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Effect of heat treatment on the crystallization toughening of tailing-derived glass-ceramics
Du Yongsheng,Yang Xiaowei,Zhang Hongxia,Zhang Xuefeng,Zhao Ming,Chen Hua,Ouyang Shunli,Li Baowei 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
The effect of heat treatment to a parent glass of the composition CaO-MgO-Al2O3-SiO2 (CMAS) on the course ofcrystallization and properties of the Bayan Obo east mine tailing glass-ceramics is examined. The crystallization behavior,phase composition, morphology and structure of glass-ceramics are characterized. The results indicate that the phases formedin the glass-ceramics are augite and the initial nucleation phases are magnetite, which can be proved by differential scanningcalorimetry (DSC), X-ray diffraction (XRD) and scanning transmission electron microscope (STEM). Heat treatment plays asignificant role in improving the crystallization process, fracture characteristics, modulus and bending strength. All of theseproperties reach a maximum for the fully crystallized glass-ceramic. Scanning electron microscope (SEM) and atomic forcemicroscope (AFM) are used to reveal the topography of the fracture surfaces. The intergranular fracture can be observed onthe fracture surface.
Du Yongsheng,Ma Jie,Zhang Xuefeng,Zhang Hongxia,Chen Hua,Ouyang Shunli,Baowei Li 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
Tailings glass-ceramics doped with different proportion of CeO2 were prepared by conventional melts and controllable crystallization. The effect of CeO2 on the microstructure, element distribution characteristics and fracture toughness of glassceramics was studied in this paper. Significant change in microstructure was not observed with the addition of rare earth oxide, but the phenomenon of element aggregates begins to appear in glass-ceramics and the element enrichment of Si, Al, Na and Ce can be observed in the element aggregates. As a result, the integrity of the glass network structure can be improved and the strength of glass phase contributed to the enhancement of fracture toughness. The doping of 3.0% CeO2 achieved a remarkable improvement on fracture toughness that reached 2.86 MPa*m1/2 with a Vickers hardness of 8.49 GPa.
Yongsheng Du,Ying Wei,Zhicheng Zheng,Yuhang Guo,Hongxia Zhang,Leibo Deng,Hua Chen,Ming Zhao 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
In this paper, manganese-containing blast furnace slag (MBFS) was used as the main raw material and Cr2O3 was used asthe nucleating agent to prepare MBFS glass-ceramic by melting method. The influence of multiple heavy metal ions on thecrystallization characteristics, physical and chemical properties of glass-ceramic was studied by adding CuO and ZnO, and theexistence of multiple heavy metal ions in glass-ceramic and its curing effect were determined. The results showed that Cr wasthe key element for crystallization of glass-ceramic, which can enable volume crystallization to occur. The glass-ceramics withdiopside as the main crystalline phase had excellent comprehensive physical and chemical properties. The results of TCLPheavy metal leaching experiments also confirmed that spinel crystal wrapped by diopside and glass phase can produce anexcellent solidification effect on multiple heavy metals.
Interval grey number of energy consumption helps task offloading in the mobile environment
Yongsheng Hao,Qi Wang,Jie Cao,Tinghuai Ma,Jinglin Du,Xin Zhang 한국통신학회 2023 ICT Express Vol.9 No.3
The mobile device has been widely used in many areas. Task offloading is always used to overcome the limitation of processing ability and energy-supply of the mobile devices in the mobile cloud environment. Most researches suppose we know the detail of task (number of instructions) of every sub-task. But most of time, to get the detail of a task is very difficult. This paper uses the grey number to express that uncertain information and propose method to evaluate the performance of offloading tasks. Simulations show that our method selects the solution with the lowest energy consumption.
Recovery of Bisphenol A by pH-Triggered Magnetic Nanoparticles
Yongsheng Jia,Enze Li,Zhiping Du,Jianfeng Li,Fangqin Cheng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.5
Bisphenol A is not only one of the frequent contaminants of industrial wastewater, but also one of the main ingredients in polycarbonate and epoxy resins. This study synthesizes a pH-triggered Fe3O4@mSiO2@DPDES adsorbent for recycling Bisphenol A through adsorption–desorption process. Due to the strong π–π interaction between the phenyl groups in diphenyldiethoxysilane modified magnetic nanoparticles (MNPs) and Bisphenol A, absorbance reached 120.17 mg/g at pH 7, allowing the bisphenol A adsorbed to Fe3O4@mSiO2@DPDES to be trivially separated from aqueous solutions with a magnet. Desorption of the adsorbed bisphenol A in aqueous solution occurred at pH 2, allowing an impressive 95% recovery rate. The durability of the Fe3O4@mSiO2@DPDES adsorbent was tested by repeated separation of bisphenol A from an aqueous solution, with the recovery efficiency remaining greater than 85% after five cycles.
