Materials Literature
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The melt of Al-20%Si alloy was modified after remelting by P,and then mixed with pure zinc melt to fabricate in-situ silicon particles reinforced zinc matrix composites.The microstructure and mechanical properties of the composites were studied.The results indicate that the size and distribution of silicon particles i…
In connection with the production of suede fabric,alkali deweighting treatment processes for two different superfine fiber fabrics were studied by means of orthogonal experiment design,and the effects of alkali concentration, processing temperature and time on peeling were discussed.The results indicated that the opti…
Rollers of the full ball bearing which only being used for 5 days failed with surface exfoliation and flaking.By adopting macro examination,metallographic examination,chemical compositions analysis and hardness test the failure reason was analyzed.The result indicate that not sufficient tempering,steep carburized laye…
The process about mechanical energy of plastic deformation tranforms into heat has been investigated, as it is carried at low strain rate(0.00067s~(-1)) when static stretching.Based on the analysis of energy distribution at static stretching,a heat transfer model is established and solved by using the explicit finite…
Carbon Nanotubes(CNTs)/CdS core-shell nanowires were prepared through a room-temperature chemical reduction method by using bamboo-shaped CNTs as template.The morphology and the phases of the resultants were characterized with transmittance electron microscope(TEM) and X ray diffraction(XRD) techniques,respectively.It…
Nano-Al2O3 reinforced silicone coating was prepared on polyimide substrate by adding silane coupling reagent modified nano-Al2 O3 into silicone resin.Oxygen plasma source generated by thermal cathode filament discharge was used to simulate the atomic oxygen environment.Mass loss,surface morphology and chemical composi…
The ABS/PVC alloy for injection was prepared by melting blending method.The effect of ACR,flow modifier,Sb2O3 and zinc borate on the impact strength,tensile strength,Vicat softening point,melt flow index and the flame retardancy of the alloy were studied.The results indicated that the impact strength reached 42.34 kJ/…
With cetyltrimethylammoniumbromide(CTAB) as emulsifier,azobisisobutryamide chloride(AIBA) as initiator,styrene(St),butyl acrylate(BA) and methyl methacrylate(MMA) as main comonomers,cationic styrene-acrylate emulsion with core-shell structure was prepared by seeded emulsion polymerization.Meanwhile,cationic monomer [2…
The influence of residual stress profiles on the mechanical properties of cold-drawn pearlitic steel wires is discussed,on a basis of the review of the progressing achievement in theoretical and experimental research of residual stress in high-strength steel wires.The role of residual stress is taken into account when…
The effect of heating rates on the formation of network carbides in casting microstructures including chill zone,columnar crystal zone and equiaxed crystal zone in GCr15 continuous casting billet was studied.The experimental results show that the formation of network carbide is obviously retarded in different zones,an…
In this paper, the main chain micro-structure, hydroxyl group type, epoxy group and functionality distribution of prepolymers and the mechanical properties of the cured for samples A and B of HTPB prepared by free radical polymerization were compared by means of FT-IR, HNMR, CNMR and GPC,There are little difference in…
A series of novel copolycondensation type polyimides containing pyridine ring were successfully prepared via two-step reaction from mixed diamines and three dianhydrides,respectively. The chemical structures of the resulting polymers were characterized by Fourier transform infrared spectrum(FT-IR) spectroscopy and 1H…
Influence of different contents of NH_4HF_2 on property of electroless Ni-P plating on AZ31 magnesium alloy was studied.Plating rate and buffering of electrolyte,morphology and corrosion resistance of coatings were studied by means of mass gain method,accurate pH gauge, SEM and potentiodynamic polarization curve etc.R…
The Ca0.4Sr0.6Bi4Ti4O15 thick films are prepared on Si(100) substrate by powder-sol processing and rapid annealing technology.The effect of rotate speed and annealing temperature on CSBT-0.4 thick films structure are investigated.The crystal structure of thick films is characterized by XRD.The morphologies of samples…
Pure ZnO and different Fe-doped ZnO nanoparticles were prepared by direct precipitation method with ZnSO_4,NH_4HCO_3 and Fe_2(SO_4)_3·7H_2O as the raw materials.The structures were characterized by X-ray diffractometry.The photocatalytic performance of different Fe-ZnO samples was studied using an ultraviolet lamp as…
The Fe-Ti-N mater alloy was prepared through the in-situ reaction of nitrogen gas with the Fe-Ti melt.Scanning electron microscope results show that the particles uniformly distributed in the iron matrix were TiN.The deliberately prepared Fe-Ti-N master alloy was employed for the 409L ferritic stainless steel in an at…
The ultra-fine powder was prepared by mechanical alloying (MA),and the Al2O3-TiB2 composite ceramic coatings were prepared by solid sate reaction method on Q235 surface.The phase composition of powder and coatings,particle size,coatings cross section were studied by X-ray,Laser particle size analyzer,SEM and DTA.And t…
The powders of Ce 0.8 Sm 0.2 O 2-δ (SDC)and La 0.7 Sr 0.3-x Ca x Co 0.9 Fe 0.1 O 3-δ (x=0,0.1,0.2,0.3) (LSCCF) were synthesized by the citric acid sol-gel method.The powders were characterized by TG-DTA、XRD and TEM.The electro synthesis ammonia cells were made up using LSCCF powders as cathode,Ni-SDC as anode and Nafi…
According to the microanalysis of the contact materials after arc erosion,arc erosion morphology features is found.That is molten droplets,void and erosion pit.And the greater diameter of tungsten and content of Cu is,the bader is its erosion.
N-lactosam-O-histamine acylated carboxymethyl chitosan was synthesized by lactose groups and histamine grafted with O-carboxymethyl chitosan;the pH-sensitive nanomicelles were prepared by the probe ultrasonication method;the release behavior of the drug-loaded nanoparticles was studied by the dialyzer method.The resul…