic ablation resistances of car... To improve the uniformity and the content of HfBin Hf B-Si-based ceramic coating and alleviate the damage of substrate,and then enhance the high-temperature(1700°C)oxidation and cyclic ablation resistances of carbon/carbon composites,a close-knit double layer HfB2-SiC/SiC coatings with a mosaic structure and high content of HfBwere prepared by a novel dipping-carbonization assisted pack cementation methods(DPC–HS/S).In contrast,a HfB2-SiC/SiC coatings were also fabricated by pack cementation(PC–HS/S).Results revealed that the oxidation and ablation protective performances of the DPC–HS/S coatings were superior to those of PC–HS/S coatings.After 30 thermal cycles between 1500°C and room temperature,the mass gain of the coated sample was 0.78%,and the mass loss was 1.65%after oxidation at 1700°C for 156 h.Moreover,under an oxyacetylene torch ablation for 180 s(3 cycles),the linear ablation rate of the DPC–HS/S coated specimen was 1.62μm/s,which was much lower than that of PC–HS/S coated specimen(3.08μm/s). 展开更多
关键词 C/C composites HfB2 Oxidation resistance CyCliC ablation resistance
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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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Ablation behaviour and mechanical performance of ZrB2-ZrC-SiC modified carbon/carbon composites prepared by vacuum infiltration combined with reactive melt infiltration 认领 引用 被引量：4
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作者 ZHANG Jia-ping SU Xiao-xuan +2 位作者 LI Xin-gang WANG Run-ning FU Qian-gang 《新型炭材料（中英文）》 SCIE EI CAS CSCD 北大核心 2024年第4期633-644,共12页
The development of advanced aircraft relies on high performance thermal-structural materials,and carbon/carbon com-posites(C/C)composited with ultrahigh-temperature ceramics are ideal candidates.However,the traditiona... The development of advanced aircraft relies on high performance thermal-structural materials,and carbon/carbon com-posites(C/C)composited with ultrahigh-temperature ceramics are ideal candidates.However,the traditional routes of compositing are either inefficient and expensive or lead to a non-uniform distribution of ceramics in the matrix.Compared with the traditional C/C-ZrC-SiC composites prepared by the reactive melt infiltration of ZrSi2,C/C-ZrB2-ZrC-SiC composites prepared by the vacuum infiltration of ZrB2 combined with reactive melt infiltration have the higher content and more uniform distribution of the introduced ceramic phases.The mass and linear ablation rates of the C/C-ZrB2-ZrC-SiC composites were respectively 68.9%and 29.7%lower than those of C/C-ZrC-SiC composites prepared by reactive melt infiltration.The ablation performance was improved because the volatilization of B2O3,removes some of the heat,and the more uniformly distributed ZrO2,that helps produce a ZrO2-SiO2 continu-ous protective layer,hinders oxygen infiltration and decreases ablation. 展开更多
关键词 C/C composites ZrB2-ZrC-SiC Vacuum filtration Reactive melt infiltration Ablation.
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Composite rock-breaking of high-pressure CO2jet&polycrystallinediamond-compact(PDC)cutter using a coupled SPH/FEM model 认领 引用 被引量：6
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作者 Can Cai Pei Zhang +2 位作者 Daping Xu Xianpeng Yang Yingfang Zhou 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2022年第5期1115-1124,共10页
CO2 drilling is a promising underbalance drilling technology with great advantages,such as lower cutting force,intense cooling and excellent lubrication.However,in the underbalance drilling,the mechanism of the cou... CO2 drilling is a promising underbalance drilling technology with great advantages,such as lower cutting force,intense cooling and excellent lubrication.However,in the underbalance drilling,the mechanism of the coupling CO2 jet and polycrystalline-diamond-compact(PDC)cutter are still unclear.Whereby,we established a coupled smoothed particle hydrodynamics/finite element method(SPH/FEM)model to simulate the composite rock-breaking of high-pressure CO2 jet&PDC cutter.Combined with the experimental research results,the mechanism of composite rock-breaking is studied from the perspectives of rock stress field,cutting force and jet field.The results show that the composite rock-breaking can effectively relieve the influence of vibration and shock on PDC