Materials Literature
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Dynamic thermal simulation technology was introduced to a high-temperature compression deformation test to investigate rheological behavior of 5083 aluminum alloy at elevated temperature and establish a high temperature flow stress model. Results show that flow stress is apparently influenced by both strain rate and d…
Electrocatalysts of pristine carbon nanotubes( CNTs),activated CNTs from the mixed acid oxidation and nitrogen-doped carbon layer coated CNTs( NCNTs) from modification of polyaniline( PANI),loading with platinum,were prepared by using chemical reduction of immersion. The electrocatalytical performance of these platinu…
The tensile creep tests were conducted on Al2O3-SiO2(sf)/AZ91D composite and an unreinforced AZ91D matrix alloys in the temperature range of 473.573 K and stress range of 30.100 MPa.By scanning electron microscopy and transmission electron microscopy,the microstructural effects on the creep behavior of the two materia…
Effects of subcritical quenching on the microstructure and the mechanical properties of S135 drill pipe steel were studied by means of optical microscopy(OM),scanning electron microscopy(SEM) and mechanical property testing.The results show that the ferrite-martensite dual phase microstructure of S135 drill pipe steel…
A series of corundum based microporous refractories were prepared via casting process with tabular alumina aggregates(0.088-1.000 mm) and fine powders(0.045-0.088 mm and 0.045 mm,respectively),reactive α-Al2O3 micro-sized powder(d50 = 1.75 μm) and ρ-Al2O3 micro-sized powder(d50 = 1.5 μm) as starting materials.The infl…
SiC woodceramics were prepared by a sintering process with the carbonaceous performs,which were prepared by slip casting and dry pressing with carbon powder from hemp straw as a starting material.The effects of type and content of the suspension stabilizers on the rheological property of carbonaceous slip in the proce…
Thermal protective performance is an important function of personal protective clothing.As the worldwide accepted special instrument to quantitatively evaluate the flame retardant property of protective equipments,flame manikin plays an important role in clothing thermal protection research.By reviewing the research a…
According to the theory of electromagnetic shielding,principle of shielding effectiveness for textile containing metal fibers was briefly introduced.Based on this theory,a three-dimensional simulation model was established using the multi-physics coupled software COMSOL.Simulation test of several 304 austenitic stainl…
In order to use transgenic silkworm(Bombyx mori) line with green fluorescent protein gene for production,we used traditional breeding methods to separate and purify the transgenic silkworm line and employed crossbreeding to improve its comprehensive economic traits.After green cocoon trait of a transgenic silkworm lin…
This paper tests the visual hotspot of human eyeballs for knitted apparel using eye tracker in allusion to problems of emphasizing production while neglecting innovation and emphasizing practicability while neglecting design in the design of knitted garment in the current stage in China,and finds that 78.6%people unde…
Cu-Cr-Zr series copper alloys are usually used as lead frame materials for integrated circuit(IC) with high strength and high electrical conductivity.The flow stress change rules and deformation behavior of the Cu-Cr-Zr-Ce alloy during hot compression deformation were investigated with isothermal compression test meth…
CeO2 and Ag nanoparticles and Ag-CeO2 nanocomposites were systematically prepared.The structures of the catalysts and the catalytic activity for CO oxidation were studied.The results indicate that the catalytic activity of Ag is rather poor.The highest conversion of CO oxidation was only 40%,and smaller particles led…
Adopting directional warhead is one of main ways to improve the operational effectiveness.For the high power,designing the main parameters of the gimbaled warhead killing device is necessary.The static initial velocity and static spray angle of fragments are confirmed according to the operation requirement of anti-air…
The Cu nano-particles were prepared by direct current arc plasma evaporation method.The crystal structure,chemical composition,particle morphology and particle size distribution were characterized by X-ray diffraction(XRD),X-ray fluorescence analysis(XRF),transmission electron microscopy(TEM),selected area electron di…
The all-nitrogen compounds are the promising candidates as energetic materials for high performance solid propellants. The high energies of these compounds are attributed to the large differences in bond energy between N––N single bond,N==N double bond and N≡≡N triple bond in nitrogen molecule. Although both all-nitro…
This research designs and weaves four double jacquard stitches with different stitches by using the same yarn and computerized flat knitting machine with double computer jacquard fabric as the research object;and studies structural characteristics and performances of different jacquard stitches through surface effect…
Because the limiting magnetic hysteresis loop(LMHP)of iron core is a basic parameter for power current transformer(CT)simulation,and the size of power CT is usually large,the high-voltage condition is unavoidable for measuring LMHP of power CT straightly,this paper studies a low-voltage LMHP measuring system for the p…
Application value of the Gaussian beam with flat-top shaping and some main shaping methods were introduced.Because of the advantages of aspherics,aspherics shaping method was studied,Fermi Dirac function was chosen as a flat-top beam distribution model,and the relationship between its flat-top distribution and the cha…
The surface of high sluice valves were strengthened by HVOF with WC-10Co-4Cr coat. The results shows that the bond-strengthen was 72.63Mpa, and the bond-strengthen between coat and base was in a high level; The average Vickers hardness value (HV0.3) was 1257.1. The micro-hardness was well-distributed, and the coat den…
In order to study the effect of delamination on composite in the process of production and application,the static compressive strength study of composite lamination layered defect was conducted.The compressive strength effect of two different positions delamination in the lamination direction on the composite laminate…