Papers by Author: Fang Lian

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Authors: Li Hua Xu, Zhi Fei Cheng, Fang Lian, Ti Zhuang Wang, Yun Yao
Abstract: Carbon-containing refractories are widely used in metallurgical industry due to their excellent thermal property and resistance to corrosion by molten iron. In the present work, slip casting colloidal process, which is used to fabricate high performance structural ceramics, has been introduced into the preparation for magnesia-carbon refractory with selection of suitable dispersant. The results indicated that the curve of zeta-potential of magnesia was similar with that of carbon just containing dispersant and the homogenized mixtures were attained under a controlling of low pH value. Three kinds of preparing routes for green bodies were designed, and all of the final densities and the resultant hardness of sintered bodies using colloidal process were superior to these of the specimen using conventional dry pressing, whereas its high green density can be plausibly observed in dry pressing body because of high compaction pressure used.
Authors: Li Hua Xu, Fang Lian, Li Chen, Yun Ping Di, Ming Liu, Wen Xia, Bin Xu, Yun Yao
Authors: Fang Lian, Zhong Bao Yu, Sheng Wen Zhong, Li Hua Xu, Qing Guo Liu
Abstract: AA size Li-ion batteries using LiCoO2, MCMB and lithium metal as cathode, anode and reference electrode respectively were assembled, in order to study the individual effect of anode and cathode on the cyclic and overcharge performances. The experimental results showed that the LiCoO2 cathode was the main electrode related to the capacity decay and discharge voltage drop. Increasing polarization of the LiCoO2 cathode, especially at overcharge situation, and the irreversible change of cathode structure led to reduction of discharge capacity and voltage plateau of batteries.
Authors: Fang Lian, Li Hua Xu, Zhi Fu, Ning Chen
Abstract: The electronic structure of Ba(Mg1/3Nb2/3)O3 as a typical example of Ba(B¢1/3B¢¢2/3)O3 complex perovskites was investigated using the quantum chemical SCF- Xa-SW method. The calculations indicated that ionic bond strength plays the most important role in the structure stability of Ba(Mg1/3Nb2/3)O3 and BaTiO3. It was found that the bonding strength between oxygen and cations of B-site in Ba(Mg1/3Nb2/3)O3 is greater than that in BaTiO3, and the unbalance force in Ba(Mg1/3Nb2/3)O3 leads to the tendency of B-site ion arranging orderly. The more stable ordered structure of BMN phase can contribute to their better dielectric properties. The calculated results agree with the experimental observations, so it is helpful to designing and synthesizing the microwave dielectric ceramic with high Q-factor.
Authors: Li Hua Xu, Gui Qiu Nie, Fang Lian, Ji Zhou Bai, Hua Chen, Zhi Fu, Ru Sheng He, Yang Bao Qian, José Maria F. Ferreira
Authors: Yu Juan Guo, Fang Lian, Li Hua Xu, Hong Shun Hao
Abstract: This presented a route to utilize the Tungsten Molybdenum Bismuth Polymetallic Tailings in Shizhuyuan of Hunan province to fabricate Ca-substitued α-Sialon eco-materials. The reaction mechanism in carbothermal reduction nitridation process was widely studied by separately considering the effect of sintering temperature and soaking time. Based on the optimized conditions, a composite containing 78% Ca-based α-Sialon has been fabricated at 1600°C for 8h.
Authors: Fang Lian, Yan Li, Yang Hu, Sheng Wen Zhong, Li Hua Xu, Qing Guo Liu
Abstract: The rate capability of 18650 lithium-ion cells was studied in the paper. The experimental results showed that the reversible capacity declined to 89.5, 85.8 and 81.2% of the initial capacity after 300 cycles at discharge rate of 0.5, 1 and 2C, respectively. The XRD and SAED analysis indicated that at a high current density partial positive electrode material LiCoO2 transformed gradually from well-layered structure to rock salt cubic crystal. Upon the cycling, the degradation of cathode materials’ structure and much thicker negative film on anode electrode surface contributed to the rate capability fade.
Authors: Li Hua Xu, Xiao Meng Zhang, Fang Lian, Yun Ping Di, Huan Wang, Ming Liu, Ti Zhuang Wang, Wen Chao Li
Abstract: SiAlON family matrix materials have been fabricated from nonmetallic mine. The process of Carbothermal Reduction and Nitridation (CRN) is selected on the basis of raw rocks containing various Si/Al ratios. Thermodynamic analysis of Si-Al-O-N system at different sintering temperatures indicates once the temperature is above 1673 K, a series of chemical reactions occur in sequence, SiO2, SiO, Si2N2O, SiO2+Al2O3, mullite, X-SiAlON, O′-SiAlON, β-SiAlON, SiAlON- polytypiods and Si3N4+AlN. Moreover, most of the reactions are exothermal and are promoted by further heating. The adding or in-situ formed SiC can reduce mullite and Al2O3 to produce O′- or β-SiAlON, and its reaction is surprisingly endothermic and is inhibited when further heated. Also, atmosphere is essential to affect the sintering process. Either raising N2 partial pressures or reducing CO partial pressures can accelerate CRN progress. Correspondingly, phase content and microstructure of the product converted from nonmetallic ore are in detail investigated via X-ray diffraction (XRD) and scanning electron microscopy (SEM).
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