15 June 2014, Volume 45 Issue 11
    

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    研究 开发
  • Preparation and properties of form-stable phase change composite fibers with the GMS loading
    Hui-Zhen KE ;;Qu-Fu WEIYi-Bing CAI
    . 2014, 45(11): 2-0.
    Abstract ( ) Knowledge map Save
    An innovative type of glycerol monostearate/polyethylene terephthalate (GMS/PET) form-stable phase change composite fibers in which GMS acts as a solid-liquid phase change material and PET serves as a supporting material was successfully fabricated by electrospinning. The FE-SEM images revealed that the diameters of the form-stable phase change composite fibers gradually increased with the increasing GMS loading, whilst the wider diameter distribution and the adhesion among the composite fiber intersections could be also observed. The XRD patterns suggested that the GMS and PET exhibited good compatibility with each other and the crystallization degree of GMS in the fibers remarkably decreased resulting from the crystallization being hindered by the PET supporting skeleton. The DSC analysis showed that electrospun GMS/PET form-stable phase change composite fibers were a kind of transition reversible latent heat storage materials and the phase transition enthalpies of the composite fibers gradually increased with the increase of GMS contents. The efficiency of enthalpies was larger than 85%. Moreover, the DSC thermal cycling test indicated that the phase change temperatures and enthalpies had almost no significant variation after the thermal cycling test, suggesting that electrospun GMS/PET form-stable phase change composite fibers had good thermal reliability.
    • 综述 进展
  • Research progress on Mn-based catalysts for low-temperature selective catalytic reduction of NOx
    Yu -Ying ZHENGXie WANG
    . 2014, 45(11): 3-0.
    Abstract ( ) Knowledge map Save
    The catalyst is a key to the selective catalytic reduction (SCR) technique to remove NOx from effluent gas, the active component and the support directly determine the low-temperature activity of catalysts. Recently, Mn-based De-NOx catalyst has become a research focus in the field of flue gas catalytic denitrification, a large number of Mn-based catalysts have been developed, and its denitration performance, water-resistance as well as sulfur resistance are severely influenced by additives and supports. In this paper, the research progress of Mn-based catalysts with different supports is presented. Besides, the perspective of carbon nanotubes for the support of Mn-based catalysts is also summarized.
  • The research progress of heavy metal adsorption material
    Fei-Fei ZHANG
    . 2014, 45(11): 4-0.
    Abstract ( ) Knowledge map Save
    The heavy metal ion mainly existing in the waste water of metallury, electroplating and leather making industry. The researchers are focusing on high effective adsorption material. This paper based on the latest research paper, mainly discussed on the adsorption properties of biomass adsorption material, the modified product based on the biomass material and some novel macro molecular. The advantages and disadvantages of the adsorbent were compared. Collagen fibers have advantage of wide resource and it can be extracted from the abandoned waste leather shaving. After the chemical modification, the adsorption capacity of collagen fiber could be enhanced greatly. It will be of great use when used in the treatment of heavy metal ion contained waste water.
    • 研究 开发
  • Preparation of Li4Ti5O12 electrode material with refining sand milling technique and its electrochemical performance research
    ;;;;
    . 2014, 45(11): 5-0.
    Abstract ( ) Knowledge map Save
    Abstract：The nano Li4Ti5O12 was prepared in the solid phase synthesis process with refining sand milling technique was used. In the experiment we found that the sand milling time is the key factor for the microstructure of Li4Ti5O12 and its electrochemical performance. The XRD patterns showed that the product remained spinel structure as usual after sand milling process. The particle size distribution and SEM images showed that the average particle size decreased from 500nm to 370nm with the higher dispersivity. Also, the rate capability of the product was improved of about 10~20mAh/g at the each current intensity after the sand milling process, and this active result will be more clearly at the higher current intensity. Also, the product remains good stability, and the capability has no decrease after 100 times cycling.
  • Study of foamed concrete with shrinkage-reducing admixtures on shrinkage
    Jun JIANG
    . 2014, 45(11): 6-0.
