Materials Literature
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TiB2/WC/h-BN self-lubricating ceramic material with the addition of solid lubricant h-BN was prepared with vacuum hot-pressing sintering technique.Mechanical properties and density were tested.The phase and microstructure of the material were analyzed by X-ray diffraction and SEM. The results show that the relative de…
Transversal pre-strain experiments were carried out to investigate the effect of transversal hole enlargement on the tensile strain behavior of multi-phase pipeline steel. Experimental results indicate that the work hardening behavior after pre-strain treatment has directional characterization. When the pre-strain dir…
For the majority of gas insulated switchgear(GIS) being operated the built-in ultra-high-frequency(UHF) coupler has still not been installed, and in view of that the basin-type insulator is overlaid by metal ring, the conventional detection method cannot detect the UHF signal of partial discharge inside the GIS, there…
Aiming at problems that rock is opaque and damage can not be observed easily, the method of coupling smoothed particle hydrodynamics(SPH) method with finite element method are used to investigate the mechanism and damage evolution of abrasive water jet impaction on rock which is based on J-H-C damage constitutive mode…
A high performance liquid chromatographic method (HPLC) was developed for the chiral separation of six α-aryl tetralone derivatives, using a Chiralpak IC column. The factors influencing the chiral separation including the type and concentration of organic modifier, column temperature and flow rate were investigated. T…
To complete the aero-engine diffuser integral investment casting,to improve the qualified rate of casting and to reduce the casting cost,the casting process is simulated using ProCAST. The results show that there are dispersed porosity near the lower reinforcing ribs of casting when the shell adopts insulation blanket…
Studying the effects of environmental factors on norfloxacin sorption to kaolin is helpful for understanding sorption and transport of norfloxacin in soils. The static sorption experiment results showed that the sorption process of norfloxacin follows a pseudo-second-order kinetic equation( R2 0. 999),regardless of th…
The existing models for water retention and unsaturated permeability are successful at higher water contents but often give poor results at lower water contents. The water retention curve can be divided into capillary and adsorption segments by a dividing point, where the residual volumetric water content is assumed t…
The structural parameters of 36 lubricating additives of N-containing heterocyclic derivatives with the matrices of benzoxazole,benzimidazole,benzothiazole,thiazoline and piperazine were calculated by Hartree-Fock ab initio quantum chemistry method.Quantitative Structure-Tribo-ability Relationship(QSTR) of these addit…
To study the penetration performance of light alloy liner,the jet formation and penetration against steel targets of two types of Titanium alloy conical shaped charge with large apex angle were investigated by means of flash X-ray photographs.The results show that,the shaped charges with apex angle 140°generate explos…
In order to probe the feasibility of culturing insert-nucleus pearl in visceral mass of freshwater oyster, the different sites of visceral mass were inserted with nucleus in Hyriopsis cumingii. The morphology, formation and nacre deposition of the pearl sac or insert-nucleus positions were observed after inserting nuc…
The MDEA decarburization process of a domestic CBM is simulated and its key parameters are analyzed.The results show that the decarburization fraction and reboiler duty increase with feed gas pressure. It is found that there is an optimal MDEA circulation rate which results in relatively high decarburization fraction…
Chlorination technology and sulphation technology are the main process of producing titanium dioxide powders,chlorination technology is a international development tendency to producing titania powders because of the environment and production advantages.The development and current situation of chloride process are de…
Ni-Ce/Al2O3catalysts with different Ce contents were prepared by wet impregnation method usingγ-Al2O3as support,and their catalytic performance of CO methanation in slurry-bed reactor were evaluated.The catalysts were characterized with XRD,BET,H2-TPR,CO-TPD,and the relationship between the microstructural properties…
The surface modification of magnesium-aluminum hydrotalcites was made by sodium dodecyl benzene sulfonate(SDBS), Tween-80 and anionic-nonionic surfactant. Inverse gas chromatography(IGC) was used to investigate the surface properties of the MgAl-LDHs, SDBS-LDHs, Tween-LDHs and SDBS/Tween-LDHs. The surface free energy(…
Nanocomposite tobermorite whiskers were prepared by dynamic hydrothermal method using ordinary fly ash from somewhere in Shanxi as raw material. The effects of molar ratio of CaO to SiO2, reaction temperature, ratio of liquid to solid and reaction time on the synthesis of tobermorite whiskers were examined. The result…
The development of epoxy polymer chain extenders is introduced. The related synthesis technologies are overviewed. The applications of epoxy polymer chain extenders in PA,PET / PBT and PLA are described as well. In the end,the prospects of the epoxy polymer chain extender are proposed.
To guide the design and optimization of valve halls in ultra high voltage DC(UHVDC) transmission system, we studied the discharge characteristics of typical air gap in valve hall through experiments of switching impulse test. Using typical air gaps and the up-and-down method, we obtained the relationship between the g…
Effects of carbonic acid erosion on compressive strength loss of mortars,mass loss,microstructure and composition change of cement pastes were studied to reveal the degradation process and deterioration mechanism of cement-based materials.The results indicate that the resistance to carbonic acid erosion of cement past…
The effect of counterpart surface roughness on the frictional behavior of PEEK and PEEKbonded carbon fiber composites were investigated on a pin-on-disc wear test apparatus under water lubrication.The contact configuration used was a polymer pin on a rotating 316 stainless steel disc.The compared results showed that c…