Materials Literature
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Time-to-corrosion of two commercially available corrosion inhibitors in simulated pore solutions and mortar was monitored through linear polarization resistance and half-cell potential method.Their effects on chloride threshold values and chloride penetration rate in concrete were also investigated.Results indicated t…
The effects of different cordierite contents on the properties of mullite-bauxite castable refractory were analyzed respectively by taking the mullite,bauxite as main raw materials and taking calcium aluminate cement as binding system.After 24 h curing in mould and another 24 h curing at 110 ℃ after demoulding,the spe…
Pure B_4C and B_4C-20%SiC composite ceramics were prepared by hot-pressing sintering technique after ball-mill mixing in the temperature range of 1 900—2 100℃,using B_4C powder with a particle of 10.22 μm and β-SiC powder of 1.07 μm as the starting materials.Phase structure and mechanical properties had been studied.…
The pulsed MIG welding was used to weld AZ31B Mg alloy,and the weldability of the alloy was studied.The microstructure,mechanical property and hardness of the welded joint were investigated via the metal phase microscopy,scanning electron microscope,tensile testing machine and hardness instrument.The results show that…
The 4A zeolite molecular sieve [Na12(Al12Si12O48) ·27H2O] was synthesized in a sealed Teflon lined autoclave by hydrothermal reaction of NaOH solution and metakaolinite(the mass ratio of solid/liquid is 1:20) prepared by calcined coal-measure kaolin from Xuzhou at 550℃ for 2h.4A zeolite molecular sieve was characteriz…
The production process technology and application of titanium alloys both here and abroad for late years have been summarized in this paper.Authors speculate the development trend of titanium alloys and deem that titanium alloys possess vast potential application and offer the proposal to realize the low cost producti…
The cold rolling process and microstructure development of AZ31B magnesium alloy were researched,and the influence of anneal process,including annealing temperature and time,and the reduction of cold roll was also investigated.The static recrystallization diagram of AZ31B magnesium alloy was obtained.The results show…
Medicated ultrafine fiber mats were prepared using electrospinning with polyacrylonitrile(PAN) as matrix and acyclovir as model drug.The mats were characterized by scanning electron microscope(SEM),infrared spectroscopy(IR) and in vitro dissolution tests.SEM images envisaged that the diameters of fibers increased slig…
Dietary fiber was prepared from wheat bran and the effects of ultrafine comminution and freeze-grinding on its physicochemical properties were studied. The results showed that the average particle sizes of ultrafine and freeze-ground dietary fibers were 20.861 and 13.382 μm,respectively. Ultrafine comminution and free…
The research development of shop drawing on the basis of dynamic material model (DMM) is summarized in this paper. The principles of DMM are introduced emphatically, and the advantages and disadvantages of common plastic instability criteria are analyzed comparatively. Based on 2D shop drawing, 3D shop drawing includi…
Sialon powders were prepared by carbothermal reduction and nitridation method at 1450 ℃ and 1500 ℃ using high-alumina fly ash and carbon coke as raw materials.The effects of carbon coke content,heating temperature and holding time on the phase constitution and microstructure of the products were investigated by XRD an…
The effect of ultrasound on restraining the occurrence of on the flat surface was studied.The phenomena on the flat surface with and without 20 kHz ultrasound under natural convection conditions were visually studied.The effects of different cold surface temperatures on the thickness with and without ultrasound were c…
The status quo,the formation mechanism,as well as controlling methods of NOx emissions in marine diesel engine are introduced.Based on one particular engine type,the emphasis has been put upon the latest development of in-engine cleaning technologies such as injection rates controlling,in-cylinder water adding,and cha…
Polyaniline/conducting cotton textile(PANI/CCT) was prepared by using an insitu polymerization of aniline with ammonium persulfate as oxidiant based on the white cotton textile.It was found that the chemical combination of aniline with cellulose took place during the in-situ polymerization,and the PANI nanoparticles w…
Terpolymerization of carbon dioxide(CO2) with propylene oxide(PO) and phthalic anhydride(PA) was successfully carried out using supported zinc glutarate catalyst(s-ZnGA).Consequently giving high molecular weight poly(propylene carbonate phthalate)(PPCPA) in a very high yield.The resulting terpolymers were fully charac…
The theoretic and technology achievements of caustic decomposition of tungsten concentrates,especially scheelite concentrates,since 1980 s,were reviewed.The research orientation is also put forward.
The polystyrene (PS) degradation and its catalytic degradation by adding BaO in it as catalyst (PS-BaO) were studied by thermogravimetry, and the degradation activation energies of PS and PS-BaO were obtained respectively by Vyazovkin model-free kinetic method. For the whole degradation process, the degradation activa…
The split Hopkinson pressure bar(SHPB) experimental technique is the most common method to evaluate the dynamic mechanical properties in the range of strain rates from 10~2s~(-1) to 10~4s~(-1).The state-of-the-art methods in Hopkinson bar experiments are summarized after a detailed discussion of the three classic pape…
Carbon residue has serious detriment for alunimium reduction process.According to the analysis for carbon residue sources,the main reasons of carbon residue generation are not only described into the low qualified baked anode,but also has a direct relationship between the design and process operation of pot.Therefore,…
In this paper,we describe that the relation between the highest eigencomponent and the vertex degree of graph,and we get the inequality relation between the spectral radius of graphs and the largest vertex degree and the second largest vertex degree. Moreover,we get some the upper bounds of spectral radius of simple c…