Jinsong Zhang

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (30)37.5 Total impact

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    ABSTRACT: ZnO–Al2O3–B2O3–SiO2 (ZABS) glass powder was used as interlayer to join alumina ceramics. The effect of joining temperature on the microstructure and strength of joints was investigated. The results showed that the ZABS glass can react with alumina substrate to form a layer of ZnAl2O4 at Al2O3/glass interface. Bending test exhibited that low joining temperature (1150 °C) led to low joint strength due to the formation of pores in the interlayer, originated by high viscosity of the glass. High joining temperature (1250 °C) also resulted in low joint strength, because of large CTE (coefficient of thermal expansion) mismatch between amorphous interlayer and alumina substrate. Therefore, only when the joining temperature was appropriate (1200 °C), defect-free interface and high joint strength can be obtained. The optimum joint strength reached 285 MPa, which was the same as the base material strength.
    Journal of Materials Science and Technology -Shenyang- 09/2014; · 1.20 Impact Factor
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    ABSTRACT: AuCl3 loaded structured catalysts were prepared on SiC foam supported with pre-coated activated carbon layers. The catalytic properties of the structured catalysts towards hydrochlorination of acetylene were tested in a fixed-bed reactor with the AuCl3 loaded on activated carbon pellets as a reference. For isopyknic catalysts, the structured catalyst with only one fifth of the Au amount as that was used on the reference catalyst exhibited even a little higher acetylene conversion and much better stability than the latter no matter what the gas hourly space velocities of acetylene were used. The results indicated that the more homogeneous distribution of AuCl3 particles and better heat transfer along the fixed-bed reactor originated from the low pressure drop and high thermal conductivity of the SiC foam supported structured catalysts might be able to account for their improved efficiency and stability. It is believed that these novel structured C/Au catalysts can be potentially applied in VCM industrialization in view of their greatly reduced cost and much prolonged life.
    Journal of Materials Science and Technology -Shenyang- 05/2014; · 1.20 Impact Factor
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    ABSTRACT: Different semiconductive SiC foam supports were prepared by varying the sintering temperature and atmosphere, and with or without alkaline solution treatment and high temperature oxidation following a macromolecule pyrogenation combined with reaction bonding method. Nano-TiO2 particles were immobilized onto these SiC foam supports by a composite sol–gel method. The phase, surface morphology, the type of conduction and the photocatalytic activity of the TiO2–SiC composite photocatalysts were studied. The TiO2 coated on p-type Si-free SiC support showed the highest photocatalytic efficiency in degradation of 4-aminobenzenesulfonic acid (4-ABS) in aqueous solution as compared to that coated on n-type SiC support and p-type SiC supports with residual Si or SiO2 on the surface. The result showed that the TiO2 coatings immobilized on p-type semiconductive SiC foam supports exhibited obviously higher photocatalytic activity in comparison to that coated on n-type SiC foam support. The p–n heterojunctions formed between the p-type SiC supports and n-type TiO2 coatings might be able to account for the better charge separation and transfer as well as the photocatalytic activity of the TiO2–SiC composite photocatalyst.
    Journal of Materials Science and Technology -Shenyang- 08/2013; 19(11):1074–1078. · 1.20 Impact Factor
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    ABSTRACT: The novel SiC foam valve tray was made of thin slices of SiC foam material with a high specific surface area. Hydrodynamic performances of the novel SiC foam valve tray were studied with air-water system at atmospheric pressure. These performance parameters included pressure drop, entrainment, weeping and clear liquid height. The mass transfer efficiency of the SiC foam valve tray was measured in laboratory plate column. Compared with the F1 float valve tray, the dry pressure drop was decreased about 25%, the entrainment rate was about 70% lower at high gas load, the weeping was much better, and the mass transfer efficiency was far higher. Thus, the overall performance of the novel SiC foam valve tray was better than that of F1 float valve tray.