cutter.Meanwhile,the high-pressure CO2 jet has a positive effect on carrying rock debris,which can effectively reduce the temperature rising and the thermal wear of the PDC cutter.In addition,the effects of CO2 jet parameters on composite rock-breaking were studied,such as jet impact velocity,nozzle diameter,jet injection angle and impact distance.The studies show that when the impact velocity of the CO2 jet is greater than 250 m/s,the CO2 jet could quickly break the rock.It is found that the optimal range of nozzle diameter is 1.5–2.5 mm,the best injection angle of CO2 jet is 60,the optimal impact distance is 10 times the nozzle diameter.The above studies could provide theoretical supports and technical guidance for composite rock-breaking,which is useful for the CO2 underbalance drilling and drill bit design. 展开更多
关键词 C02drilling High-pressure C02jet&PDC cutter Composite rock-breaking Experimental study SPH/FEM method
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无水硼砂对Al2O3-C复合材料性能与显微结构的影响 认领 引用
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作者 吴嵩 韦龙杰 +3 位作者 王建筑 陈继 袁愈辉 刘诚 《耐火材料》 CAS 北大核心 2026年第1期65-68,共4页
在Al2O3-C复合材料中添加低熔点相,对其性能与结构改善具有重要意义。以棕刚玉、氧化铝粉、鳞片石墨为主要原料,酚醛树脂为结合剂,加入不同量的无水硼砂(加入质量分数分别为0、1%、2%、3%和4%),采用高速逆流造粒机混合,得到的混... 在Al2O3-C复合材料中添加低熔点相,对其性能与结构改善具有重要意义。以棕刚玉、氧化铝粉、鳞片石墨为主要原料,酚醛树脂为结合剂,加入不同量的无水硼砂(加入质量分数分别为0、1%、2%、3%和4%),采用高速逆流造粒机混合,得到的混合料在冷等静压机内成型,经250℃干燥、1000℃埋碳烧成,制备了Al2O3-C复合材料,研究了无水硼砂加入量对Al2O3-C复合材料性能及显微结构的影响。结果表明:随着无水硼砂加入量的增多,试样显气孔率显著下降,体积密度有所增加,但增加幅度较小;添加了无水硼砂的试样,细粉颗粒边界变得模糊,细粉之间孔隙部分被熔化后的无水硼砂所填充,从而使得显气孔率显著降低,常温抗折明强度显提升,抗氧化性能显著改善;与未添加无水硼砂的试样相比,加入4%(w)无水硼砂试样的显气孔率下降幅度约为25%,常温抗折强度的升高幅度约为5.6倍,氧化层面积下降约为60%。 展开更多
关键词 无水硼砂 Al2O3-C复合材料 性能 显微结构
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Influence of pre-synthesized Al2O3-SiC composite powder from clay on properties of low-carbon MgO-C refractories 认领 引用 被引量：8
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作者 Bei-yue Ma Xin-ming Ren +5 位作者 Zhi Gao Fan Qian Zhao-yang Liu Guo-qi Liu Jing-kun Yu Gao-feng Fu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2022年第7期1080-1088,共9页
To improve the properties of low-carbonization of MgO–C refractories,the introduction of composite additives is an effective strategy.Al2O3–SiC composite powder was prepared from clay using electromagnetic ind... To improve the properties of low-carbonization of MgO–C refractories,the introduction of composite additives is an effective strategy.Al2O3–SiC composite powder was prepared from clay using electromagnetic induction heating and carbon embedded methods.Further,the Al2O3–SiC composite powder synthesized by electromagnetic induction heating at 600 A was added into low-carbon MgO–C refractories(4 wt.%)to improve their properties.The results showed that when the addition amount of Al2O3–SiC composite powder is within the range of 2.5–5.0 wt.%,the properties of low-carbon MgO–C samples were significantly improved,e.g.,the apparent porosity of 7.58%–8.04%,the bulk density of 2.98–2.99 g cm-3,the cold compressive strength of 55.72–57.93 MPa,the residual strength after three air quenching at 1100°C of 74.86%–78.04%,and the decarburized layer depth after oxidized at 1400°C for 2 h of 14.03–14.87 mm.Consequently,the idea for the rapid synthesis of Al2O3–SiC composite powder provides an alternative low-carbon MgO–C refractories performance optimization strategy. 展开更多
关键词 MgO–C refractory Electromagnetic induction heating Al2O3–SiC composite powder Oxidation
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Facile synthesis of rutile TiO2/carbon nanosheet composite from MAX phase for lithium storage 认领 引用 被引量：3
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作者 Zhaoruxin Guan Xiaoxue Wang +3 位作者 Tingting Li Qizhen Zhu Mengqiu Jia Bin Xu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第9期1977-1981,共5页
Titanium oxide(TiO2),with excellent cycling stability and low volume expansion,is a promising anode material for lithium-ion battery(LIB),which suffers from low electrical conductivity and poor rate capability.Comb... Titanium oxide(TiO2),with excellent cycling stability and low volume expansion,is a promising anode material for lithium-ion battery(LIB),which suffers from low electrical conductivity and poor rate capability.Combining nano-sized TiO2with conductive materials is proved an efficient method to improve its electrochemical properties.Here,rutile TiO2/carbon nanosheet was obtained by calcinating MAX(Ti3AlC2)and Na2C03together and water-bathing with HC1.The lamellar carbon atoms in MAX are converted to 2D carbon nanosheets with urchin-like rutile TiO2anchored on.The unique architecture can offer plentiful active sites,shorten the ion diffusion distance and improve the conductivity.The composite exhibits a high reversible capacity of 247 mA h g^-1,excellent rate performance(38 mA h g^-1 at 50 C)and stable cycling performance(0.014%decay per cycle during 2000 cycles)for lithium storage. 展开更多
