Materials Literature
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Three-point-bending fatigue tests were conducted on both WC-6(mass fraction,the same below)% Co functionally-graded cemented carbides(FGCCs) and conventional WC-6%Co cemented carbides.The relationship between fatigue fracture morphology and failure mechanism were investigated.The results show that the fatigue cracks a…
Electrochemical double layer capacitors(EDLCs) composed of various carbon electrodes with different pore sizes and surface areas[carbon nanotubes,mesoporous activated carbons(MEACs) and microporous activated carbons] and ionic liquids based on lithium bis(trifluoromethane sulfone)imide(LiTFSI) with 2-oxazolidinone(OZO…
Some features and applications of poly(ether ether ketone) were briefly introduced.Several recent surface modification methods for PEEK films were reviewed,including plasma treatment,ultraviolet irradiation,and wet chemistry.In addition,several major surface characterization methods such as scanning electron microscop…
Super absorbent resin(SAR) was prepared via aqueous solution polymerization with acrylic monomer.The influences of functional groups in resin chains,reaction temperature and reaction pH on water absorbency of super absorbent resin were investigated.Results show that methyl have negative effect on water absorbency.Hydr…
Tetrahedral amorphous carbon(ta-C) films were prepared to study the deposition rate,composition,mechanical features and tribological properties as a function of substrate bias at a home-made 45°single bent filtered cathodic vacuum arc deposition system.The results show that the sp3 content in the film first ascends an…
Poly(N-acryloyl-N′-propylpiperazine)(PAcrNPP) is a pH-and temperature-responsive homopolymer.Degree of protonation of PAcrNPP can be changed by adjusting pH of the solution.Cloud point of PAcrNPP increased with increasing degree of protonation.We investigated the effects of different sizes of cyclodextrins(CD) on clou…
Isoprene polymerization behaviors by using Ziegler-Natta catalyst system of Fe(2-EHA)3/Al(i-Bu)3/AIBN has been investigated.The effects of catalyst preformation conditions and polymerization conditions on catalytic activity,microstructure,molecular weight and molecular weight distribution of obtained polymers are syst…
Based on the dielectric theory of chemical bond in crystals,the calculation methods for bond parameters,hardness,isomer shifts and nonlinear optical coefficients of crystals are proposed.These methods establish a link between chemical bond and macroscopic properties,and offer the advantage of applicability to a broad…
Poly(lactic acid)(PLA)/montmorillonite(OMMT) nanocomposites was prepared by melt intercalation.Morphology structure,mechanical properties,thermal properties and dynamic rheological behavior of the composites were characterized and tested,and foaming extrusion behavior of the composites was studied.The results showed t…
Effect of different particle sizes of andalusite on properties of bauxite based gunning refractory were investigated with bauxite as raw materials,calcium aluminate cement and silica flour as binders.After 24h curing in mould and another 24h curing at 110℃ after demoulding,the specimens were heat treated at 1000℃,1300…
A novel method of putting the insulation jacket on transmission line conductor was proposed to improve the electric field strength of high potential side of composite insulator and the principle was studied in detail.The physical model of this method was given in the case of dry contamination.The feasibility of this m…
Using linear HPMC(hydroxypropylmethyl cellulose) and NIPAAm(N-isopropylacrylamide) as raw materials,the temperature-sensitive hydrogels HPMC/PNIPAAm were prepared via the semi-IPN technique.The prepared hydrogels were characterized by Fourier transform infrared(FT-IR) spectroscopy,and their interior morphologies were…
Monodisperse nano-silica microspheres were prepared by conventional Stober method.Silica particles with sizes between 100 to 800 nm were obtained by alkaline hydrolysis of tetraethyl orthosilicate(TEOS) in ethanol solution.The morphology and particle size of nano-silica were investigated using SEM and XRD.The results…
For the requirement of reliability of power supply,the equipment test is changed from power outages at the request of preventive test to a live test mode;hence the live test has been strengthened.During the live testing process for arrester,the resistive current is frequently negative and the three-phase resistive cur…
The sizing amount is regarded as the key process parameter in cold precision sizing based on the hollow devided-flow processing for spur gear with modulus greater than 3.According to the generalized Hooke's Law,the minimum value of sizing amount was calculated.On the basis of forward cold extrusion with hollow divided…
Polyfluorene flims were synthesized electrochemically by direct anodic oxidation of fluorene in the mixed electrolyte of acetic acid and borontrifluoride diethyl etherate(BFEE)(5∶ 4 by volume).The oxidation potential of fluorine in the mixed electrolyte was measured to be only 0.48 V versus Pt,which was much lower tha…
A waterborne polyurethane crosslinking agent was synthesized with isophorone diisocyanate(IPDI) as initial materials,N-methyl diethanolamine(MDEA) as the hydrophilic chain-extender and methyl-ethyl ketoxime as blocking agents.The proper extension reaction time of MDEA hydrophilic chain extension was discussed by NMR,a…
PAN precursors with silicone finishes were carbonized and graphitized.In order to study the evolution of silicone finishes in carbon fibers during heat treatment process,content,chemical state and micro-distribution of Si were studied by DC-Arc-AES,XPS and EPMA respectively.It can be concluded that the content of Si d…
The Effect of A1 and Ti treatment on non-metallic inclusions and microstructures of coarse-grain HAZ in HSLA stee1 was investigated in this paper based on experiments and thermodynamic calculations.The results showed that the inclusions in A1 treated steel were mainly aluminum oxides and titanium nitrides which could…
The β grain growth behavior of TC21 Ti alloy isothermally annealed at different temperature and time was studied.The results show that the curves of β grain growth are approximatively parabolic type.The grain growth exponent(n) at 970 ℃,980 ℃ and 990 ℃ is 0.38,0.34 and 0.32,respectively,and the grain growth activation…