Applied Mechanics and Materials Vols. 687-691

Abstract: A novel cationic type asphalt emulsifier of 2-triethylenetetramine methylene-4-nonylphenol was synthesized by the reaction of nonyl phenol, triethylenetetramine and formaldehyde. The optimum reaction condition was obtained. The yield reaches 49.21% at the optimum reaction condition of the feedstock mole ratio of formaldehyde to nonyl phenol 2.8, feedstock mole ratio of triethylenetetramine to nonyl phenol 1.0, reaction temperature 95°C, and reaction time 5 h. The structure of the emulsifier was identified by FTIR. The emulsifier exhibits satisfactory emulsification. The emulsifier belongs to the class of rapid-set asphalt emulsifiers.

Abstract: The relative adsorption coefficient, a novel parameter was introduced to describe the dominant adsorption ability of ions in cation membrane for all vanadium redox flow battery instead of traditional selectivity coefficient. The parameter as a function of membrane property and vanadium ions in membrane was derived from the relative potential differences in membrane between an isothermal adsorption and an ideal equivalent adsorption. The adsorption isotherms of three kinds of commercial membranes were measured for VO²⁺/H⁺ electrolyte system. The results show the reasonable rules that the relative adsorption coefficients increase as the VO²⁺ contents are increased whereas decrease as the H⁺ contents are increased in electrolyte.

Abstract: To achieve well dispersion of carbon nanotubes (CNTs) and increase the interactions between CNTs and thermoplastics polyurethane (TPU) matrix,a new type of fluorinated carbon nanotube (f-CNT) was modified by fluorine plasma grafting with fluoropolymer. A series of f-CNTs/TPU nanocomposites were prepared by one-step in situ bulk polymerization method. The morphology, thermal property and chemical resistance of nanocomposites were characterized and compared. Results indicated thermal degradation temperature was largely increased and the glass-transition temperature increased from-51.7°C to-42.3°C. Moreover, the chemical resistance was apparent improved.

Abstract: The surface morphologies, chemical composition, phase composition, compactness, thickness and the corrosion resistance of porous anodic films prepared in the sulfuric electrolyte with different additives at 35°C were investigated by XRD, FESEM, EDS, drop method in this paper. The additives are including organic acids, polyhydric alcohols and rare earth (REE) salts. It is indicated that a porously anodic film with about 20 nm holes in diameter can be obtained by additives into the sulfuric electrolyte. The main chemical compositions of the anodic films are Al, O elements, and a small amount of S. The film after boiling water sealing is composed of boehmite phase (Al₂O₃·H₂O) and alumina (Al₂O₃). The corrosion resistance of the anodic film can be improved by the coupling effect of the additives. The mechanism is discussed.

Abstract: Mg-Al alloy is the most common application. Mg-Al alloy has the property of high specific strength and high pecific stiffness, good Vibration property, good electromagnetic shielding and anti radiation ability and so on. So Mg-Al alloy has wide application prospect in automobile, electron, elctrical equipment, transportation, avitation, national defense and military, known as the " twenty-first Century green engineering materials ".

Abstract: As automobile amount increasing, the atmosphere pollution for the automobile emission becomes very serious. In the paper, we have studied vehicle emissions of decontamination by using nanometer titanium dioxide of photocatalysis method in traffic environment. In the study phases, The test result indicated that degradation effect of nanometer titanium dioxide in road surface was well. It may be used in road traffic to protection environment.

Abstract: With the increasing focus on developing environmentally benign electronic packages, Pb-free alloys have received a great deal of attention. Among the lead-free solder materials, Sn–Ag–Cu alloy has advantages of good wetting property, superior interfacial properties, high creep resistance and low coarsening rate. In this article, the organization and mechanical performance of Sn-Ag-Cu Material are investigated. Series of inspections and analytical research methods are introduced. Experimental results show that Sn-Cu solder organization contains a large number of Cu₆Sn₅ graphic, while Sn-Ag-Cu graphic is IMC Ag₃Sn graphic. The mechanical propersity of Sn-Ag-Cu alloy is better than the Sn-Cu alloy. Fracture surfaces of the Sn-Ag3.0-Cu0.5 alloys specimen have many small size and homogeneously distributed dimples.

Abstract: Graphene nanoplatelets (GNP) were prepared by ball milling, and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). PS/GNP composites were produced by a melt process. The flammability of PS/GNP composite was evaluated by the cone calorimeter (Cone) and thermal degradation of the composite by thermogravimetric analyses (TGA). Cone data indicate that the incorporation of 1% GNP leads to a 28% reduction in the peak heat release rate (PHRR) compared to pure PS. There is an synerhistic effect between intumesent flame retardants and GNP in a decrease in PhRR in PS. The incorporation of small amount of GNP can improve thermal stability of PS.

Abstract: The surface composite layer Ni/ZrO₂ on the ZG45 cast steel surface was fabricated through vacuum infiltration casting method. This paper researched on the Ni/ZrO₂ composite infiltrated layer morphology, hardness and the friction property under fry friction. The results show that the added of the ZrO₂ ceramic particles increase the composite infiltrated layer hardness and the wear resistance. The 15% ZrO₂ composite infiltrated layer wear resistance is better than the 10% ZrO₂ composite infiltrated layer. Different ZrO₂ contents have same change trend. The friction coefficient decreases with the temperature increasing. The 10% ZrO₂ friction coefficient changes obviously with the temperature increasing. The 15% ZrO₂ friction coefficient changes evener than the 10% ZrO₂ but the protection of friction and wear is more obvious.

Abstract: The P-type transparent conductive oxide CuAlO₂ was prepared by solid state reaction in this paper. The chemical state, phase structure, microstructure and optical properties were characterized by Differential Thermal Analysis ( DTA),X-ray diffraction ( XRD),Scanning Electron Microscope ( SEM) and Infrared Spectroscopy ( IR) respectively. Testing results show that the product is really p-type transparent conductive oxide CuAlO₂. CuAlO₂ phase began to form at about 1047.7 °C.It can be formed with high density and a high infrared light transmittance of the conductive oxide at 1150 °C.