Papers by Author: Yong Zhang

Paper TitlePage

Authors: Jing Long Li, Saburo Sano, Akihiro Tsuzuki, Akihiro Gotou, Yasuo Shibasaki, Fu Sheng Zhang, Jiang Tao Xiong, Yong Zhang, Tie Jun Ma
Abstract: Water-based slurries containing barium ferrite particles have been prepared and slip cast in magnetic field. This paper presents the characteristics of the suspensions in terms of Iso-Electric Points (IEP) and zeta potential that were evaluated through pH titration and polymer adsorption. Both enlarging the specific surface area of particles by planetary milling and adjusting the pH to low value apparently increase the zeta potentials. Stable slurry was obtained by adding polyethylene glycol (PEG) into the suspension at pH = 2 ~ 3.5. The steric repulsion plays key role in dispersion and PEG films served as insulative layers and mechanically kept particles from contact each other. The barium ferrite particles formed many stacks of plates during slip casting, which either aligned randomly without magnetic field applied or regularly aligned to form textured structure when magnetic field was applied.
143
Authors: Feng Hui Wang, Yong Zhang, Hong Wang
Abstract: In recently years, ruby fluorescence spectroscopy has been demonstrated as a powerful technique for monitoring residual stress evolution in the thermally grown oxide scale in thermal barrier coatings(TBC) systems. The measured residual stresses, in turn can be used to monitor evolution of damage in the coatings. Effective use of this technology for real time damage monitoring require the identification of strength in measured stresses that can be used as indicators of damage evolution.the present work focuses on studying the evolution of residual stresses in TBC systems during oxidation. The coating are atmospheric plasma sprayed (APS), the residual stress were measured at different oxidation time and to identify critical features so as to be used as indicators of failure in TBCs.
1047
Authors: Cheng Guang Zhang, Fei Hu Zhang, Yong Zhang
Abstract: The theory of electrochemical jet machining was introduced, and effect of different parameters on anodic electric field intensity is finite element analyzed by ANSYS software. The Simulation results show that, the electric field shares the same distribution under different electrolysis voltage, which generally contains three parts, uniform distribution area, gradually weakened area, scattered area. In the uniform distribution area, electric field shows comparative uniformity. The anode electric field generated by different jet distance is also obvious distribution areas, the electric field intensity shows decreasing trend. Electric field intensity is found to have a close relationship with electro jet nozzle diameter, in which a faster jet velocity would bring more concentrated distribution of the electric field as well as a smaller size of electric field.
2046
Authors: Cheng Guang Zhang, Fei Hu Zhang, Yong Zhang
Abstract: The paper studied that the catalysis mechanism of electrochemical-particles jet compound machining(ECPJM) based on particles impact. The theory was analysed and experiment was carried. The results show that particles impact promoted electrochemical-particles jet compound machining. So the particles impact had the catalysis of the anodic dissolution in the electrochemical-particles jet compound machining. The results also indicate that the processing velocity can be improved under the particles impact, obtaining the surface quality in the electrochemical-particles jet compound machining.
1097
Authors: Cheng Guang Zhang, Fei Hu Zhang, Yong Zhang
Abstract: According to this theory, the cavitation mechanism of ultrasonic-pulse electrochemical compound machining (UPECM) based on particle impact is proposed in the paper. The mechanism was studied particularly, and validated by experiments. The results show that ultrasonic cavitation promote pulse electrochemical compound machining, and particle impact has the catalysis of the anodic dissolution in the ultrasonic-pulse electrochemical compound machining. The results also indicate that the processing velocity can be improved under the particle impact, obtaining the surface quality in UPECM compound machining.
2139
Showing 1 to 5 of 5 Paper Titles