    Abstract ( ) Knowledge map Save
    To prevent cracking caused by shrinkage, pore structure, drying shrinkage and autogenous shrinkage of foamed concrete with SRA (S1 and S2), were studied by testing drying shrinkage and autogenous shrinkage and analyzed by MIP, BET, XRD, when the water cement ratios were 0.33 and 0.50. The result showed that water loss and drying shrinkage of foamed concrete focused in 7 days. The decreased values of drying shrinkage and autogenous shrinkage of 28 days on foamed concrete were up to 55.3% and 48.9%, when water cement ratio was 0.33. In the water cement ratio 0.50, drying shrinkage of 28 days on foamed concrete decreased by 59.1% to the most. And tiny expansion of foamed concrete happened when it was isolated from outside. The mount of capillary pores in foamed concrete were decreased by adding S1 with w/c=0.33 and 0.5. But in the water cement ratio 0.33, the mount of small capillary pores reduced, and the mount of big capillary pores that pore diameter was about 30nm became more. In the water ratio 0.50, the mount of small capillary pores which pore diameter was only smaller than 4nm increased.
  • A study on active and passive energy-saving evaluation method of phase change energy storage wallboard
    Quan ZHOU ;;;
    . 2014, 45(11): 8-0.
    Abstract ( ) Knowledge map Save
    For the evaluation of phase change energy storage wallboard’s thermal performance both in active and passive energy-saving building, three indicators-relative time lag rate, energy efficiency and peak temperature difference were proposed according to the characteristics of the phase change material (PCM). On this basis, energy-saving evaluation device was developed, by which the phase change wallboard and reference wallboard were tested contrastively. The wallboard’s energy-saving performance in active and passive energy-saving buildings and effect to indoor thermal environment were studied and evaluated. Results showed that the wallboard of 5% PCM’s temperature rose 8.5% slower from the initial temperature to the upper limit of human comfortable temperature than that of reference wallboard, saved 23% of electricity to keep indoor comfort temperature, and 0.9oC lower in peak temperature. Adding of PCM improved the energy-saving efficiency of building and also improved indoor living environment which has a high value in engineering.
  • Effect of Thermal Activation on Tribological Property of Attapulgite as Lubricating Material
    . 2014, 45(11): 9-0.
    Abstract ( ) Knowledge map Save
  • Effect of polyvinyl butyral on the glass/ceramic tape and sintering properties
    ;Hongqing Zhou ;;
    . 2014, 45(11): 10-0.
    Abstract ( ) Knowledge map Save
    In this paper, the borosilicate glass/Al2O3 tape was prepared with the binder system of polyvinyl butyral (PVB) by tape casting. The effect of PVB on the bulk density, the microstructure and mechanical property of green tape was detailly studied. The results showed that: with the decreasing of molecular weight and hydroxyl content of PVB, the decomposition temperature, the tensile strength and breaking elongation of green tape were reduced; the bulk density was increased; the density of the sintered ceramic and dielectric property was not obvious.
  • Effect of Polymer Concentration and Coagulation Bath on the Performance of PES/PMMA Ultrafiltration Membranes
    Kui Li;;;ma-tai DING;
    . 2014, 45(11): 11-0.
    Abstract ( ) Knowledge map Save
    The effect of polymer concentration, coagulation bath temperature and bore liquid concentration on the performance of PES/PMMA blend hollow-fiber membranes, which were fabricated by phase inversion process were investigated. The addition of PMMA could improve hydrophilicity and overall performance of PES membrane. The results demonstrated that the pure water flux decreased gradually when the polymer concentration increased from 15% to 20%. However, the rejection and tensile strength increased. With the increase of coagulation bath temperature from 20℃ to 60℃, the pure water flux gradually increased, whereas both the rejection and tensile strength gradually decreased. In addition, with the increase of DMAc content in bore liquid, double finger-shaped voids on the cross-section of PES/PMMA hollow fiber membranes gradually transformed to a single row of finger voids. Meanwhile, the pure water flux first decreased and then increased. On the contrary, rejection decreased after slightly increasing, but tensile strength increased gradually.
  • Influence of different binder materials on the performance of lithium-sulfur batteries
    ;Xiao-Lan CUI;zhongqiang SHAN;
    . 2014, 45(11): 12-0.
