Materials Literature
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Based on the stress distribution in the bonded and de-bonded region of ceramic matrix composite(CMC) with matrix cracks,the sliding mechanism of CMC was investigated,and the analytical method for estimating damping capacity in unidirectional CMC was derived.Numerical examples show that:(1) CMCs' inherent damping capac…
In order to improve corrosion resistance of AZ31 magnesium alloy for biomedical application,a composite coating was prepared on AZ31 with the combination of applications of anodic oxidation and chemical conversion technology.The morphology of the coating was observed by SEM and its phases was analyzed by XRD while its…
Taking X20CrMoV12.1 heat-resistant steel pipes as the object of study, microstructure changes of the material,especially evolution of the carbide morphology and composition,were studied,while causes leading to variation of material properties analyzed.Results show that after 180 000 h long-term service at 550 ℃,the ma…
The steady rheological behaviors of collagen solution were studied by coaxial viscometer.The effects of concentration and temperature on the flow curve of collagen solution were discussed.The experimental data showed that viscosity decreased with increasing shear rate,indicating that collagen solution was pseudo-plast…
The effects of carburizing temperature,carbon potential in strong carburisng period and diffusion carburisng period on microstructure and properties of carburized layer of new-type 16Cr3NiWMoVNbE gear steel were studied.The results show that carburizing layer's depth and carbon concentration increases with the increas…
During outdoor applications,ethylene-propylene-diene monomer(EPDM) rubber can be degraded under the effect of light,oxygen,heat and chemical medium, which can deteriorate the bulk properties and reduce its service life.The research on EPDM aging was reviewed in this paper and the trend of development in EPDM aging stu…
Relatively uniform-sized poly(lactic acid) (PLA) microspheres with the average particle size of 800 nm were successfully prepared by premix membrane emulsification combined with solvent evaporation method. The effects of pH value, salt concentration, amount of PLA microspheres, HBsAg concentration and adsorption tempe…
The sources in building fire are mainly solid combustibles. Based on the pyrolysis kinetics model of solid combustibles, a large eddy simulation (LES) is applied to the study of the interactions between the pyrolysis of the polyurethane foam (PUF) slab and the space fire spread and smoke flow in a multi-room building.…
This paper describes the current situation of waste recycling steel,analysis the characteristics and main source of the dust from steel-smelting,provided the route of how to obtain zinc dust from steelmaking for recovering zinc.
Ni coatings with different grain sizes,preferred orientation and impurity element contents can be electrodeposited by regulating cathode current density. Using transmission electron microscopy(TEM),scanning electron microscopy (SEM),energy dispersive spectroscopy (EDS) and X-ray diffractometry(XRD),the oxide film stru…
Based on Lee-Tarver ignition and growth model,the models that tungsten spheres with an outer diameters of 9,14,18,and 25mm respectively impacted tantalum covered Composition B charges were simulated,and the critical velocity to ignite Composition B were gained,which accorded with the experimental results well,and then…
The criterion for persistent fission chain determination was discussed and the analog Monte-Carlo code for calculating initiation probability of persistent fission chain based on Geant4 toolkit was developed.Initiation probabilities for a suit of test problems and GodivaⅠ reactor whose reactivity is 5 c/above prompt c…
The nano-sized β-Ni(OH)2 powder with nano-flakes and nanorod were prepared by chemical precipitation method.The nano-sized powder was added into micron-scale spheroshape Ni(OH)2 at a ratio of 8% to get a composite electrode.Effects of reaction temperature and stirring speed on the morphology and structure of the powde…
Hydrogen was charged into X70 and X80 pipeline steels in 0.5 mol/L H2SO4 solution by cathodic polarization method and the behavior of hydrogen in both steels was studied by glycerol displacement method.The results showed that a stable hydrogen concentration was obtained in the steels as the charging time was longer th…
Based on experimental results of typical architectural glass,impact properties of glass were studied by using a split Hopkinson pressure bar(SHPB)technique.Experimental results show that impact properties of tempered glass,such as stress,strain rate and properties of impact resistance et al,are better than that of flo…
The tensile properties at room temperature and at 650℃of TMW-1 titanium alloy and TMW-2 titanium alloy,with different content ofβ—stabilizers(Mo,W),under different dual and ternary annealing,were studied.The results show that the tensile properties of TMW-1/2 titanium alloys at 650℃were equivalent to those of several…
The microstructure and properties of SPHC hot-rolled strip were investigated by using tensile,metallographic,scanning electron microscope(SEM),energy dispersion spectrum(EDS) and quantitative analysis of precipitates.The results show that: the maximum difference of yield strength on the direction of length is about 40…
Electrochemical behaviors of aluminum in 4 mol/L KOH solution with inhibitors were investigated by hydrogen collection and polarization curve measurement.It was found that aluminum exhibited minimum corrosion rate in a 4 mol/L KOH solution containing 0.02 mol/L EDTA,saturated Ca(OH)2 and saturated Sr(OH)2.It was also…
The distributing rules of adsorbed ions in exchange column and the influencing factors during dynamic ion exchange are acquired through theoretical analysis.On the above basis,a novel idea of variable-parameter ion exchange and its principles are presented.The application of the variable-parameter ion exchange process…
Effects of the oxidant(HMX or CL-20) on the combustion performances of Al/H2O based fuels were studied by a series of experimental techniques in air atmosphere.The experimental results show that,compared with CL-20 addition,HMX makes Al powders burn much thoroughly,and it has better effect in increasing the temperatur…