Mu W.N.,Northeastern University China |
Shi S.Z.,Qinhuangdao ShouGang Plate Co. |
Zhai Y.C.,Northeastern University China
Advanced Materials Research | Year: 2013
This work examines the recovery of magnesium from desiliconization slag of nickel laterite ores by carbonation process. The effects of reaction temperature, reaction time, liquid/solid ratio and CO2 flow rate on magnesium dissolution are investigated. The optimized experimental conditions of recovering magnesium were gained by the analysis of orthogonal experiments. © (2013) Trans Tech Publications, Switzerland.
Mu W.N.,Northeastern University China |
Shi S.Z.,Qinhuangdao ShouGang Plate Co.
Polymers and Polymer Composites | Year: 2014
TiO2-organic thin films were fabricated on SAMs-coated silicon substrate based on layer-by-layer self-assembly process and chemical bath deposition method by a hydrolysis of TiCl4 in acid aqueous solution. The influences of deposition time and solution pH value on structural properties and the thickness of TiO2 films were investigated. The results of UV-vis spectrum show the absorbance of aqueous solutions at 410 nm decreases gradually with increasing deposition time and solution pH value. The thickness of TiO2-organic thin film elevates as increasing deposition time and pH value. The deposition time has significant influence on the surface morphology of films, and when the time is 2 h, a continuous, density and homogeneous film is gained from SEM micrographs. The deposited films consisting of TiO2 nanoparticles are believed to be fully amorphous layers from the results of XRD. The major chemical compositions of thin films are titanium and oxygen as presented in EDS results, and O/Ti atomic ratio is close to the corresponding ratio of 2:1 for stoichiometric TiO2. The transmission infrared spectrum and UV/Vis spectrum of TiO2 film indicate excellent structure and optical properties of films. © Smithers Information Ltd., 2014.
Mu W.-N.,Northeastern University China |
Zhai Y.-C.,Northeastern University China |
Shi S.-Z.,Qinhuangdao ShouGang Plate Co.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2013
Titanium oxide thin films were prepared on self-assembled monolayers-coated silicon substrate using layer-by-layer self-assembly method and chemical bath deposition from an aqueous solution. The effects of temperature on structural properties, thickness and morphologies of titanium oxide thin films were investigated. The results show that the absorption peak of peroxo complexes of titanium at 410 nm decreases gradually with increasing the temperature. The deposited films consisting of titanium oxide nanocrystals are believed to be fully amorphous by XRD. Titanium oxide thin films fabricated at 60 C for 2 h are continuous, dense and homogeneous with a size in the range of 20-40 nm by SEM. The chemical compositions of deposited thin films were studied by EDS, and the mole ratio of O to Ti is 2.2:1. © 2013 The Nonferrous Metals Society of China.
Mu W.,Northeastern University China |
Shi S.,Qinhuangdao ShouGang Plate Co.
Applied Mechanics and Materials | Year: 2012
TiO 2 thin films were deposited on SAM-coated silicon substrate by layer-by-layer self-assembly method. The influence of various parameters was investigated to optimize the conditions and the results show that with increasing deposition temperature and deposition time, and decreasing molar ratio of HCl to TiO 2 2+, the content of TiO 2 2+ in the reaction solution decreases. The as-deposited thin films were fully amorphous from the result of XRD, also were homogeneous and continuous produced at 80 °C for120 min as presented in SEM images, and the average size of particles on the thin film surface is approximately 33 nm. © (2012) Trans Tech Publications, Switzerland.
Han Y.,Yanshan University |
Yu E.,Yanshan University |
Zhang H.,Qinhuangdao ShouGang Plate Co. |
Huang D.,Yanshan University
Applied Thermal Engineering | Year: 2013
The medium-frequency heat treatment of the high-frequency induction welded pipe was simulated using the finite element method. Results show that an hourglass-shaped temperature field is formed over the weld seam across the wall thickness. The influences of the current frequency, the current density and the distance between the coil and weld seam on the heating efficiency and the temperature difference across the thickness of weld seam are analyzed. The comparative metallographic experiments are conducted to verify the temperature field. The experimental results show that the medium-frequency heat-treatment process parameters have significant effect on the metallographic structure and mechanical properties. By a careful selection of the heat-treatment parameters it is possible to obtain a temperature field that would optimize the welding quality and the energy consumption. A theoretical method is proposed for the quantitative analysis of medium-frequency induction heat-treatment production. © 2012 Elsevier Ltd. All rights reserved.