    Chinese Journal of Chemical Engineering 08/2013; 21(8):821–826. · 0.92 Impact Factor
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    ABSTRACT: Structured TiO2–SiC photocatalysts were prepared by coating TiO2 nanoparticles on Si incorporated SiC foam supports, and their photocatalytic activities toward degradation of organic contaminant under UV light irradiation were evaluated by taking 4-aminobenzenesulfonic acid (4-ABS) as a model contaminant. In comparison to SiC foam support and TiO2 nanoparticles the TiO2–SiC photocatalysts exhibited significantly enhanced photocatalytic performance. The effects of coating thickness of TiO2 and pore sizes of the SiC foam supports on the photocatalytic activities were studied. A synergistic photocatalytic effect between the p-type semiconductive SiC foam supports and the n-type TiO2 coating was proposed to account for this enhanced photocatalytic properties.
    Applied Catalysis B: Environmental 07/2013; 144(2014):196–202. · 5.63 Impact Factor
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    ChemCatChem 07/2013; 5(7):1713-1717. · 5.18 Impact Factor
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    ABSTRACT: A new kind of open cellular foam material with three dimensionally interconnected TiC/Ti struts was prepared by a two-step sponge-coating and high frequency induction heating process. The microstructure, composition and compression strength of the prepared TiC/Ti foam materials were characterized. It was confirmed that the incorporation of Ti into TiC resulted in an inter-bonded Ti–TiC–Ti layered structure in the struts, which enhanced the plasticity of the composite foam materials.
    Journal of Materials Science & Technology. 04/2013; 29(4):339–343.
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    Chunhai Jiang, Jinsong Zhang
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    ABSTRACT: Nanostructured titania have been intensively investigated as anode materials of Li-ion batteries for their excellent high rate performance. The size effects of TiO2 polymorphs (mainly rutile, anatase and TiO2-B) on their electrochemical performance and the latest efforts in nanoengineering titania anodes through enhancing their ionic or electronic transportation or both are reviewed in this work. We suppose that micron- or submicron-sized porous structures assembled by TiO2 nanoparticles, nanowires/nanotubes or nanosheets with a high percentage of exposing high reactive facets together with a conductive percolating network are ideal anodes not only for high rate lithium storage but also for high packing densities of the active materials.
    Journal of Materials Science and Technology -Shenyang- 02/2013; 29(2):97–122. · 1.20 Impact Factor
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    ABSTRACT: A CaO–Al2O3–SiO2 (CAS)‐based glass interlayer was developed for joining of porous alumina membrane tubes with dense alumina in this work. The results indicated that the interfacial microstructure of the joint was highly sensitive to the quench rate from the joining temperature, which rendered crystallization of CaTiSiO5 at a fast quench rate but CaAl2Si2O8 at a slow quench rate due to the interfacial reaction between the CAS glass interlayer and the substrate. An extra crystallization treatment during quench, i.e., dwelling at 800°C–900°C for 2 h, produced a multiphase interlayer consisting of LiAlSi2O6, CaTiSiO5, and CaAl2Si2O8. All joints were evaluated by the thermal shock test. The results showed that the LiAlSi2O6‐containing joint interlayer had much lower thermal shock resistance than those without LiAlSi2O6.
    Journal of the American Ceramic Society 01/2013; 96(6). · 2.43 Impact Factor
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    ABSTRACT: ZSM-5 coatings with controllable morphology, Si/Al ratio, and loading were grown on SiC foam support with zeolite precursor modified surface. A homogeneous coverage of the support (15 wt.% zeolite) by ZSM-5 crystals with an average crystal size of about 3.5 μm was reached by controlling the amount of NaCl and TPAOH. The surface modification by the zeolite precursor gel layer ensured the strong anchoring and the loading of the zeolite crystals on the SiC support. The ZSM-5/SiC foam composite catalyst showed substantial stability and yield improvement in comparison to zeolite pellets in the methanol to propylene (MTP) reaction.
    Microporous and Mesoporous Materials 11/2012; 162:152–158. · 3.37 Impact Factor
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    ABSTRACT: C/C composite was brazed to a Ni-based superalloy using an active AgCu braze with an alumina ceramic interlayer and/or a zig–zag interfacial structure between the C/C and the braze. The joint with the Al2O3 interlayer displayed perfectly bonded interface and ductile joint microstructure because the diffusion and chemical reactions of Ni and Ti are prevented, which in turn improved the joint strength due to the reduced residual stress. Moreover, the joint was significantly strengthened and toughened by the proposed zig–zag interfacial structure. The strengthening mechanism was attributed to the enlarged joining area, reduced residual stress and strong pinning effect of the braze spikes. A quite high bending strength of 73 MPa was obtained from the C/C-superalloy joint with the zig–zag interfacial structure.