    Abstract ( ) Knowledge map Save
    Ball milling in combination with heat treatment was used to prepare S/C composite cathode materials (sulfur containing is 42wt%) . In this paper, the effects of different binders PTFE, gelatin and PEO for lithium-sulfur battery were studied respectively. Cyclic voltammetry (CV) and constant current charge-discharge characterized the electrochemical properties. The results showed that gelatin and PTFE as a binder presented positive evaluations for the electrochemical performance of sulfur positive electrode. In the experiment, the discharge capacity retains 741.2mAhg-1 (based on sulfur weight) after 50 for PTFE at 0.2C. Gelatin as a binder, the discharge capacity was 788mAhg-1 during the 50 cycle for the cathode at the current of 0.2C.
  • Influence of chloride ingress on the microstructure and water sorptivityof the surface layer of concrete
    . 2014, 45(11): 13-0.
    Abstract ( ) Knowledge map Save
    In this study, the influences of different immersion conditions on the pore structure and surface layer sorptivity are investigated. After cured for 28 days under standard conditions, concrete specimens with different mix proportions are immersed in ultrapure water and 5% NaCl solution, and Autoclam (a surface sorptivity tester) is used to measure the evolution of surface sorptivity of the concrete specimens following time. In parallel, paste particles taken from the specimens are cured and immersed under the same conditions, and used for pore structure characterization. It is found that immersion in NaCl solution can significantly improve the surface water-absorption resistance of concrete as compared with the ultrapure water immersion. For example, for concrete PC1, at the immersion age of 90 days, the surface water-sorptivity of concrete immersed in NaCl solution is 0.91 of the specimen immersed in ultrapure water, while this factor decreases to 0.76 at the immersion age of 150 days. This influence can be attributed to the fact that the penetration of chloride ions into concrete makes the pore structure finer, and reduces the volume fraction of pores under 100 nm. It’s found in experiments that for PC1, the volume of pores under 100 nm in specimens under NaCl solution immersion is 32.42% lower than that under ultrapure water immersion, and this ratio is 57.24% for PC2. It is proved that chloride ions facilitate the hydration of cement, thus the immersion in NaCl solution helps cement paste in concrete achieving better hydration and denser microstructure.
  • Effects of EVA emulsion addition on magnesium phosphate cement performances
    ;;
    . 2014, 45(11): 14-0.
    Abstract ( ) Knowledge map Save
    Raw material selection is an essential and important way to improve the performance of magnesium phosphate cement (MPC). Using EVA emulsion to modify MPC to expand its application scope was investigated. The results show that: 1) the impact of EVA emulsion addition in MPC on its setting time and fluidity is insignificant; 2) with the increase of mixing amount of EVA emulsion, the compressive strength and the flexural strength of MPC both appear a trend of initial increase and subsequent decrease, but with different optimum dosage; and 3) addition of EVA emulsion can significantly increase MPC bond strength and fracture energy. Further microscopic analysis indicates that addition of EVA emulsion does not change the types of hydration products, but change the hydration rate and the morphology formation of hydrated products, e.g.，MgNH4PO4?6H2O mainly exists as columnar forms and with more condensed structure.
  • Effect of acid treatment of lignite semi-coke on its surface properties and mercury removal performance
    Li WANG ;;
    . 2014, 45(11): 15-0.
    Abstract ( ) Knowledge map Save
    Abstract: The mercury removal performance of lignite semi-coke modified with concentration of 25%HNO3 or 25%H2SO4 solution has been investigated in a fixed bed adsorption apparatus with nitrogen as a carrier gas to carry mercury vapor, and the influence factors for mercury removal were also analysied. The surface physical and chemical properties of semi-coke modified by sulfuric acid (S-SC) and semi-coke modified by nitric acid (N-SC) were characterized by methods of acid-base titration, Boehm tirast, Brunauer-Emmett-Teller (BET) measurements, X-ray powder diffraction (XRD) and Fourier Transform infrared spectroscopy (FTIR). The results show that the oxidation of nitric acid or sulfuric acid results in the decrease in ash content of semi-coke and the increase in content of oxygen, nitrogen and the sulfonic acid groups of modified semi-cokes. Compared with lignite semi-coke (NM-SC), the N-SC sample can improve mercury removal efficiency from flue gas at temperature of 30 ℃ and 140 ℃, while the S-SC sample only enhance the mercury removal efficiency at 140 ℃ , these results are related to the surface properties of semi-coke modified by acid and its content of acidic functional groups.
  • Synthesis and adsorption of 8-hydroxyquinoline modified DK110 resin for Cu2+
    Chun-ping Liu ;;;
    . 2014, 45(11): 16-0.