Guangyu Wang,Yongsheng Du,Jie Ma,Hongxia Zhang,Shunli Ouyang,Leibo Deng,Hua Chen,Ming Zhao 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
CaO-MgO-Al2O3-SiO2 glass-ceramics were successfully prepared using Baotou Steel BFS as the raw materials, choosing Fe2O3and Cr2O3 as nucleating agents. This paper focused on analyzing the combined effect of Fe2O3 and Cr2O3 on the structure andproperties of the glass-ceramics. Experimental results showed that the crystallization mechanism of glass-ceramics convertedsurface crystallization into bulk crystallization and the main crystalline phase of glass-ceramics changed gradually from augiteto diopside with the decrease of Fe2O3/Cr2O3 ratios. Therefore, an appropriate ratio of Fe2O3/Cr2O3 can act as nuclei forcrystallization of augite with integrated interlocking crystal structure and the physicochemical properties of glass-ceramic canbe improved. Consequently, the fracture mode of glass-ceramic was changed from intercrystalline to mixed transcrystalline/intercrystalline and therefore the average crack length can be shortened. Glass-ceramic with Fe2O3/Cr2O3 ratio of 1 had a highbending strength of 138.93 MPa, Vickers hardness of 7.51 GPa and acid resistance of 97.75%.
Zhaoyue Lü,Zhenbo Deng,Zheng Chen,Hailiang Du,Ye Zou,Denghui Xu,Yongsheng Wang 한국물리학회 2011 Current Applied Physics Vol.11 No.3
A series of small molecular organic light-emitting diodes (OLEDs) based on tris (8-hydroxyquinoline)aluminum (Alq_3) was fabricated by varying thicknesses and positions of cesium chloride (CsCl) layer inside Alq_3 layer. Both luminance and efficiency are enhanced due to the improvement of electron injection when a CsCl layer was deposited between Alq3 and aluminum (Al). For the insertion of the CsCl layer at the 10 nm position inside Alq3 layer away from Al cathode, the enhanced current density and luminance are attributed to the reaction between diffused Al and Cs. And the efficiency and luminance are enhanced due to the trap sites induced by the CsCl layer at the distance of 20 and 30 nm away from the Al cathode. The current density and luminance of devices, in which various thicknesses of CsCl layer was inserted at 20 nm position inside Alq3 layer away from the Al cathode, is affected by both hole trapped and insulating layer effects.
Preparation of decorative slag glass-ceramics and research on the solidification of heavy metals
Yang Tang,Xiaodong Hao,Zhenxiang Fang,Xinyu Bai,Guangyu Wang,Hongxia Zhang,Leibo Deng,Hua Chen,Ming Zhao,Yongsheng Du 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
Glass-ceramics with different CuO additions were prepared with Fe2O3 and Cr2O3 as composite nucleating agents, rare earthcontainingblast furnace slag (REBFS) as the main raw material. The existence state and stability of heavy metals Cu, Mn andCr in glass-ceramics were investigated. The results showed that Cr ions contributed to the generation of spinel phase, whileCu ions and Mn ions can enter the spinel crystal and exist stably, which indicated that there was a synergistic solidificationof Cu, Mn and Cr. The depolymerization effect of the copper ions contributed to the transformation of the crystal morphologyfrom dendrites to spherulites. Moreover, the increase in CuO contents promoted glass-ceramics from green to copper red. Based on the leaching experimental data analysis of heavy metals in glass-ceramics, the leaching concentration of heavy metalsCu, Cr and Mn were much lower than the standard leaching toxicity limit of hazardous waste (GB5085.3–2007, China). Theresults showed that the conversion of REBFS into environmentally friendly glass-ceramics can realize solid waste resourceutilization.