    Journal of the European Ceramic Society 07/2012; 32(8):1769–1774. · 2.36 Impact Factor
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    ABSTRACT: A simple technique was developed to join C/C composite to Cu using active Cu–3.5Si braze for nuclear thermal applications. The brazing alloy exhibited good wettability on C/C substrate due to the reaction layer formed at the interface. A strong interfacial bond of the brazing alloy on C/C with the formation of TiC + SiC + Ti5Si3 reaction layer was obtained. The produced CC/Cu/CuCrZr joint exhibited shear strength as high as 79 MPa and excellent thermal resistance during the thermal shock tests.
    Journal of Nuclear Materials 02/2012; 421(s 1–3):28–31. · 2.02 Impact Factor
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    ABSTRACT: Two SiC corrugated structured packings are developed: one being smooth plate and the other made of porous SiC foam. Accordingly, a macroscale three-dimensional (3D) geometric module of two corrugated sheets is introduced with a periodic boundary and a microscale computational geometry is gained from arrayed tetrakaidecahedrons. Single-phase modeling is carried out in the macro module to determine the dry pressure drops for the two types of packing. The results show that the porous SiC packing has a higher pressure drop than that of the smooth one. Two-phase flow for smooth packing is simulated with a VOF-like model provided by CFX in the macroscale geometry. It is found that openings in corrugated plates can improve the film distribution and mass-transfer efficiency. Microsimulation of two-phase flow in the porous SiC packing is performed, and the results prove that liquid can go inside the SiC foam and extend along the foam matrix with a velocity. Therefore, the porous foam can provide a larger effective gas–liquid interfacial area for mass transfer, which explains its larger theoretical plate number, compared to the smooth packing. Performance parameters including pressure drop and liquid holdup have been measured to validate the simulation method, while the distillation experiments have been carried out to study the mass-transfer efficiency of the novel SiC packings.
    Industrial & Engineering Chemistry Research. 12/2011; 51(2):915–924.
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    Chuanwei Zheng, Zhenming Yang, Jinsong Zhang
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    ABSTRACT: The oxidation behavior of reaction-bonded porous silicon carbide (RPSC) ceramics in dry oxygen between 1100° and 1500°C was investigated based on four specimens with different porosities. RPSC ceramics exhibited a rapid mass increase in the initial stage of oxidation but a slow mass increase in the following oxidation, which was considerably different from the oxidation behavior of dense SiC. The oxidation kinetics for RPSC can be better represented by an asymptotic law rather than the parabolic law for dense SiC. We suppose that, although oxidation occurred in the entire pore channels at the beginning, the pores were rapidly blocked by the oxide as their growth rate near the pore mouth was very fast due to sufficient oxygen. As the result, the oxidation of the pore interior was stopped in the absence of further oxygen supply.
    Journal of the American Ceramic Society 03/2010; 93(7):2062 - 2067. · 2.43 Impact Factor
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    ABSTRACT: This paper presents experimental and numerical studies of the pressure drop in ceramic foams for solar air receiver applications. There are three main aims in this study. The first is to measure the pressure drop in the studied ceramic foams, and to build an empirical model based on the experimental results and a parametric numerical simulation. The second aim is to study flow field characteristics in the ceramic foams, especially in the vicinity of the interface. The third is to study the pressure drop characteristics of two modified structures (by manufacturing holes on the ceramic foams) that are expected to decrease the pressure drop in ceramic foams, but maintain good heat transfer properties. The experimental results from the samples, including two modified structures, along with the simulation results, show that the pressure drop in the ceramic foams follows a modified Darcy relationship. The experimental results also show that the two modified structures dramatically decrease the pressure drop (with pressure drop decreases up to 70% at a superficial velocity of 5 m/s). Based on both the experimental and the simulation results, a generalized model for predicting the pressure drop in ceramic foams was proposed.