    Abstract ( ) Knowledge map Save
    A novel 8-hydroxyquinoline modified DK110 resin(HQDK110) was synthesized by using weak-acidic macroporous acrylic acid resin DK110 as macromolecular skeleton through graft modification of 5-chloromethyl 8-hydroxyquinoline on it. The static,dynamic adsorption and desorption properties of Cu2+ on the HQDK110 resin were researched respectively under different temperature, pH value and metal ion concentration. The results showed that the resin had good adsorption effect to Cu2+, and adsorption capacity was 2.278 mmol.g-1 under experimental conditions when the temperature was 25℃. Adsorption process was better described by the pseudo second-order kinetics equation and Langmuir adsorption isotherm. The removal efficiency of Cu2+ was found to be more than 98% in wide concentration range and desorption efficiency was to 96.88% in 0.1 mol.L-1 HCl solution. The resin had good reusability.
  • Normal Growth Kinetics of L-alanine doped ZTS crystals and Chemical Etching studies
    ;;;min cheng
    . 2014, 45(11): 17-0.
    Abstract ( ) Knowledge map Save
    Via studying the normal growth rates of the (100), (010) and (001) faces of ZTS crystal under different doping concentrations of L-alanine, we found that the normal growth rate of ZTS crystal increased linearly with the increase of supersaturation. With increase of doping concentration, L-alanine addition led to an initial increase and then a decrease of the normal growth rate of the (100) face. However, L-alanine doping led to a decrease first, followed by an increase and then a decrease again of the normal growth rates of the (010) and (001) faces. The growth of (100) face is featured mainly by the dislocation mechanism, and the growth of (010) and (001) faces are, however, featured by the continuous growth model as supported by the experimental results. Well-defined dislocation pits of rectangular shape were observed on the chemical etching （100） face of ZTS crystal by using optical microscopy. The dislocation density of (100) face is 33-308mm-2. Study results indicated that dislocation density could be minimized when L-alanine concentration was set at 1mol%．
  • Comparative Study on the flame retarding and smoke suppressing properties of Wood Treated by manganese compounds
    . 2014, 45(11): 18-0.
    Abstract ( ) Knowledge map Save
    Abstract: Manganese has catalytic action on many chemical reactions, however, whether manganese compounds have the effects of flame retardant and smoke suppression is not clear. CONE) and TG were used to analyze the combustion properties, smoke-release properties, and carbonization characteristics of liriodendron treated by two important inorganic manganese compounds-- manganese carbonate and manganese chloride. The results show that: relative to the untreated wood panels, the THR of wood panels treated with two manganese compounds respectively decreased by 24.27% and 39.40%, TSP decreased by 31.18% and 93.27% and mean-COY reduced 12.0% and 36.0% when the addition level of manganese carbonate and manganese chloride is 10%, indicating that both manganese carbonate and manganese chloride have effect on flame-retardation, suppressed smoke and toxic gases, manganese chloride is better than manganese carbonate. The date of thermogravimetric analysis, cone calorimetry and the SEM picture of residual carbon show that: the flame retardancy and smoke suppression effect of manganese chloride is better than manganese carbonate, because manganese chloride catalyzed wood into more carbon at high temperatures, carbon layer was more compact and stable, which can effectively reduce the heat release rate and smoke production rate of wood, reduce the risk of fire wood effectively.
  • Performance of Microbe Cementitious Materials materials
    Hui RONG
    . 2014, 45(11): 19-0.
    Abstract ( ) Knowledge map Save
    The sandstone, which is 50 cm of height, 5 cm of diameter, is cemented successfully by microbe cement. The compressive strength, the freeze-thaw cycle and water wash resistance of bio-sandstone under different positions distance from the injection ports are analyzed, respectively. The results showed that the compressive strengths of bio-sandstone as far away from the bacteria injection port are all decreased. The bio-sandstone of 0-30 cm distance from injection port has good freeze-thaw resistance, however, it has poor freeze-thaw resistance when the distance as far away from the injection port is over 30 cm. The different positions of bio-sandstone that is cemented by microbe cement after 12 h water wash are all good wash water resistance
  • Pavement Cooling Performance of Tourmaline Modified Asphalt Concrete
    . 2014, 45(11): 20-0.
