Materials Literature
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Chemical mechanical planarization(CMP) of Cu based alkaline Cu slurry in GLSI was investigated.Based on the CMP mechanism analysis of Cu in alkaline slurry,the performance of Cu removal rate and surface roughness with low down pressure were discussed in this paper.It is showed that with RNHOH as complexing agent,alkal…
UV accelerated aging was performed on polyurea anti-corrosion coatings.The aging behavior of the coatings was analyzed by gloss meter,scanning electron microscope(SEM)and Fourier transform infrared spectroscopy(FTIR)in combination with electrochemical impedance spectroscopy(EIS).Experiment results indicate that the co…
Force ripple caused by cogging force is one of the main reasons which prevent permanent magnet motors from acquiring high performance.Aiming at reducing cogging force in permanent magnet linear motors,taking into account of the structural features of linear motors,an analytical method based on energy method and Fourie…
The effects of supercritical CO2 treatment pressure on the structure and properties of soybean fiber are investigated by X-ray diffraction(WAXS),infrared spectroscopy(FT-IR),thermogravimetry analysis(TGA),differential scanning calorimetry(DSC)and scanning electron microscope(SEM) technology.The results indicate that t…
Three wave-guide rods including disc-rod,cap-rod and flexible rod were designed so as to test high/ low-temperature vessels using ordinary AE sensors.For some special conditions,some support/fixed members protruded from insulation and welded to vessel shells can be directly used as wave-guide rods,and water-ice coupli…
Structure of plastic mould steel 3Cr2MnNiMo with thickness 800 mm,treated by quenching and high temperature tempering,composed of tempered sorbite,tempered low bainite and granular bainite.Alloying element segregation result in inhomogeneous structure and local microhardness increase with segregation level increased.T…
Nucleus,the beginning of a new phase,underlies the understanding of various synthetic approaches of nanomaterials,especially for the control over their sizes and shapes.Ultrafine nanocrystals with sizes smaller than 5 nm provide ideal models to learn the properties and growth behaviors of nucleus.The size and surface…
The catalyst precursors of B-Ni_2P/SBA-15 were synthesized by co-impregnation using (NH_4)_2HPO_4 as the source of phosphorus,Ni(NO)_3 as the source of nickel and H_3BO_3 as the source of boron.The B-Ni_2P/SBA-15 catalysts with an initial P/Ni molar ratio of 0.8 and a boron content from 0.35%to 2.10%(w) were prepared…
High-purity and single-phase PbI2 polycrystals were synthesized by a modified two-zone vapor transporting method(MTVTM).The method is easy in operation and can effectively prevent the ampoule from exploding.XRD results indicate that the structure of PbI2 crystal is 2H with hexagonal space group of P3ml,the lattice con…
Methylacrylic acid(MAA),acrylonitrile(AN),acrylamide(AM) and methyl methacrylate(MMA) were polymerized byγ-rays,and AN/AM/MAA copolymer as well as polymethylmethacrylate(PMMA) were synthesized. Then microporous structure of polymethacrylimide(PMI) was obtained by the degradation of PMMA using heat-treatment.FⅡR spectr…
The studies of Superalloy and Intermetallic Group of Institute of Metal Research in the past fifty years on the phase transformation phenomena in Fe-and Ni-base superalloys were reviewed.The phase transformations in the two kinds of superalloys include: the solidification reactions which occur during the solidificatio…
A triaxial deformation apparatus with 3 GPa molten salt medium pressure vessel was developed.It is based on the conventional Griggs design and the molten salt cell concept modified.There is a huge difference between apparent confined pressure and true confined pressure due to the friction in the assembly and the stren…
The particles of Fe-1%C(mole fraction) alloy with the single phase solid solution nanocrystalline were produced by mechanical milling.The influences of milling time on the particles morphologies and the grain size were investigated by scanning electron microscopy(SEM) and X-ray diffractometry(XRD).Applying Scherrer fo…
In this paper,Layered double hydroxides had been melt-grafted by the ethylene-acrylic acid random copolymer and then blended with high-density polyethylene to prepare nanocomposites.The results showed that the mechanical properties of nanocomposites were enhanced,the Izod impact strength was enhanced about 25 percent,…
Poly-12-hydroxy stearic acid-polyethylene polyamine hyperdispersant was synthesized using 12-hydroxy stearic acid and polyethylene polyamine as main materials.The catalysts varieties,the amounts of catalysts,reaction temperature and reaction time on the acid value of product were discussed.The optimal synthesis condit…
In this work, the effect of surface treatment on mesoporous carbons (MCs) supports was investigated by analyzing surface functional groups. MCs were prepared by a conventional templating method using mesoporous silica (SBA-15) for using catalyst supports in direct methanol fuel cells (DMFCs). The MCs were treated with…
A numerical simulation study on chemical kinetics process of engine combustion fueled with biodiesel was performed by using single-zone model coupled with a detailed kinetic model.Based on the chemical kinetics,emissions on the SOOT of the combustion of diesel mixed with biodiesel could be concluded from analyzing the…
The cerium conversion coatings were prepared on hot-dip galvanized(HDG) steel sheets treated in 20 g/L Ce(NO3)3·6H2O solution(pH = 4,25 ℃).The corrosion electrochemical behavior of the cerium conversion coatings was compared with that of blank hot-dip galvanized sample in 5% NaCl solution using polarization curves and…
Half shaft bushing is a kind of long shaft hollow forging.The hot extrusion process was determined based on the structural characteristics and requirements of this product.The major process parameters which influence forming force,including blank temperature,extruding velocity,warming-up temperature of dies,friction c…
The thermal dehydration of phosphogypsum has been studied by using thermogravimetry and differential scanning calorimetry techniques.A Netzsch STA 409PC simultaneous TG/DSC instrument was used to collect thermogravimetric and calorimetric data.Experiments were carried out at four different heating rates of 2.5,5.0,10…