Materials Literature
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The microstructure,composition and mechanical properties of tree jade were investigated by scanning electron microscope,X-ray fluorescence spectrometer,X-ray diffractometer and electronic universal testing machines.The results show that the tree jade consists of silicon and oxygen,and a small amount of coloring ion ma…
With micron-grade Ti,Al,graphite,and TiC powders as the raw materials,dense layered Ti3AlC2 ceramic material was prepared by in-situ solid-liquid phase reaction by the hot-pressing sintering method.XRD and SEM were used to analyze the pattern of products and phase composition,and their mechanical property was tested.T…
AZ31 magnesium alloy was hot extruded at different extrusion temperatures and extrusion rates,and the microstructures and mechanical properties of the tested alloy samples before and after hot extrusion were investigated.The results show that dynamic recrystallization occurs during hot extrusion,therefore,compared to…
(Cr,Ti) N composite films with different Ti contents are deposited with multi-arc ion plating by changing the current of Ti target.The influences of Ti content on the deposition velocity,phase structure,surface morphology and hardness of the composite films are investigated.The strengthening mechanism of the film is d…
Electric Arc Furnac(EAF) used in metallurgy industry often causes unbalanced three-phase load power,and therefore generates severs flicker to the grid,which seriously impact the power quality.Due to the fast response feature,STATCOM is becoming the major choice for EAF compensation.The hysteresis current control strat…
Experiment for successive cold extrusion of armature part has been done.Failure of die is analysed,and process improvement is suggested.It can provide reference for process design and experiment of successive cold extrusion for thin and asymmetric shaped workpiece.
BaTiO3 (BT) Thin Film were prepared by lacquering spray pyrolysis using tetrabutyl titanate ,acetic acid and barium acetate as raw materials.Conditions of preparation equipment: The distance of nozzle is 2-3 cm,Rotational speed is 4000r.The drying temperature was 100℃and the heat-treatment technology fixed was 700℃ ac…
Microstructure and carbides of 610MPa HSLA Steel Plate for 150000 m3 Oil Storage Tank Construction was studied under various finishing rolling temperature and heat-treatment.It has found that lathing bainite can be obtained when finishing rolling temperature is controlled at 860℃ under a cooling rate of 20℃/s and the…
ZnO/Eu3+ red-emitting material with a long afterglow was prepared by using high-temperature solid phase method.The effects of calcination temperature,mass fraction of Eu3+,mass fraction of Li+,and calcination time on the illumination performance of the pro-duct were investigated based on orthogonal test method(three l…
Microstructure and properties of twin-roll strip casting high manganese TRIP(15Mn-3Si-3Al mass%)steel after cold rolling and annealing treatment were investigated.Result reveals that its elongation can be reached 21.5%(91.5%δof traditional technology),and the tensile strength can be reached 875MPa (89.3%σ_b of traditi…
The effects of aluminum on the formation of TiC were studied through DTA and XRD techniques.A series of sintering experiments using Al-Ti-C powder were conducted at different temperature.The results show that the sintered preforms present typical SHS features.Ti is difficult to react directly with C without adding Al.…
In order to further prepare the phenolic foam plastic with good properties,synthetic conditions of resole phenol-formaldehyde resin were studied in this paper. A resole phenol-formaldehyde resin containing high methylol group and low free formaldehyde content was synthesized from phenol and formaldehyde using calcium…
Three kinds of energetic complexes,Co(CHZ)4(PA)2·3H2O,Cu(CHZ)4(PA)2·4H2O and Pb(CHZ)2(PA)2·4H2O(CHZ= carbodihydrazide,PA=picric acid),were synthesized with carbohydrazide,picric acid and corresponding metallic(Co,Cu,Pb) salts.The molecular formulas of these coordination compounds were derived by using elemental analys…
Using the mechanochemistry ball mill equipment of specifically designing,the ultramicro molybdenum carbide powders were prepared by high-energy ball milling of pure molybdenum powders in coal gas atmosphere at room temperature.The structure and the particle size of powders were investigated by XRD,SEM and TEM.The resu…
Based on high quality water based polyurethane resin,pigments,fillers and additives,the preparation process of the water based paste and its application in 2K waterborne PU coatings were investigated.
A series of eutectic salt Cs2SO4·V2O5 catalysts with different molar ratios of Cs2SO4 to V2O5 were prepared by a soft-chemistry method.The melting points of the prepared eutectic salts were determined by using the TG-DTA technique,and their catalytic properties for the oxidation of soot particles were investigated by…
The forging factors which affect the inner quality of the medium-shaft forgings have been analyzed in the text.The wholly upsetting of the blank has been realized in the drain cap,which improves the center-pressing effect and makes the inside quality meet the requirement.
Zirconocene dichloride(1) in yield of 43.1% with 98.3% purity was synthesized from ZrCl4 and cyclopentadiene by diethylamine in mixed solvent[V(dichloromethane) ∶V(THF)=3 ∶7] refluxing for 6 h.The structure was characterized by 1H NMR and IR.Using 1 as the catalyst,the degree of hydrogenation of butadiene-styrene copo…
The property of magnesium is very active,which leads to produce lots of inclusions and harmful gases as well as reduce the properties of the alloy.The variety and origin of the inclusions and gases are introduced.The current development of research on the purification technology in domestic and overseas such as gas pu…
The co-polymeric aluminum-ferric (CPAF) has been synthesized by means of adding slowly Al3+ ions and sodium carbonate to pre-poly ferric chloride. The spectral analysis results of IR,27Al NMR and XRD of CPAF indicate that the copolymerization of Al3+and Fe3+ took place efficiently,and the microscopic images show that…