    Abstract ( ) Knowledge map Save
    In order to solve the high temperature problem of asphalt pavement in summer, tourmaline modified asphalt was developed and its concrete was prepared. Firstly, the most reasonable pavement temperature test method was determined from several aspects including the specimen preparation, test instruments, temperature measuring position, heat insulation way. Then the influence laws of pavement cooling performance with the outside temperature, the types and mixing amount of tourmaline were systematically studied. Finally, the pavement cooling mechanism and road properties of tourmaline modified asphalt concrete were further analyzed. Experimental results indicate that: tourmaline can significantly reduce the surface temperature of asphalt pavement. The higher outside temperature is, cooling performance of tourmaline modified asphalt concrete is better; in the daytime, cooling effect of tourmaline modified asphalt concrete in high temperature period is better than that of low temperature periods. Pavement cooling performance of tourmaline modified asphalt concrete is improved with the increase of tourmaline mixing amount, and the cooling performance variation become unobvious while the mixing amount of tourmaline is more than 17%. For different types of tourmaline, the cooling performance of tourmaline anion powder is better than tourmaline powder, improved with the increase of anion releasing amount, but the variation is not obvious while anionic releasing amount exceeding 5000ions. Road properties tests show that the adding of tourmaline can significantly improve the high temperature performance, low temperature performance and the water stability of asphalt concrete.
  • Design and simulation of metamaterial electromagnetic invisible wavelength-transformer
    Ye LIU; ;
    . 2014, 45(11): 21-0.
    Abstract ( ) Knowledge map Save
    Novel functional metamaterial electromagnetic invisible device called “wavelength transformer” are proposed and designed, based on Pendry’s coordinate transformation theory. The device can guide incoming electromagnetic (EM) waves to propagate in its inner region and the waves return to their original propagation without distorting outside the device. Besides, the device can also change the wavelength of the incoming EM waves inside its inner region without EM scattering. After the derivation of the permittivity and permeability tensors of the transformer are accomplished, full-wave simulations are given to validate these expressions of constitutive tensors.
  • Research of Critical-slowing-down during the pre-roughness process of GaAs surface
    Luo Zijiang
    . 2014, 45(11): 22-0.
    Abstract ( ) Knowledge map Save
    Pre-roughness process of GaAs surface was studied using reflection high energy electron diffraction and scanning tunneling microscopy. We found that there was distinct difference in surface morphology at different temperature(570℃、560℃、550℃、540℃、530℃) under a special As BEP(0.01μTorr). With the temperature decreasing, an obvious delay was discovered in pre-roughness process of GaAs surface, and this process should not onset when the temperature below 530℃. The critical slowing down theory was introduced to explain experimental phenomena and calculated the critical temperature of GaAs(001) roughening through the experiment data and the related theoretical model, and this theoretical result (529℃) was kept with experiment consequence(530℃).
  • The research of preparing compound doped lithium iron phosphate by comprehensive utilization of chromium iron alloy
    ; PENG Zhong-Dong ;
    . 2014, 45(11): 23-0.
    Abstract ( ) Knowledge map Save
    The oxalic acid was employed to precipitate the ferrum, nickel cobalt and manganese from the leaching sulfate solution of ferrochrome alloy. Small amount of nickel, cobalt and manganese exited in ferrochrome alloy were precipitated simultaneously in ferrous oxalate. The classic solid state route was applied to prepare LiFe(1-x)MxPO4/C by using above Fe(1-x)MxC2O4 as raw material. Crystal structure and charge/discharge performance of LiFe(1-x)MxPO4/C were investigated by X-ray diffraction and electrochemical measurement, respectively. The LiFe(1-x)MxPO4/C shows the outstanding electrochemical performance. The discharge capacity is 162mAh/g at the rate of 0.1 C . When cycled at 1C for 50 times, the capacity retention is 98.2%.
  • Fabrication and magnetic properties studies of BaMn0.5Co0.5Zr1Fe10O19 ceramics
    Yong Ren
    . 2014, 45(11): 24-0.