关键词 TiO2/C Composite Anode Lithium ion battery MAX
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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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Electrodeposition and Characterization of Ni/Ti_3Si(Al)C_2 Composite Coatings 认领 引用 被引量：3
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作者 Ying Liang Mingyue Liu +2 位作者 Jixin Chen Xiaoxia Liu Yanchun Zhou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2011年第11期1016-1024,共9页
Pure nickel and Ni/Ti3Si（AI）C2 composite coatings were prepared by electrodeposition method from an additive-free nickel Watt＇s bath and were characterized by X-ray diffraction, laser confocal microscopy and scanni... Pure nickel and Ni/Ti3Si（AI）C2 composite coatings were prepared by electrodeposition method from an additive-free nickel Watt＇s bath and were characterized by X-ray diffraction, laser confocal microscopy and scanning electron microscopy. The effect of current and Ti3Si（AI）C2 concentration in the solution on the composition, grain size, preferred orientation and surface morphology of the electrodeposited coatings were investigated. （200）-oriented Ni coatings could be deposited at high current （62.5 mA）, while （220）-oriented Ni coatings could be obtained at low current （25 mA）. However, the presence of Ti3Si（Al）C2 particles disturbed the surface texture of Ni crystallites in the composite coatings. Based on the simulated morphology and the observed microstructure, the mechanisms for the change of preferred orientation and crystallite shapes in the presence of Ti3Si（Al）C2 particles were discussed. Moreover, microhardness and friction properties of pure nickel and Ni/Ti3Si（Al）C2 composite coatings were also compared. 展开更多
关键词 Ni/TiaSi（Al）C2 composite coatings Electrodeposition Preferred orientation Microstructure Mechanical properties
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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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Preparation and Characterization of Tetracomponent ZnO/SiO2/SnO2/TiO2Composite Nanofibers by Electrospinning 认领 引用
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作者 Chao Song Xiangting Dong 《Advances in Chemical Engineering and Science》 CAS 2012年第1期108-112,共5页
[Zn(CH3COO)2 + PVP]/[C2H5O)4Si + PVP]/[SnCl4 + PVP]/[Ti(OC4H9)4 + CH3COOH + PVP] precursor composite fibers have been fabricated through self-made electrospinning equipment via electrospinning tech-nique. ZnO/SiO2/SnO... [Zn(CH3COO)2 + PVP]/[C2H5O)4Si + PVP]/[SnCl4 + PVP]/[Ti(OC4H9)4 + CH3COOH + PVP] precursor composite fibers have been fabricated through self-made electrospinning equipment via electrospinning tech-nique. ZnO/SiO2/SnO2/TiO2 composite nanofibers were obtained by calcination of the relevant precursor composite fibers. The samples were characterized by thermogravimetric-differential thermal analysis (TG-DTA), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), and Scanning electron microscopy (SEM). TG-DTA analysis reveals that solvents, organic compounds and inorganic in the precursor composite fibers are decomposed and volatilized totally, and the mass of the samples kept constant when sintering temperature was above 900?C, and the total mass loss percentage is 88%. XRD results show that the precursor composite fibers are amorphous in structure, and pure phase ZnO/SiO2/SnO2/TiO2 com-posite nanofibers are obtained by calcination of the relevant precursor composite fibers. FTIR analysis manifests that pure inorganic oxides are formed. SEM analysis indicates that the width of the precursor composite fibers is ca. 1.485 ± 0.043 μm. The width of the ZnO/SiO2/SnO2/TiO2 composite nanofibers is ca. 1145.098 ± 68.093 nm. 展开更多
关键词 ZnO/SiO2/SnO2/TiO2 Tetracomponent Composite Nanofibers Electrospinning
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