Advanced Materials Research Vols. 152-153

Abstract: Proper homogenization, solution and aging technologies of the Al-Zn-Mg-Cu-La alloy were studied in this paper. After 46 /24h homogenization, the dendrite segregation and non-equilibrium phase of the alloy were basically eliminated. At the early stage of aging, the hardness and strength of the alloy increase rapidly, the peak hardness and strength are achieved after 120 aging for 13 h, then maintained at a high level for a long time. The results indicate that the mechanical properties of the A1-Zn-Mg-Cu alloy can be obviously improved by La addition. When the La content is 0.12 wt%，the strength increment is the largest, the tensile strength can be increased by 6.4%, while the elongation is increased by 26%．

Abstract: Based on analyzing the thermodynamic processes in the cylinder when the engine is working, the combustion characteristic of the refined oil-water coal slurry is studied and summarized, and then the reasonable micro-thought explanation of the combustion process is given. Furthermore, the feasibility of the refined oil-water coal slurry combustion in the engine is illustrated through the calculation of the refined oil-water coal slurry in all stages of the ignition temperature and thermal efficiency.

Abstract: All kinds advanced technology is used by enterprises to accelerate product’s developm- ent when facing heavily market competition. It designing for manufacturing (DFM) emphasizes that product’s manufacturing and assembly must be considered fully during phase of design in order to improve product’s competitiveness. The paper indicates it is important that DFA technology in accelerating product’s development.

Abstract: At present almost all low-speed diesel engines burn heavy fuel oil or low-quality fuel oil, the viscosity, low calorific value and impurities are similar as oil-water coal slurry, so, oil-water coal slurry is possible as the fuel of large marine diesel. This article has carried on the description about atomized characteristic of oil-water slurry, and it’s atomizing performance and analysis to the nozzle of type ZCK154S432 and type ZCK154S423 is studied experimentally from different spurting pressure, the different spray nozzle type as well as the different density of refined oil-water slurry, obtained the main factors of affect oil-water slurry’s atomization, illustrated the importance of developing coal instead of oil.

Abstract: A new TiCN-coated aluminum foil for capacitor was prepared by multi-arc ion plating method. The effects of cooling process and mass flow ratio of C2H2 to N2 for deposition on specific capacitance were investigated. Using SEM and XRD, the surface micrograph and phase transformation were analyzed and the temperature sensitivity of specific capacitance was discussed. The results show that specific capacitance of TiCN-coated aluminum foils was as high as 1600μF/cm2, which is higher than the traditional etching process increases by about 2-fold. It was found that composite foil has a strong temperature sensitivity, with the temperature increasing, the aluminum foil surface of TiCN particles were found a gradual trend of growing up, crystal structure from amorphous to crystalline transition, when the temperature was higher than 200°C, the specific capacitance decreased more quickly.

Abstract: Ordered nanostructure arrangement directly from solution onto surface is one of the important methods to synthesis advanced materials. In this paper, solvent-assisted self-assembly of ZnO nanoparticles on mica was investigated. Results showed ZnO nanoparticles were closely linked to each other and formed fork-like nanostructures on mica. ZnO nanostructures were characterized by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The possible mechanism of nanoparticle self-assembly was given. The decrease of solvent density led to the aggregation of nanoparticles. It may provide a simple and effective method to construct nanostructures.

Abstract: In the joint core regions of steel reinforced ultra high strength concrete frame, the forces are complicated. In seismic area or under some exceptional conditions, it is difficult to repair for joint when cracks occur, so crack resistance performance is important. Based on the experiment of steel reinforced ultra high strength concrete (SRUHSC) column to steel reinforced concrete (SRC) beam joint subjected to reversal cycle load, the crack resistance capacity is studied and applied calculation method for crack resistance capacity is proposed. Compared with the test results, the calculated results are in good agreement with them.

Abstract: In this paper, aimed at the characteristic of the coal heap spontaneous combustion, the coal heap inhibitor component was initially determined through the requirements analysis of the inhibitor’s properties, the orthogonal experiment of film–forming property and heating were conducted, and the experiment of inhibition rate and permeability test about the optimal formula were carried on. The results showed that the inhibition rate of this inhibitor could reach 88%. This showed that a new measure was provided to hold back the coal heap spontaneous combustion, the inhibitor also had a function of restraining coal dust raising as a result of the inhibitor’s film-coverage property.

Abstract: Formula and field experiments of road dust suppressant were conducted. The optimal formula of dust suppressant was developed through orthogonal experiment .The moisture content in dust sample sprayed with the dust suppressant was 13.4% after it was left untouched indoor for 21 days. Field experiment was conducted in a big open mine during spring. On the road sprayed with the dust suppressant , the moment dust raising concentration behind the driving truck on the tenth day was 4.9mg/m3 ，lower than post dust concentration required in the national health standard, this shows that the dust suppressant is effective to control road dust raising for 10 days .

Abstract: Influence of glycol, which is the main composition of the most frequently used aircraft dicer, on the freeze-thaw durability of Portland cement concrete were investigated. Freeze-thaw durability of Portland cement concrete was tested by accelerated freeze-thaw test. Four kinds of solutions, namely tap water, 3.5% NaCl solution, glycol solutions and a LBR-A type commercial aircraft deicer were employed to be the freezing-thawing mediums. Results show that freeze-thaw durability of concrete exposed to glycol solutions is closely related to the solution concentrations. Failure of concretes exposed to 3.5% glycol solution is similar to that of those exposed 3.5% NaCl solution, which are attributed to serious surface scaling. While damage of concrete exposed to 12.5% and 25% glycol solutions are postponed, and the durability of concrete are increased. Compared with glycol solution, the commercial aircraft deicer demonstrated much more negative effect to concrete freeze-thaw durability, and the degree even exceeds 3.5% NaCl solution. Consequently, the commercial aircraft deicer is not a kind of environmental friendly deicer as usually considered.