    Abstract ( ) Knowledge map Save
    Mn-Co-Zr substituted BaM ferrite particles are prepared by the sol-gel method, the influence of heat treatment temperature, milling time on microstructure and magnetic properties were studied. Phase structure and microscope image of sample were investigated by X-ray diffraction and scanning electron microscopy, its static magnetic properties was studied by a Vibrating sample magnetometer. Compared with BaM ferrite, the crystalline particle of BaMn0.5Co0.5Zr1.0 Fe10O19 is smaller with bigger Ms. The BaM ferrite ceramics has the best properties with presintering tempareture of 1000 oC after 8 hours of milling, Furthermore, coercivity of BaMn0.5Co0.5Zr1.0 Fe10O19 is only 63 Oe and saturation magnetization is 59 emu/g after presintering treatment at 1100 ℃. With Mn-Co-Zr substitutions, Ms did not decrease and Hc decrease rapidly. Meanwhile, Mn-Co-Zr ion doping makes grain of product refinement, activity increase.
  • Synthesis and Methanol Electrocatalytic Oxidation Performance of Pt-Ni Heterostructure Nanowires
    ;Lirong Qin ;;
    . 2014, 45(11): 25-0.
    Abstract ( ) Knowledge map Save
    Pt/Ni heterostructure nanowires were fabricated by electrochemical deposition method with the help of anodic aluminum oxide (AAO) template. The morphology and structure of the nanowires were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Then, the composite of Pt/Ni nanowires and nafion were employed to modify a GC electrode. The activity and stability of this electrode to the methanol oxidation were evaluated by cyclic voltammetry and chronoamperograms methods. The results indicated that Pt/Ni heterostructure nanowires were a promising new class of catalyst for methanol oxidation and for direct methanol fuel cell applications.
    • 工艺 技术
  • Study on Torsional Fretting Wear of Ion Nitriding/Laser Hardening Duplex Modified Layers Prepared on LZ50 Steel
    ;Zhen-bing CAI ;;Min-Hao ZHU
    . 2014, 45(11): 26-0.
    Abstract ( ) Knowledge map Save
    An ion nitriding/laser hardening duplex modified treatment has been prepared on LZ50 steel surface. Base on the characterizations of the duplex modified layers, the torsional fretting wear tests of the the duplex modified layers and LZ50 steel were comparatively carried out in dry condition under different torsional angular displacement amplitudes. The results indicated that some evenly distributed acicular martensites were formed in the surface layer of LZ50 steel after the duplex modification processes. The fretting regimes of the duplex layers have been changed, i.e. the range of the mixed fretting regime was diminished, and the slip regime shifted to the direction of smaller angular displacement amplitude. The friction torques and the friction dissipated energy of the duplex modified layers were lower than that of the substrate in the all running regimes. To compare with the substrate, the wear of material reduced greatly for the duplex modified layers. The damage in the partial slip regime was slight, but in the mixed and slip regimes the damage mechanisms of the duplex modified layers were mainly delamination, abrasive wear and oxidative wear. In sum, the ion nitriding/laser hardening duplex modified layers presented well characteristics of anti-wear and anti-friction.
  • Study on Reinforced Cellulose Hollow Fiber Membranes
    Zu-wei FAN;;;
    . 2014, 45(11): 27-0.
    Abstract ( ) Knowledge map Save
    Reinforced cellulose hollow fiber membranes (RC membranes) which contained hollow tubular braids reinforcement and cellulose separation surface were prepared by the co-extrusion spinning technique. The hollow tubular braids were prepared by the two-dimensional braided technique using diacetate filaments. The separation surface was obtained from 4 wt% cellulose dope with NMMO/DMSO mixture as the solvent and water-soluble polymer as the pore-forming agent. The results showed that the viscosity of the dope was decreased with the addition of DMSO and the membrane pure water flux increased. With the increase of the coagulant temperature, the sponge-like pore structure in the separation surface became more loose and the membrane pure water flux increased, and the addition of DMSO into coagulation bath had a lesser impact on the membrane permeability. From the view of improving the membrane permeability, the addition of polyethylene glycol was superior to polyvinyl pyrrolidone. The mechanical property of RC membranes depended largely on the reinforcement. In order to keep well interfacial bonding state between the reinforcement and the separation surface, the membranes should be saved in wet condition.
  • Structure and performance study of PZT coating prepared by supersonic plasma spraying
    Hai-Dou WANG ;;
    . 2014, 45(11): 28-0.
