Materials Literature
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Introduction was made to two kinds of riveting tooling for typical parts in KFM3 case-moulded circuit breaker.Aiming at arc extinguish chamber structure features in KFM3 new product,riveting tooling with upper and lower automatic material pressing push-bar was designed.Analysis was made to the causes of workpiece turn…
In this paper,based on the cold extrusion principle in metal plastic forming of less or no chip,a simple,reasonable and feasible mold structure is designed by analyzing the cold extrusion technology for the spur cylinder gear.And then a cold extrusion experiment is carried out successfully,the results show that the ne…
The processes on treatment of nickel waste in recent years were briefly reviewed in the paper.Meanwhile,the novel methods researched with prospect application at home and abroad were also introduced.In addition,the main existing problems of nickel waste processing and the main directions in nickel waste treatment were…
The three-dimensional FEM models of discrete rod were built with ANSYS.The warhead explosively driven process was numerically simulated by LS-DYNA with Lagrange algorithm.The study shows centre point initiation make discrete rod achieve higher speed and reliability for target damage.The result of numerical simulation…
The multilayer ceramics were prepared by screen-printing method to brush Al slurry on Al2O3 slices and heat treated in oxidizing enviroment.The effects of the layers of Al2O3 slices and the heat treatment temperature on the bending strength,the fracture toughness,and the impact energy of the multilayer ceramics were i…
The adsorption and desorption performance of macroporous resin NKA-9 to the chlorogenic acid was studied.The static adsorption and desorption index of NKA-9 was 72.30% and 79.74%,respectively.The adsorption quantity reached at the maximum value when the adsorption time was 6 hours,and the desorption quantity achieved…
The nylon 636,a kind of polyamide with long carbon chain was synthesized by using dimmer acid and hex-amethylenediamine.The chemical structure of nylon 636 was characterized by FT-IR and 1H-NMR.The physical and me-chanical properties were determined.The result showed that dimmer acid nylon 636 was a good engineering p…
The recent advances in the main clean processes to synthesize diphenylmethane diisocyanates (MDI) are reviewed,such as BTC method,condensation of aniline,reductive carbonylation of nitrobenzene,oxidative carbonylation of aniline,methoxycarbonylation of aniline,alcoholysis of N,N′-diphenyl urea and the coupling process…
Layered cobalt oxide YBaCo2O5+δ for solid oxide fuel cell cathode material was studied by observing the microstructure, thermal expansion and electrical conductivity. It is found that YBaCo2O5+δ has excellent thermal expansion matching Ce0.8Gd0.2O2–δ electrolyte, as well as better structural and chemical stability at…
Being aware of the present reality of the nuclear industry and nuclear technology application in Guangxi Zhuangzu Autonomous Region,the present supervision conditions on nuclear and radiation safety are analysed.Some suggestions,such as constituting Guangxi safety management system of radioactive source,standarding th…
The binary oxalate precursor was prepared by solid-state reaction at room temperature with Zn(NO3)2·6H2O,Fe(NO3)2·9H2O,Oxalic acid and PVA as soft template.Then,the red-brown powders were characterized by SEM and XRD after calcination at 600 ℃ for 3 h.The results show that the one dimensional rod-like Zinc ferrite(ZnF…
The electronic and optical properties of Mg(Ni:MgAl2O4) are investigated by use of the density functional theory(DFT).The calculated results indicate that Mg(Ni:MgAl2O4) is a semiconductor with a small gap 2.94eV.It is concluded that the doping element Ni has specific rule in the MgAl2O4 spinel,which leads it showing…
The paper investigated the technology of polylactic acid fiber Sirospun yarns by changing the roving gauge,roving twist coefficient and back drafting multiple.It analyzed during different spinning processes,the changing patterns of the index of yarns such as breaking strength,fuzzy fiber and yarn evenness.It had also…
The adsorption kinetics of bamboo charcoal and carbon nanotubes(CNT)for bisphenol A(BPA) and 4-nitroaniline(4NN) from aqueous solution was studied.The results show that the equilibrium adsorbing capacity(qe) of BPA and 4NN increases with the increase of initial concentration or temperature.On the same condition,the or…
The preparation methods and progress in development of SBS nanocomposites were reviewed in this paper. The studies on intercalation to prepare SBS nanocomposites were introduced in detail, and the application of SBS and SBS nanocomposites were also summarized.
The composites gained from the thermoplastic elastomer of the styrene-butadiene-styrene block copolymer(SBS) by filling the polypropylene(PP) were mainly discussed.The first step was to prepare the composites of different content of the thermoplastic elastomer SBS.The next step was to test the physical and chemical pr…
Li2CO3-doped ZnO varistor ceramics were prepared using oxide solid phase synthesis method. The effects of dopant amount on the electrical properties and energy band of ZnO varistor ceramics were studied. The results show that the voltage gradient of ZnO varistor ceramics increases from 529 V/mm to 2 170 V/mm with incr…
Based on the Fresnel diffraction integral and the complex Gaussian expansion for the hard-edge aperture function,a simple and analytical expression for calculating the diffraction field distribution of an apertured lens is presented.This analytical expression can overcome the difficulty in computing the diffraction in…
The recent progress of chiral Brnsted acid catalysts derived from BINOL was generally reviewed,including the structure changing on catalysts and substrates.The factors on effect of enantiomeric excess were introduced.
The oxidation of Si3N4-SiC materials containing different Si3N4 content at different temperatures was studied.Through analysis of the oxidation weight gain after oxidation,it is found that the higher content of Si3N4 and the higher temperature,the more complete the oxidation occurs,furthermore the oxidation weight gai…