Materials Literature
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Experimental sintering studies on SiC-Al2O3 powder were taken with fast heating rate(200 ℃/min)by SPS sintering technique.Two kinds of a-Al2O3 powders(200 and 600 nm)were used as the raw materials.The effects of sintering temperature and powder size on the density and grain growth were studied.The microstructural chan…
Calcium sulphoaluminate(3CaO·3Al2O3·CaSO4,C4A3)was prepared with chemical reagents CaCO3,Al2O3,CaSO4·2H2O.The formation dynamics of C4A3 was investigated by X-ray diffraction and scanning electron microscope-energy disperse spectroscopy.The results show that the formation reaction of C4A3 belongs to the chemical re…
Effect of solution temperature on microstructure and mechanical properties of a novel Al-Cu-Li alloy(2A97 alloy) solution-treated at 460-540℃ was studied by means of optical microscope,TEM,SEM and EDS analysis.After solution treatment,the all alloy samples were aged at 165℃ for 48 h.The results show that complete diss…
The generalized eigenvalue method was used to solve the turn-based equivalent circuit model of the winding to satisfy the requirements of fast transient simulation of power transformer windings.Under the assumption that the losses can be ignored or the conductance can be merged into capacitance by a factor,the equatio…
By using the particle discrete element method,a three-phase (aggregate,mortar and interface) meso-scaled concrete model is developed for investigating dynamic behaviour of concrete materials with an efficient pre-processing approach. Based on the presented model,the dynamic splitting tensile tests of concrete with dif…
The phenomenon that MnS inclusion precipitates on surface of Ti-Al de-oxidation complex inclusion was studied systematically in lab by utilizing resistance furnace.The effect of Ti-Al complex inclusions on MnS precipitation amount and morphology was investigated by varying the cooling rate and the content of S in stee…
beta-Al2O3 precursor powders were synthesized by the EDTA complexing sol-gel method at lower temperatures using metal nitrate and EDTA as raw materials.The thermal decomposition mechanism of the gel and the formation process of beta-Al2O3 were investigated by XRD,FTIR,TG/DSC,EIS and SEM.The results showed that beta-Al…
Adopting commercial FEM soft Deform-3D and welding mesh reconstruction method,the influences of welding chamber depth and welding angle on forming quality of diplopore extrusion of square tube by a porthole die were analyzed.The results show that,the hydrostatic stress of welding plane,equivalent stress on the bottom…
Five quaternary ammonium salts were intercalated into montmorillonite(MMT) and the structures of organo-montmorillonite (O-MMT) were characterized. And then the performance of O-MMT was studied for the removal of Chinese typical HABs alga Chattonella marina. The results of FTIR,XRD and TGA show that the five ammonium…
The corrosive environment and the characteristics of durability damage for marine concrete structures are summarized The development process of durability technology from 1980's,the research on the durability technology and its application for marine concrete in China are described.Also,the durability technology for m…
Effect of desensitization time on phase precipitation,evolution of chromium-depleted zone and intergranular corrosion tendency of Inconel 690 alloy was studied in this paper through TEM,phase analysis and EPR methods.With increase of desensitization time at 700℃,the results can be obtained as follows: the precipitated…
Accurate data of the internal residual stress can not be obtained in the process of compression molding of aspherical glass lenses, so finite element method was presented to analyze inner stresshistory and predict residual stress distribution. According to the nature of glass at high temperatures which is similar to v…
The research status of the freckles,a kind of common defects in directionally solidified and single crystal nickel-based superalloys,is reviewed in this paper.The formation mechanisms of freckle defects and the models that are applied to predict the formation of freckles are presented.The influences of alloy compositi…
Continuous basalt fibers have good physical and chemical performance.Various types of CBF yarn,CBF cloth,CBF mat,and other CBF products are systematically reviewed in this paper.And the foreground of the products is prospected.
Functionalization of graphene oxide is important for technological applications since it allows integrating into different environments such as biological fluids,polymer matrices,silicon surface and others.Graphene oxide was made through the ultrasonic separation of graphite oxide,and then it was modified with functio…
In order to accurately predict the temperature field of rolled pieces,optimize the hot rolling process and improve the quality of the final product,the finite element temperature model of 3104 aluminum alloy plate during single pass hot rollig process was built up using MSC,Marc softwares by rolling test and two-dimen…
The reason of cracking on surface of 20CrMnMo carburized heavy-duty gear was analyzed by SEM and optical metalloscope.The failure mechanism was also discussed.The results show that the microstructure of the quenched steel is coarse acicular martensite,which resulted in brittle fracture of the gear with intergranular c…
The numerical simulation of temperature field and stress field during the solidification of HT250 stress frame casting was carried out by using of the professional casting simulation software—ProCAST, with three different pouring temperatures and three different shakeout temperatures, respectively. The residual stress…
High-strength and high-conductivity Cu-Ag alloys is a kind of functional materials with great physical and mechanical properties,which have high strength coupled with good conductivity.The present research on the structure,fabrication technology,strengthening and conducting mechanisms is reviewed,the development prosp…
The equilibrium solubility of the ternary system KClNH4Cl-H2O were determined at 25 ℃ and the corresponding phase diagram was constructed.The two kinds of solid solutions of mNH4Cl·KCl and NH4Cl·nKCl were prepared by a method of constant-cooling-rate and characterized by XRD,FTIR and SEM,and the corresponding cell par…