    Abstract ( ) Knowledge map Save
    Lead-zirconate-titanate (PZT) is important functional materials which are widely used due to their perfect piezoelectric properties. In this paper, coatings were prepared by supersonic plasma spraying, the microstructure morphology and phase composition of PZT powder and coating were analyzed by SEM, XRD and TEM, as well as making the experiment of the bonding strength, micro hardness and dielectric property on the coating. The results indicated that the coating have a denser structure and low porosity, the surface of the PZT coating was smooth, characteristics of porosity is 1.6%, the average micro hardness reached 568.9HV The dielectric constant of the coating made by the supersonic plasma spraying is about 370℃.
  • Hydrogenation and Dehydrogenation Kinetics of Sponge Titanium Produced in Panzhihua
    Song CHEN;Y.G. Chen
    . 2014, 45(11): 29-0.
    Abstract ( ) Knowledge map Save
    The hydrogenation and dehydrogenation kinetics of commercial grade sponge titanium produced in Panzhihua has been studied over the temperature range from 400℃ to 600℃ using a Pressure-Composition-Temperature (PCT) system. The reaction rate constants of the hydrogenation and dehydrogenation processes are determined using the method of reaction rate analysis in a constant volume system. The apparent activation energy values obtained from the Arrhenius equation are 34.42±0.02 kJ/mol and 29.93±0.01 kJ/mol for hydrogenation and dehydrogenation, respectively. These results suggest that the hydrogenation and dehydrogenation processes are dictated by the diffusivity of hydrogen.
  • Studies on preparation and properties of PP/No-halogen free flame retardant/AT composite materials
    ;;;zhao yi pingJinling LI;
    . 2014, 45(11): 30-0.
    Abstract ( ) Knowledge map Save
    In this work, the PP/APP/MA/AT composite materials were prepared by means of melt blending with polypropylene as resin matrix, ammonium polyphosphate and melamine as flame retardants and attaoulgite as synergistic flame retardant. The processing technology of composite materials was explored, the composite materials were characterized by SEM and TG, and the mechanical properties and flame retardant properties were studied. The results showed that flame retardants and AT could be uniformly dispersed in the PP, compared with PP, the process conditions were changed to some extent, but the mechanical properties of the materials were not changed significantly. The thermal and flame retardant properties were improved significantly. On the condition of the most preferred formula and process, the limiting oxygen index (LOI) of the material increased by 40% and could be increased to 27.3.
  • Preparation of pitch-based carbon materials by template and its adsorption for phenol
    Cun Gui ZHONG
    . 2014, 45(11): 31-0.
    Abstract ( ) Knowledge map Save
    In order to obtain a high absorptive pitch-based carbon material, the combination of template and chemical activation has been used to prepare functional absorptive carbon material. The nano calcium carbonate was chosen as a template and potassium hydroxide as an activation agent. With phenol as a adsorbate to estimate the adsorptivity of the carbon material. The results showed that the adsorption capacity of the carbon material is affected by the proportion of template to coal tar pitch. It reaches 2.49 mmol?g-1 when the mass ratio of calcium carbonate to pitch was 1:2. At the same condition, the adsorption capacity of the carbon material prepared by pitch alone is only 1.9 mmol?g-1. It increases by 31% comparing with usage of the template. Further analysis shows that the adsorption process accords with the Freundlich equation. And its adsorption heat is between 35.9-50.8kJ?mol-1, which indicates that it belongs to the typical physical absorption. The research provides a new choice for utilizing coal tar pitch.
  • Fabrication of PMMA membrane with single-layer nano-pillars array based on porous anodic alumina
    Hao LIU ;Jin LI;;
    . 2014, 45(11): 32-0.
    Abstract ( ) Knowledge map Save
    Single layer Polymethylmethacrylate (PMMA) membranes with nano-pillars array were fabricated by dripping different concentration PMMA/DiMethyl Formamide (DMF) solutions on single layer porous anodic alumina (PAA) membranes in spin coating method. Experimental results showed there were ordered pores with about 300nm diameter on surface of PAA membranes, adhesion phenomenon between nano-pillars was very severe when concentration of PMMA/DMF were 10wt% and 20wt%, however, PMMA membrane with regular nano-pillars array could be acquired by using 15wt% PMMA/DMF solution. Above method for fabricating PMMA membranes with nano-pillars array can provide a help for developing mimetic gecko-food and big surface area nano-materials.
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