Advanced Materials Research Vol. 803

Abstract: Fittings of the power transmission line are requested to have good anti-corrosion performance when they are use at atmosphere environment. The fittings of the power line have certain mutual movement during application process, which mutually produce friction. In particular to the fittings of the power line which are applied in the area and environment with strong wind sand such as western area, wind sand will produce corrosion wear of the fittings in the line. Therefore the fittings of the power line are requested to have good anti-abrasion and corrosion resistant comprehensive performance. In combination with application environment of the power fittings and characteristics of vacuum zincification technology, carry out analysis on possibility of application of vacuum zincification in the fittings in the power line from performance requirements, fitting materials, geometrical features of the fittings, economy of vacuum zincification etc several aspects.

Abstract: Theoretically illustrates the principle of tension variation during flattening process. Analysis of the changing process of the tension from the perspective of energy consumption. Gives a calculation formula of tension variation on the base of plane assumption. In addition, research the the influences of technological parameters to tension variation by using finite element software . Finally, analyzing the change process of the tension during flattening process.

Abstract: Copper film with rough structure is prepared on metal surface via electro-deposition. After modification of tetradecanoic acid, copper film presents super-hydrophobic property with water contact angle of 151.1°, which could be attributed to the rough structure by trapping air. The adhesion test shows that the modified copper surface has low apparent water adhesion to the suspending droplet. Electrochemical measurement proves that super-hydrophobic film can inhibit corrosion of copper effectively. The method proposed in this paper is time-saving and facile to operate, and it offers a promising technique to prepare metallic surface with super-hydrophobic property.

Abstract: In this paper, the author uses double glow plasma surface metallurgy technology, prepares antibacterial stainless steel with copper-cerium case on its surface, does some research on how work-piece space affects Copper-cerium case thickness and component in the case. According to experiment, we find in the range of 10 mm to 25 mm, copper-cerium case depth firstly increase and then decrease with the distance expands; copper-cerium component first rises and then falls with the work-piece space .When the distance is 15mm, hollow cathode effect forms between two plates, we can obtain ideal copper-cerium alley case.

Abstract: As one of the most important type of gold deposits, hydrothermal gold deposit has become the hot research area of mineral deposits at present and for a long time to come because of its great economic value and ore-prospecting potentials. Mathematical statistics on mineralization abundance, including grade and linear productivity, of a hydrothermal gold deposit in Jiaodong Peninsula, were done. The results show that mineralization abundance of the hydrothermal gold deposit follows lognormal distribution which is consistent with traditional research findings, which have academic significance for further studies on hydrothermal gold mineralization characteristics and deposition mechanism.

Abstract: With the given the boundary and initial conditions, the analysis of internal thermal stress and mechanical stress field distribution was conducted on the special silicon carbide bricks for metallurgical furnace. By the simulation of ANSYS, the results show that a high temperature gradient and thermal stress in the special silicon carbide bricks, with great distortion of pipe within the bricks and a low level of mechanical stress, and the mutual offsetting between mechanical stress and thermal stress in some areas. Key words: metallurgy; new; silicon carbide; thermal stress; mechanical stress.

Abstract: The fine particles classification properties in a gas-solid multilevel particular fluidization tower (MPFT) with the rectangular body of 2.4 m in height and 0.032 m² in cross sectional area, five tower plates of 0.39 m in length and 0.08 m in width and 0.005 m in thickness were investigated using two different properties particles, talc particle and quarts sand particle, as solid phase and air as gas phase. It was found from the experimental results that the pressure drop increases with increasing superficial gas velocity. And the spread of pressure drop was gradually decreased from top to bottom in the tower. The grade efficiency for talc powder particle (d_p = 10 μm) attained 78.78% and d95 reached 12.84 μm at U_g = 0.122 m/s. Meanwhile, for quartz sand particle (d_p = 10 μm), the grade efficiency attained 92.80% and d95 reached 12.58 μm at U_g = 0.139 m/s. The grade efficiency for the two different properties particles both increases with decreasing feed rate at these experimental conditions in this work. The particle size distribution range of overflow particle increases a little with increasing circulating gas velocity. The grade efficiency for quartz sand particle (d_p = 10 μm) dropped from 92.56% to 82.70% with increasing different regurgitant rates from 0 to 12.5 kg/h.

Abstract: High-energy ball mill of a mixture of H₂C₂O₄·2H₂O, Co (NO₃)₂·6H₂O(A.R) has been used to produce nanocrystalline cobalt oxalate powders of nearly spherical shape. After the CoH₂C₂O₄·2H₂O powders have been dispersed by spray-drying, it has been decomposed at 400~550°C to obtain cobalt powders. The microstructure of the powders produced using ball milling and thermodynamical analysis for reaction and decomposition temperature have been studied. The powders were characterized by X-ray Diffraction, Scanning Electron Microscopy. It has been identified that a spherical, fcc structure, 100nm β-Co powders was synthesized.

Abstract: In order to eliminate the hazards of fluoride, the low melting point and boosting substances of Li₂O, BaO, B₂O₃ were added into the low C peritectic steel mold powder replaced fluoride. It makes fluorine-free protection slag successfully developed. The crystalline ore phase of Fluorine-free mould slag is melilite. By adjustment crystallization ratio of melilite in slag film, the heat flow through the mold can be controlled.

Abstract: Using the ProCast casting simulation software to make squeeze casting process simulation and analysis of the solidification process of the air conditioning compressor front cover and predict the location of gas volumes and shrinkage defects in the filling process. When adjusted the process parameters, volumes gas defects were eliminated, but there was still shrinkage occurs in the center. When imposed a secondary pressure on the central part, shrinkage was eliminated.