Materials Literature
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In order to probe into the approach to improve heat resistance of Mg-Al based alloys,effect of silicon on microstructure and mechanical properties of graphite mould cast Mg-9%Al-x%Si(x=3,6 and 9) alloys was examined.The microstructure of the alloys consists of α-Mg,dendrite Mg_2Si and β-Mg_(17)Al_(12) phases.The size…
The thermal spraying is a new technology of metal surface treatment and protection,by thermal spraying technology on the surface of the material processes,the performance of the surface of the material will be improved.Most root cause of failure in mechanical engineering was mainly due to the wear and tear caused.By t…
A lattice model was developed for predicting the chloride diffusivity of concrete.By applying the principle of energy equivalence,an analytical relationship of chloride diffusivity between the lattice beam and the continuum body was derived.Based on the simulated aggregate distribution and the relative positions betwe…
Giant magnetostrictive actuator are widely used in accurate control fields,the performance improvement of the servo controller can increase productivity and product quality.The development of the system modeling and control technique of giant magnetostrictive actuator is reviewed,and the basic design principles of gia…
The ZnS powder is prepared by hydrothermal method and coated with zinc carbonate hydroxide by homogeneous precipitation method.ZnO-coated ZnS particles can be obtained using calcine precursor.The powders are characterized by XRD,SEM and PL techniques.The results indicate that the coated-ZnS with different morphology c…
Glucoside quaternary(CAPG) was prepared with 3-chloro-2-hydroxypropylglucoside(CPG) and tertiary amine,using normal propyl alcohol aqueous solution as a solvent.The optimum conditions were shown as follows:n(CPG)/n(tertiary amine)=1.4,m(normal propyl alcohol)/m(water)=0.5,the reaction time 4 h.The conversion rate of t…
Dichlorophenylphosphine sulfide(3) was greenly prepared from phosphorus trichloride,benzene and sulfur powder by ionic liquid method. Two novel flame retardants containing phosphorus,2,4,8,10-tetraoxa-3,9-dithio-3,9-diphenyl-3,9-diphosphaspiro[5,5]-undecane(1) or 5,5-dimethyl-2-phenyl-2-thio-1,3,2-dioxaphosphorinane(2…
Maraging steel has ultra-high strength and fine comprehensive characteristics.However,a large number of banded structure was found in the forging process,such structure has seriously affected the properties of the material,such as anisotropy,lower plasticity,impact toughness and reduction of area.This paper focuses on…
OBJECTIVE To prepare aluminum hydroxide granules modified with stearic acid,and test the release rate in vitro.METHODS The modified aluminum hydroxide was synthesized with stearic acid and used to prepare the sustained-release preparation;The modified sample was indentified by FT-IR and determined release rate using U…
The scab of transmission gearbox shell was studied, and the possible causes of the scab in the green sand casting were analyzed. Finally the defect of scab was eliminated through controlling properties of molding sand, pouring time and coating, etc.
This article introduced a kind of squeeze roller of special manganese-titanium alloy steel used in high frequency welded pipe.The squeeze roller belongs to non-quenched casting steel with extraording anti-abrasion property and low conductivity magnetic.It can be used by unlimited reapair in case of OD permission,and m…
The preparation of surfactant-free styrene-acrylate coplymer and emulsification of fluid anthraquinone was in-vestigated and a cooking experiment of triploid of polulus tomentosa with the prepared composite emulsion was performed and a performance test was carried out.When using the copolymer emulsion as dispersant an…
In this study,we investigated the microstructure and magnetic properties of Nd2Fe14B/α-Fe nanocrystalline two-phase composite permanent magnets prepared by controlled melt-solidification and amorphous crystallization.Analysis of X-ray diffraction(XRD) showed that,with a wheel speed of 20m/s,a proper degree of undercoo…
Pore structure is one of critical factors for influencing intrinsic characteristic and application effect of metallic porous material. Pore structure is decomposed into pore shape, pore tortuosity and roughness, porosity, pore diameter and surface area. The usual characterization technology and development and technic…
β-cyclodextrin was taken as wall materia1 and the deer placenta polypeptide was made into microcapsules by ultrasonic.The orthogonal test results showed that the optimum conditions of process are as follows:ratio of core material to wall material 1:20,ultrasonic power 160 W,ultrasonic time 100 min,ultrasonic temperatu…
With AlCl3 as catalyst in solution system,the influence of temperature,amounts of catalyst,kinds of solvent on properties of crosslinking and grafting of ethylene-propylene-diene terpolymer(EPDM)were investigated.The results show:At low temperature,the crosslinking reaction is difficult,but the grafting reaction betwe…
The spot welding of rapidly solidified Fe-Cu alloy foils with 35-45 μm in thickness was conducted using a mini-type capacitor discharge welder. The microstructure of nugget was observed. The cooling rate and the temperature gradient of nugget were analyzed theoretically and the relationship between the microstructure…
The uncertainty in the determination of Sn in tin bronze was evaluated by Photoelectric Direct Reading Spectrometry.The uncertainties including calibration curve,standard value,and randomicity of measurement have a great influence on the determination.Therefore,controlling the above factors can effectively reduce the…
This article mainly introduced the prospect and today's major new technology in the coating pretreatment.
A series of Zr-Al-N composite films with different Al contents and a series of Zr-Al-Si-N composite films with different Si contents were prepared by multi-target reactive magnetron sputtering.The films were surveyed with energy dispersive spectroscopy,X-ray diffraction and microhardness tester.The effects of Al conte…