Materials Literature
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Fe3Al intermetallic compound was obtained via vacuum annealing of supersaturated solid solution of Fe(Al),which was prepared by mechanical alloying method in air conditions using Fe and Al with different ratios as source materials and stainless steel balls as grind medium.XRD and DSC analysls show that the amount of A…
The effects of solidification in water glass sand and stainless steel mold on microstructure,mechanical properties and impact fracture of Fe-28Al-5Cr-0.06B alloy were studied. The results show that the microstructure of Fe-28Al-5Cr-0.06B alloy refines by using stainless steel mold cooling method,the tensile strength o…
In order to meet the requirement for high reliability and long service life of space movement mechanisms,hexameth-yldisilazane modified SiO2 was incorporated into MoS2-doped phe-nolic-epoxy resin-based bonded solid lubricating coatings to pre-pare multi-component composite coatings.The resulting compos-ite coatings we…
The foam stability is very important in the successive operation of foam fluids in drilling,and the drainage is the macroscopical representation of foam stability.The drainage behavior and liquid films of foam were studied by using the mesoscale molecule simulation.According to the structures of foam solution,the link…
In this study,effects of aromatic amino acids and vitamins on the growth of transketolase-deficient Bacillus subtilis and D-ribose biosynthesis were studied in chemically defined media.It was found that aromatic amino acids,biotin,pyridoxine and nicotinic acid promoted cell growth,and nicotinic acid enhanced D-ribose…
The paper introduced revise process, thinking, and bases for the YS/T492-2005 standard, and also introduced major technique target origin and formulation situation of the standard with emphasis. It has a guiding function in implementation of the standard.
The microstructure and property of Si-modified high aluminum Zn-based alloys was studied. The results show that there are not only eutectoid (Si+α) but also primary Si phases in the alloys. The polygonal Si phases decrease the mechanical properties of the alloys because combination of the primary Si phases and the mat…
Compared with the draft form based on the common double apron,applying spinning press bar spacer in the drafting zone on the spinning frame can greatly improve the yarn evenness.However,the difference among bobbins and the slub of the spun yarns must be solved by certain techniques.In addition,cleaning work may become…
The kinetic DSC curves at different temperature rising rates of two kinds of FBE powders used for pipeline coating were studied by means of DSC technology. The curing process parameters such as gel tem- perature, curing temperature and post-treatment temperature were acquired by using T-β coating graph ex- trapolation…
To explore the effect of manganese on organ coeffecient and ATPase activity of testis in chicken and study toxicity mechanism of manganese on growth of testis,500,800,1 700 mg/kg MnCl2 were added to the diet to establish the model of the sub-chronic manganese poisoning. After 30,60,90 d,testis were taken out to calcul…
To study the effects of Si3N4 powder on the phase composition,microstructure,optical property and mechanical property,two-step hot pressing method was used,and Si3N4 powders individually produced by UBE and Starck companies were selected as raw materials to prepare α-sialon ceramics with composition of Y0.4Si9.8Al2.2O…
An improved reaction kinetic model was developed by adding the elementary reactions of catalytic promoter in the three-way catalytic converter based upon the Langmuir-Hinshelwood mechanism and a detailed surface reaction mechanism.A computational gas phase kinetics software is used to simulate the reacting flow and th…
Carburized 18Cr2Ni4WA steel samples are treated by shot peening techniques.Then effect of shot peening treatment on the properties(such as microhardness,residual stress,roughness,contact fatigue life) of carburized 18Cr2Ni4WA steel are investigated by Nano Test 600,2903X-ray stress apparatus,TR200 surface roughness in…
In this article,the writer reviews the production status,process technology,consumption,market etc.of NBR;makes an all-round analysis on the application and development of NBR.The paper gives emphasis on developing high-performance functional product of NBR.
Feasibility of hole-drilling method for the measurement of residual stresses in short carbon fiber enhanced silicon carbide(C/SiC) composites was studied.Based on the disadvantage of conventional hole-drilling method and good electric conductance of high-hardness C/SiC composite,electric sparkle method(ESM),an alterna…
Using acrylonitrile-butadiene-styrene copolymer(ABS) and glass fiber(GF) as raw materials,epoxy resin as the surface compatibilizer,the effect of compatibilizer on the mechanical properties and interfacial adhesion of the composites reinforced by glass fiber was studied.The results showed that by adding epoxy resin,th…
The compounds of ZnXO(X=Li,Na and K) were prepared by a convention solid reaction method and the highly c-axis oriented ZnXO(X=Li,Na and K) thin films were deposited on Si(111) substrates by magnetron sputtering method.The structures,surface morphology and the luminescent properties of thin films were measured by X-ra…
The etch pit method and EBSD orientation of micro-analysis method were adopted to study the texture evolution of high purity aluminum foil during the preparation, which is applicable in the high-voltage anode of electrolytic capacitor. The results show that the main types of high purity aluminum hot rolling texture ar…
Polyepichlorohydrin(PECH) was synthesized by the opening-ring polymerization of epichlorohydrin using 1,4-butanediol as initiator,boron-trifluoride etherate as catalyst.Hydroxyl-terminated glycidyl azide polymer(GAP) was synthesized by azidation of PECH,and then acetate-terminated glycidyl azide polymer(ETGAP) was obt…
In recent years,the gelled-electrolyte lead-acid batteries have been developed into a reliable and versatile energy-storage device.In this review,the development of gelled-electrolyte for lead-acid battery was described,including gelatinizing agent,sulfuric acid and additives.