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Guo Y.L.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Zhao H.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Tang L.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Wang Y.J.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | And 2 more authors.
Materials Science Forum | Year: 2015

Monolithic zirconia-molybdenum (m-ZrO2/Mo) cermets have been prepared by traditional powder metallurgy process with molybdenum volume concentration of 30% and different molybdenum powders with average particle sizes of 80nm, 3μm, 8μm and 13μm. The influence of metal particle size on the morphology and electrical conductivity of the cermet has been investigated. The electrical resistivity of the cermet was measured via 4-probe DC technique from 500 ˚C to 1600 ˚C. All the samples showed the positive temperature coefficient of electrical resistivity, but the sample prepared with 80 nm molybdenum powder showed very high resistivity over 0.5 Ω·cm. Hot-press sintering was proved to be helpful to the elongated conductive phase formation, thus the electrical conductivity of cermet increased compared to the pressureless sintering process. © (2015) Trans Tech Publications, Switzerland. Source


Guo Y.-L.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Tang L.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Zhao H.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Wang Y.-J.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | And 2 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2014

Three ceramics, pure monolithic zirconia (m-ZrO2), 3%(mol) Y2O3 doped partially stabilized zirconia (3Y-PSZ) and 12%(mol) CeO2 doped PSZ (12Ce-PSZ), were chosen for preparing three cermets by adding 30%(ψ) Mo. The relative density of the cermets was over 95%. Their static corrosion tests were conducted in a tube furnace at 1600°C for 4 h in molten IF steel and Al2O3-CaO-MgO slag respectively, and their corrosion behaviors observed. The results show that the cermet with pure m-ZrO2 has better corrosion resistance to liquid steel while the cermet with 3Y-PSZ has better corrosion resistance to molten slag. The corrosion of cermet by liquid steel is mainly involved with formation of intermetallic compounds between Fe and Mo, and the corrosion of cermet by molten slag mainly with the reaction of ZrO2 and CaO in slag for formation of CaZrO3. Source


Lin C.,Shanghai University of Engineering Science | Wang S.,Shanghai University of Engineering Science | Chen G.,Shanghai University of Engineering Science | Wang K.,Center for Research in Computational Thermochemistry | And 5 more authors.
Ceramics International | Year: 2016

Based upon the experimental data available in the literature and present measurements, thermodynamic reassessments were initially performed on the binary BaO-ZrO2, BaO-YO1.5 systems, and the resultant thermodynamic parameters were then merged in combination with that of the previous ZrO2-YO1.5 system to derive a self-consistent thermodynamic description for the ZrO2-BaO-YO1.5 ternary system with limited ternary thermodynamic parameters. The Gibbs energies of all the liquid and terminal solid solution phases were treated by the substitutional solution model, the BZ phase featured by second solid solution described by the compound energy formalism (CEF) model, and the stoichiometric compound BZY424 and Ba2YZrO6-d modeled following the Neumann-Kopp rule. The calculated results agree well with the isothermal sections at 1600°C and 1750°C (1873K and 1923K) from both of the previous and present measured phase diagrams. This demonstrates that the thermodynamic parameters derived in the present work could be applicable to compositional optimizations of novel refractories for melting titanium alloys on the basis of this ternary oxide system. © 2016 Elsevier Ltd and Techna Group S.r.l. Source


Chen G.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Cheng Z.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Wang S.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | Qin Z.,Shanghai Key Laboratory of Modem Metallurgy and Materials Processing | And 4 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2016

Titanium alloy was melted in a BaZrO3 crucible by an induction melting process. The microstructure of BaZrO3 refractory and the mutual dissolution after melted at different time were analyzed by optical microscopy, scanning electron microscopy, X-ray diffraction and atomic emission spectrometry, respectively. The interfacial reaction between titanium melt and BaZrO3 refractory and the dissolve behavior of BaZrO3 at different time were investigated. The results show that the thickness of BaZrO3 refractory permeable layer is approximately 20 μm after melting a low-titanium content alloy. The oxygen content reduces and the zirconium content does not change when BaZrO3 refractory contacts with the time, indicating that the BaZrO3 refractory does not react with titanium melt. Meanwhile, the thickness of BaZrO3 refractory erosion layer is approximately 2000 μm after melting a high-titanium content alloy. The oxygen and zirconium contents increase with increasing the contact time, showing that the BaZrO3 refractory reacts with titanium melt and BaO appears during the melting process. © 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved. Source


Jiang M.,Shanghai University | Chen L.-N.,Shanghai University | He J.,Shanghai University | Chen G.-Y.,Shanghai University | And 4 more authors.
Advances in Manufacturing | Year: 2014

The study of controlled rolling/controlled cooling process parameters which affect the microstructure and mechanical properties of a novel pipeline steel have been optimized by the orthogonal experiment with four factors and three levels in this paper. However, the parameters of thermo-mechanical control process (TMCP) optimized by the Gleeble-3500 hot simulator could not satisfy performance requirements of the X100 pipeline steel. In order to improve the performance of this steel, the influence of finish cooling temperature (FCT) on the microstructure and property is studied in detail. It is found that, as this steel is thermo-mechanically treated by this set of parameters (the start heating temperature, finish rolling temperature (FRT), FCT and cooling rate of 1,180 ˚C, 810 ˚C, 350 ˚C and 35 ˚C/s, respectively), the microstructures are mainly composed of granular bainite (GB) and acicular ferrite (AF). The effective grain sizes are below 20 lm; the steel reached the optimal balance between the strength and the toughness; the yield strength is 695 MPa; the tensile strength is 768 MPa; the elongation is 16.6 %; the impact energy is 262 J at room temperature. All indexes could meet the requirements of X100 pipeline steel. © 2014 Shanghai University and Springer-Verlag Berlin Heidelberg. Source

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