    Applied Energy. 01/2010;
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    ABSTRACT: In this paper, the effective thermal conductivity k eff of three-dimensional (3D) reticulated SiC foams were investigated through experimental and numerical methods. The results showed that the k eff of SiC foams increases as the volume fraction f increases from 30% to 50%. However, there are no systematic changes detected in k eff when the cell size of the foam varies at a fixed volume fraction. The k eff of SiC foams as a function of f was obtained. Compared the experimental results with the calculated ones, it indicated that the outcome can be widely applied in estimating the effective thermal conductivity of other foam materials.
    Journal of Porous Materials 01/2009; 16(1):65-71. · 1.35 Impact Factor
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    ABSTRACT: In this paper, a three-dimensional (3D) model was proposed for predicting the flow characteristics and permeability of three-dimensional reticulated foam materials, which were prepared by replication process. Parameters, such as permeability, inertia coefficient, and friction factor, were obtained in order to describe the fluid flow characteristics of porous media. The influence of foam structure on the fluid flow characteristics was elucidated. Three flow regimes in porous media, including Darcy's regime, Forchheimer's regime and Froude's regime, were visualized and discussed. The flow transition from linear (Darcy's regime) to nonlinear (Forchheimer's regime) behavior, which is typical of experiments, was founded in the simulation. The data presented revealed the fact that the numerical results are in agreement with the experimental ones published previously.
    Chemical Engineering Journal - CHEM ENG J. 01/2008; 140(1):562-569.
  • Hongtao Zhang, Jinsong Zhang, Hongyan Zhang
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    ABSTRACT: Electromagnetic wave absorbing properties of SiC-foams and their composites with SiO2 as matrix are presented, including theory, numerical analysis, and results/discussion. The reflection coefficients of various SiC-foams and their composites with various dielectric parameters are calculated by numerical simulation. When SiC conductivities are in the range of 2–3Sm−1 in the case of SiC-foams, or 2–5Sm−1 in the case of composites, the minimum reflection coefficients can be obtained in the range of X-band of 8.2–12.4GHz. These materials are light weight, heat-resistant, and good impedance match with the free space, and therefore, they are a good candidate as a wide-range frequency absorbent medium.
    Composites Part A Applied Science and Manufacturing 02/2007; 38(2):602-608. · 3.01 Impact Factor
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    ABSTRACT: Three different pore size carbon foams with variable electric conductivities were prepared by a polymer sponge replication method. The electromagnetic parameters of these carbon foams and their corresponding pulverized powders were measured by a resonant cavity perturbation technique at a frequency of 2450 MHz. The results show that carbon foams have smaller dielectric constants but several times larger dielectric loss compared with their corresponding pulverized powders. Moreover, carbon foams show magnetic loss while no magnetic loss can be observed from their corresponding pulverized powders. The magnetic loss of carbon foams is apparently a kind of extrinsically magnetic loss and believed to be able to maintain at high temperatures. The electromagnetic characteristics of carbon foams demonstrate that macrostructure modification is an effective way to modulate electromagnetic properties of such materials.
    Carbon. 01/2007;
  • Hongtao Zhang, Jinsong Zhang, Hongyan Zhang
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    ABSTRACT: SiC-foams and their composites were studied as novel stealthy materials by numerical simulations. The reflection coefficients of various SiC-foams are found to be strongly dependent on the SiC volume fractions, electric conductivities and frequency. A foaming SiC allows to reach high level of electromagnetic wave absorbing ability when the SiC volume fraction and the conductivity at proper values comparing to SiC-particles and SiC-bulk, Which due to an increase of electromagnetic energy dissipation in foaming structures and an improvement of the conjugation condition with free space. It is of most importance that SiC-foams exhibit artificial magnetic properties that can absorb the magnetic energy of electromagnetic waves. The electromagnetic absorbability of the silica composites are significantly decreased compared to that of the SiC-foams alone for the larger impedance mismatch with free space.
    Computational Materials Science - COMPUT MATER SCI. 01/2007; 38(4):857-864.

Publication Stats

85 Citations
37.50 Total Impact Points

Institutions

  • 2006–2014
    • Chinese Academy of Sciences
      • Institute of Metal Research
      Peping, Beijing, China
    • University of Toledo
      • Department of Mechanical, Industrial and Manufacturing Engineering
      Toledo, OH, United States
  • 2005–2013
    • Northeast Institute of Geography and Agroecology
      • Institute of Metal Research
      Beijing, Beijing Shi, China