Papers by Author: Xi Tang Wang

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Authors: Bao Guo Zhang, Zhou Fu Wang, Shao Wei Zhang, Xi Tang Wang, Zi Wei Xu
Abstract: The effects of Y2O3, La2O3 and Nd2O3 on the sintering, microstructure and mechanical properties of magnesia refractories were investigated. Addition of rare earth oxide (ReO) to magnesia refractories increases the bulk density, decreases the porosity and improves the mechanical strength of the refractories. The improved sinterability was attributable to the vacancies generation associated with the solid-solution reactions between MgO and ReO. In the samples with ReO, rare earth silicate phases form at magnesia grain boundaries, providing additional bonding between magnesia grains and between magnesia grains and matrix. Consequently, the samples with ReO showed much higher high temperature strengths than those without ReO.
Authors: Xi Tang Wang, Zhou Fu Wang, Bao Guo Zhang, Cheng Ji Deng
Abstract: Vanadium nitride is produced from V2O5 by carbon-thermal reduction and nitridation. When the sintered temperature is above 1273K, VN can be formed, and the nitrogen content of the products increased with the firing temperature raised, and then is the largest when the sintered temperature is 1573K. The C/V2O5 mass ratio of the green samples is the other key factor affecting on the nitrogen contents of the products. The nitrogen content of the products reaches the most when the C/V2O5 mass ratio is 0.33, which is the theoretical ratio of the carbothermal nitridation of V2O5.
Authors: Hao Liu, Xi Tang Wang, Bao Guo Zhang, Zhou Fu Wang
Abstract: The effects of replacement of MgO by CaO, on the characterization and crystallization behavior of glas-ceramics in the CaO-MgO-SiO2 system were investigated by DTA, XRD and FTIR techniques and by density measurements. The results show that the glass transition temperature (Tg) and crystallization temperature (Tc) increase and glassy structural network becomes denser with increasing the CaO/MgO weight ratio. After certain heat-treatment procedure, the major crystal phases change from calcium magnesium silicate (diopside) to calcium silicate (parawollastonite) at the replace of MgO by CaO. Studying of density measurement shows that, the density of glass samples increase by increasing CaO content on the expense of MgO.
Authors: Xi Tang Wang, Girish M. Kale
Abstract: Microwave sintering behaviors of four different compositions of YSZ electrolyte materials were investigated. The samples were sintered in 2.45GHz microwave furnace. For comparison, conventional sintering was performed at 1821K.The densities of sintered samples showed considerable enhancement in the densification process under the influence of microwave fields. The samples with lower Y2O3 content are easy to sinter. The influence of the composition and sintering methods on the final phase composition and microstructure were investigated by X-ray diffraction and scanning electron microcopy. Finer and more uniform microstructures were observed in the microwave sintered samples comparing to the conventionally sintered samples.
Authors: Zhou Fu Wang, Chun Tian Du, Xi Tang Wang, Bao Guo Zhang
Abstract: Mullite whiskers were prepared by sol-gel method. The preparing conditions, the morphology and crystallite phase of the mullite whiskers were studied by Thermal analysis, XRD and SEM. The results demonstrate that the uniform mullite whiskers with high aspect ratio were obtained in properly preparing conditions and appropriate amount of fluorides.
Authors: Xi Tang Wang, Chen Ze Luo, Bao Guo Zhang
Abstract: In order to assess the behavior of ceramic fibers that are respired and accumulate in the lung, the solubility of bio-soluble CaO-MgO-SiO2 system ceramic fibers was determined by measuring the concentrations of the main components in the Gamble solution after different solution periods. The effect of ZrO2, TiO2, B2O3, Al2O3 and the different CaO/MgO ratio of fibers on the solubility of the ceramic fibers were investigated. The results indicated that the pH value of the Gamble solutions increase with the increasing of solution time. CaO, MgO, SiO2 in the ceramic fiber have greater solubility. The existence of ZrO2 and Al2O3 in the fibers would reduce the solubility of the fibers, and the existence of TiO2, and B2O3 in fibers will benefit the solubility of the fibers.
Authors: Xi Tang Wang, Heng Zhi Wang, Wen Jie Zhang, Jia Lin Sun, Yan Ruo Hong
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