Materials Literature
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The galvanic corrosion behavior of continuous casting copper-clad steel-and electroplating copper-clad steel-bars with unclad two-end faces was investigated by galvaric corrosion test and a laboratory embedmant test in Dagang soil.Then macro-and micro-corrosion morphology was observed by optical microscopy and SEM.The…
This article employes KMV model to measure credit risk of Chinese manufacturing industry 42 listed company data,and finds the KMV model can measure credit risk of Chinese listed company.This article improves default point of KMV model by using the Chinese ST and* ST company's financial data based on the Chinese actual…
Super absorbent resins were synthesized by graft copolymerization reaction of acrylic acid(AA) and acrylic amide(AM) and acryloyl-oxyethyl trimethyl ammonium chloride(DAC) onto the pretreatment corn straw(PTCS) by radical polymerization in aqueous solution.The factors,which influenced absorbency of super absorbents,su…
It is reported that polyimide nano-composite film(100CR)has good resistance against corona,yet the mechanism of this resistance is not systematically researched.To investigate how inorganic nanoparticles addition influences the corona resistance of polymide films,we experimentally studied the mechanism of 100CR film a…
The effects of the rare earth oxide on the thermodynamics of Al-Ti-C-RE master alloy prepared by mixing the potassium titanium fluoride and carbon into aluminum melt were studied by means of SEM, EDS and DSC. The results show that the aluminothermy reaction of the Al melt and K2TiF6 occurs to produce the TiA13 and [Ti…
Measurement of potentiodynamic curve and electrochemical impedance spectra(EIS) was used to study the corrosion resistance of a medical 316L stainless steel passivated by citric acid in simulated body fluid.XPS was applied to analyze the effect of surface composition on the corrosion resistance of the studied material…
3-Aminopropyl triethoxysilane(APTES) was used as the amination agent and coated onto the surface of ferriferous oxide(Fe3O4) magnetite nanoparticles via silanization reaction.The chemical bonding feature of as-synthesized APTES-coated Fe3O4 nanoparticles was analyzed by Fourier transform infrared spectrometry,and its…
Chemical composition and phase analysis of insulator contamination in Guangzhou region transmission lines have been analyzed by X-ray diffractometer(XRD)and X-ray energy dispersion spectrometer(EDS)in this paper.The insulator contaminant powders which collected from different areas,such as chemical plant,coking plant,…
The computation of torque based on existed high accuracy analytical models of the flux-linkage of switched reluctance motor(SRM) is complicated.To solve this problem,an analytical model with trigonometric functions is presented,considering the symmetry characteristics of flux-linkage versus rotor position curves.In th…
The effect of salt concentration on pH,titratable acid,water content,sodium chloride content,alcoholinsoluble solid content,mineral content,firmness and tissue microstructure of bamboo shoots(Dendrocalamus latiflorus) was investigated during pickling.It was found that bamboo shoots pickled in high salt solution had hi…
In order to reduce the torque ripple of permanent magnet synchronous motor(PMSM),the method of modular pole is studied in this paper.The air-gap flux density and phase back EMF with modular pole were calculated with analytical method.Based on the analytical expression,the effect of pole-arc width of modular pole on th…
The controlled rolling and controlled cooling test was conducted on low-cost V-N microalloyed steel.The transformation mechanisms and precipitation behavior were discussed,and the comprehensive mechanical properties were systematically studied.The results indicated that the microstructure composes of polygonal ferrite…
The effects of lanthanum on microstructure of ADC12 aluminum alloy solid solution and aging treatment were studied by means of optical microscopy(OM),scanning electron microscope(SEM) and energy diffraction spectrum(EDS).At the same time,the effect of solid solution temperature on microstructure of ADC12 aluminum allo…
An approach to predict the elastic modulus of unidirectional C/SiC composites at 400-900 ℃ oxidation environments was developed.The approach combined the mass loss rate model with the mixed rule formulation.The elastic modulus of C/SiC composites at 400-700 ℃ and 700-900 ℃ air environment which represents two differen…
Alumina coatings were deposited on 316L stainless steel by metal organic chemical vapor deposition(MOCVD).The phase and microstructure of coatings were examined by XRD and SEM,and the hydrogen permeation behavior of coating was measured by a gas-phase hydrogen permeation apparatus.The results show that the alumina coa…
L-type molecular sieve was indirectly synthesized under proper conditions using potassium feldspar powder.Aluminosilicate with a higher chemical activity was acquired after hydrothermal and acid treatment on the powder,and then potassium silicate water glass was added in the synthesis.The influences of guiding agent,S…
Influence of heat treatment process of T4,T6 and cryogenic-thermal cycling treatment after solution treating(modified T7) on microstructure,properties and dimensional stability of a 2A12 aluminum alloy was investigated.The results show that compared with the normal heat treatments T6 and T4,the tensile strength,yield…
Sensitivities to heat,laser,impact,friction,flame and electrostatic spark for tetraamnine bis(5-nitrotetrazolato) cobalt(Ⅲ) perchlorate(BNCP) and BNCP doped with carbon nanotubes(CNTs) and carbon black(CB) were measured and studied by DSC,laser sensitivity test and standardization methods GJB5891.22,24,25,27-2006.Resu…
Induction quenching for GCr15 steel ball screw with magnetic flux leakage controlling by coating magnetizer was investigated.Microstructure,hardness,depth and wear resistance of surface induction-hardened layer were analyzed,respectively.The results indicate that the quenched layer microstructure consists of martensit…
To understand the flow stress characteristics of aluminum 7075-T651,dynamic compression tests during the temperature range of 25-400 ℃ and strain rate range of 600-12 000 s-1 were performed on cylindrical samples using SHPB technique.The results show that the flow stress of aluminum 7075-T651 is strongly sensitive to…