Materials Literature
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The micro-structure and mechanical properties of 27SiMn steel was investigated by tensile test,hardness test,impact toughness,metallographic structure,XRD and SEM for quenching in 770-830 ℃,isothermal holding temperature in 360-420 ℃and isothermal holding time in 10-90 min.The results show that 27SiMn can obtain of th…
A flexible curing agent containing a long methylene chain segment was synthesized by a modification of hexamethylenediamine with bis-functional epoxy resin,and its structure was characterized by infrared spectroscopy,and through the on-line infrared detection at 60℃ and the analysis of effect of curing time at various…
The xBi(Mg0.5Ti0.5)O3-0.95K0.5Na0.5NbO3-0.05LiSbO3(xBMT-KNN-LS) lead-free piezoceramics were prepared by traditional solid-state reaction sintering process and second sintering process.The influence of second sintering process on the performance of xBMT-KNN-LS piezoceramics was investigated.The results showed that the…
A dynamical failure assessment of explosion containment vessel(ECV) using FAD method is conducted.The numerical analysis of a cylindrical vessel with through crack subjected to impulsive loading was performed.Using virtual crack closure technology,the dynamical stress intensity factors were obtained.The result indicat…
Ru-based catalysts have many unique properties, especially under mild conditions such as law temperature and pressure. The re-cent developments of preparation methods and application of nanometer materials supported ruthenium catalysts were reviewed. The effects of support materials, precursors, and ruthenium nanomete…
Composition and microstructure design of braking composites have important effects on their properties and service time.Based on the property need of C fiber reinforced braking composites,a detailed description on the present application aspects of matrix modification and introducing ways of the fillers is given.The p…
Magnesium alloy is potentially a desirable metallic material for degradable orthopedic implants if its corrosion rate can be reduced by surface modification.To achieve this aim,a protective and biocompatible coating was directly prepared on AZ91D magnesium alloy surface by the low-cost and simple one-step hydrothermal…
Transient photovoltaic technology(TRP) and surface photovoltaic spectrum(SPS) were used for studying the photogenerated charge of nano-ZnO.The results show that when the time domain of TRP range of 10-9—10-7 and 10-6—10-3 s,the photovoltage response of SPS appears in range of 320—380 nm.But when time domain is range o…
The electromagnetic environment of substation is complicated,a great variety of ultra high-frequency(UHF) interference signals caused by communication and pulse interference signals outside power equipments cause difficulties to accurately diagnose the test results of on-site detection of the faults caused by partial…
By plasma spray welding technology with the appropriate processing parameter,a wear-resistant coating was prepared on HT250 Cast iron with Stellite6 cobalt-based alloy powder.The microstructure of the spray coating was investigated by OM、SEM and XRD.The microhardness of the coating was tested by microhardness tester.T…
The air flow distribution can be analyzed vividly and visual by using numerical simulation technique to conduct the analogue simulation of the convergence area.Thus,Fluent numerical simulation method is used to simulate the variation of air flow distribution of the convergence area of the four-roller compact spinning…
A series of organotin 1-phenyl-3,5-dimethylpyrazole-4-carboxylates and 1-(2-pyridyl)-3,5-dimethyl-pyrazole-4-carboxylates(1 ～14) have been obtained and characterized by IR,NMR(1H,13C and 119Sn) and elemental analysis.The structure of triethyltin 1-phenyl-3,5-dimethylpyrazole-4-carboxylate 7 has been further confirmed…
By the self-developed coefficient of thermal conductivity test devices and test method,the experimental relationship between the thickness of wadding used in cold protective clothing and its thermal conductivity was acquired.According to the distribution laws of a multi-layers clothing ensemble,the relationship betwee…
Bi0.95Eu0.05Fe0.95Co0.05O3 nanoparticles sample was prepared by sol-gel process.The microstructure and morphology of samples were analyzed by X-ray diffraction(XRD) and scanning electron microscopy(SEM),the result indicated that it was the single phase rhombohedral perovskite structure.The X-ray absorption spectroscop…
A series of Fe-Cr-Ti-C hardfacing alloys with different Cr contents were prepared by PTA in order to develop a Fe-based wear resistant composite material.The microstructure and carbides morphology were investigated by means of scanning electron microscopy(SEM) and X-ray diffraction(XRD).The results show that the matri…
Pseudo-boehmite was prepared from Al2(SO4)3 and NaAlO2,then γ-Al2O3 was gained via the calcination.Effects of reaction temperature,pH,reactants concentration and addition of PEG on properties of γ-Al2O were studied.XRD,BET and mercury porosimeter were used in characterization of γ-Al2O3.At last,mesoporous-macroporous…
The value of steam-heat recycling in steam-jet type vacuum pre-conditioner was analyzed,and it's difficulties were briefly discussed.The structure and working principle of the equipment for vacuum pumping steam-heat recycling were introduced.After application of the system,about 250,000 m3 natural gas can be reduced p…
The electronic property,structure and crystallization of V2O5–P2O5–Sb2O3–Bi2O3 glass system were investigated via vol-ume resistivity,infrared spectroscopy and X-ray diffraction,respectively.The result shows that Sb2O3 partially substitutes V2O5,leading to the increase of the volume resistivity of glasses.The characte…
With better functional properties and broad spectrum,high efficient antimicrobial activity,chitosan is considered as an ideal material of natural antimicrobial agents.The antibacterial mechanism of chitosan for bacterium and fungus,and its chemical modification in increasing solubility and antibacterial activity were…
Based on the density functional theory(DFT) of first-principles,the characters of perovskite-type oxides BaFeO3,BaCoO3 and BaNbO3,such as crystal lattices,electronic structures and the formation energies of oxygen vacancies,were investigated with theoretical chemistry calculations.The equilibrium lattice constants of…