Materials Literature
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The corrosion behavior of the Q235 carbon steel in Beijing soil environment was investigated by burying test in nature field for one year,two years and two point five years,electrochemical impedance spectroscopy(EIS) test,morphology observations,and weight-loss method.The results showed that the general corrosion occu…
The technological requirements for the steel tube for fabrication of the hydraulic cylinder casing are presented. And the causes for the poor effectiveness of the previously-employed quenching tempering treatment process for the said tube are analyzed. Based on the analysis result,a new quenching tempering process is…
To investigate the impact resistance and damage failure mechanisms of a composite aeroengine case,the subscale containment test was conducted on a high speed spin tester and numerical simulations were carried out using an explicit transient dynamic code.The impact process between the released blade and the composite c…
Energetic binder is the future direction of energetic materials,and azide binder is a typical representative of energetic binders.The new development of azide energetic binders in the last five years is reviewed in terms of thermoset binders and thermoplastic binders,and the development trend and future application of…
The solubility data of Rebaudioside A in acetone,ethanol,95% ethanol and 90% ethanol aqueous solvents were determined by using the laser detection technique in the temperature range from 273.15 K to 318.15 K,and the Apelblat equation,ideal solution equation and polynomial empirical equation were used to correlate the…
CeO2-TiO2/attapulgite(ATP)nanocomposites were prepared by the sol-gel method using ATP as support,cerium nitrate hexahydrate and tetrabutyl titanate as raw materials,glacial acetic acid as complexing agent.The microstructures of the as-prepared composites were characterized by thermogravimetric-differential scanning c…
Coarse and spherical tungsten powders were prepared by wet hydrogen reduction.Ammonium tungstate solutions with the additives of Li,Na and K alkali metal salts were used as raw materials.The effects of the type and content of the alkali metal salts as well as reduction time on the microstructure,chemical composition,p…
To explore characteristics of sap flow of Securinega suffruticosa and its response to soil moisture,sap flow velocity of S.suffruticosa was continuously measured under different soil moisture conditions in solar greenhouse via Dynamax sap flow measuring system.The results show that sap flow velocity of S.suffruticosa…
The optical properties and electricity properties of all kinds of C3N4,such asα-C3N4,β-C3N4,Cubic-C3N4,Pseudocubic-C3N4,Graphitic-C3N4,which are obtained by First-principles method. The α-C3N4,β-C3N4,Cubic-C3N4are indirect band gap semiconductors,but Pseudocubic-C3N4and Graphitic-C3N4are direct band gap semiconductors…
Objective To observe the correlationship between heavy metal content in Fenhe river and death constituent ratio of tumor.Methods Monitoring data were obtained from CDC between 2009and 2010in Fenhe river area and analyzed according to the causes of death.The concentrations of major heavy metals as cadmium,lead,copper a…
In this paper,the damage effect was considered into the impact process of lead-free solder specimens.Based on the experimental data,the modified rate-dependent Johnson-Cook model for the Sn3.0Ag0.5Cu and Sn3.5Ag lead-free solders were derived.The stress-strain curves obtained from the modified Johnson-Cook material mo…
High current DC extended arc chemical vapor deposition(HCDCA CVD) technique was used to deposit a SiC coating which was designed as an interlayer for diamond coatings on cemented carbide micro-tools.The result shows that a continuous and compact SiC nanostructured interlayer could be prepared by HCDCA CVD technique,an…
The corrosion behavior of ultra-fine grain(UFG) copper bulk prepared by equal channel angular pressing(ECAP) was investigated in comparison with that in recrystallized coarse grain(CG) copper in 0.5mol/L NaCl solution by Tafel extrapolation method,E-t curve and immersion corrosion tests.Corrosion current was estimated…
The SiC preform was prepared by compression molding.The porosity of porous SiC preform was determined by Archimedes method,mass-volume method and mercury intrusion method,the measured results were compared.The results showed that the porosity measured by Archimedes method was small because the open porosity was large,…
SiO2-Al2O3-CaO-MgO glasses were prepared by high-temperature melting and ceria doping method.The physico-chemical properties of prepared glasses were studied.The results show that minor ceria addition decreases the glass transition temperature(tg).The linear expansion coefficient of glasses firstly decreases and then…
Optimization of the preparation for tilapia fish skin collagen polypeptide chelated calcium was carried out. Alcalase, Neutrase and Orientase 20 A were utilized for preparation for collagen polypeptide, the polypeptide was then chelated with calcium. The orthogonal design with 4 factors including temperature, time, pH…
In this study,high-temperature degumming process of pueraria lobata fiber was studied,and influences of degumming parameters,such as NaOH solution concentration,temperature,time,on the properties of fineness,breaking strength,breaking elongation and dyeing rate were discussed,the optimum degumming process was thus det…
The growth defect in KDP crystal is an important cause of its cracking during wire sawing. The numerical simulate model of the KDP crystal containing defect cut by wire saw were established by finite element method. The stress distribution near the defect during the process of sawing were analyzed,and the effect of de…
The effects of sodium hydroxide concentration, extract time, temperature, and the ratio of raw materials to liquid on the extraction of cellulose from Xiaoqu liquor distiller's grain were investigated in order to realize resource utilization of the white spirit distiller's grain. The extraction conditions have been op…
Based on the original designs of the die cooling systems,an accurate thermal equilibrium analysis was carried out to predict the required cycles to die equilibrium and the equilibrium temperature at die surfaces and inside the dies for Besturn B50 clutch shell casting.The final optimized scheme of the cooling systems…