Papers by Author: Ling Ke Zeng

Abstract: In the last decade, The government and scientific researchers have payed a lot of attention to waste slag of aluminum factory . Many scholars have done a great deal of research and put forward many valuable resource recycling methods,Especially in ceramics field. This paper has reviewed the aluminum slag application ways that researched by our team and some other related scholars,and mainly overviews the application in ceramic filed.

Abstract: This article simulated fuzzy control system by using MATLAB and compared the normal fuzzy control system with the fuzzy control system which has an integrator. Further more, the influence of quantize factors, proportional factors and integral constants on system was studied. The simulation results show that static error always exists in normal fuzzy control systems and proportional factors influence the stability of the system greatly. Put an integrator into a fuzzy control system, and static error can be eliminated and the system stability can be improved. The conclusion of simulation and practical experience, use fuzzy control system with integrator in reality. It can get good results.

Abstract: In this paper, A1₄SiC₄ was synthesized by using flint, aluminum and carbon black as raw materials，and they mass ratio was 28:50:22. The samples were fired at 1500°C、1600°C and 1700°C in an argon atmosphere. The phase compositions were determined by X-ray diffraction (XRD), the microstructures were examined by scanning electron microscope (SEM) and the elemental and quantitative compositions were determined by the energy dispersive X-ray spectroscopy (EDX). The results showed that the flint reacted with the carbon black, and produced Al₂O₃ and SiC firstly; meanwhile Al₄C₃ as intermediate product formed by the reaction between Al and C. Then a certain Al4C3 reacted with SiC, and produced A1₄SiC₄; most Al₄C₃ reacted with the Al₂O₃, and produced Al₄O₄C at higher temperature. Subsequently, the Al₄O₄C and the SiC reacted with carbon black, and produced A1₄SiC₄. The formed quantity of A1₄SiC₄ increased as the heating temperature was raised, and crystal structure was the flake structure of 1-2μm thickness and about 10μm length. The formation mechanism of A1₄SiC₄ was also discussed.

Abstract: Polycrystalline Ca_3-xMg_xCo₄O₉(x=0-0.3)ceramics were prepared by the sol–gel method combined with the ordinary pressing sintering and the thermoelectric properties were measured from room temperature to 673 K. The substitution of Mg²⁺ for Ca²⁺ had a greater impact on the thermoelectric properties of Ca₃Co₄O₉. The electrical conductivity and the thermal conductivity reduced significantly with increasing Mg content, and the Seebeck coefficient increased simultaneously. The influence of Mg doping on the thermal conductivity is mainly embodied in the lattice thermal conductivity of Ca₃Co₄O₉. The lattice thermal conductivity showed a significant change with the increase of the dopant content, while the carrier thermal conductivity had no obvious change with the doping increasing. These results indicated that the thermoelectric properties of the material could be optimized remarkably with the substitution of Mg. The figure of merit Z reached 1.08×10^-4 K^-1 at 573 K for the sample of Ca_2.8Mg_0.2Co₄O₉.

Abstract: Polycrystalline Ca_3-xMg_xCo₄O₉（x=0-0.3）ceramics were prepared by the sol–gel method combined with the ordinary pressing sintering and the thermal conductivities were measured from room temperature to 673 K. The influence of Mg²⁺ substitution for Ca²⁺ on the thermal conductivities of Ca₃Co₄O₉ ceramics was investigated systematically. The influence of Mg doping on the thermal conductivities is mainly embodied in the lattice thermal conductivities, which shows a significant decrease with the increase of the dopant content for the samples with x ≤ 0.2, while the carrier thermal conductivity had no obvious change with Mg doping increasing. These results indicated that the thermal conductivities of the material could be reduced remarkably with the substitution of Mg from 1.427 W/m·K to 0.731 W/m·K at 573 K with x = 0.2.

Abstract: This work aims preparation cheaper and high performance reticulate porous ceramic (RPC) for organism carrier. The RPC were made from clay by polymeric foam replication process. The X-ray diffraction (XRD) phase analysis indicates that the RPC mainly consist of mullite when sintered at 1350°C. The surface status of different component RPC was observed under scanning electron microscopy (SEM). The bio-film properties of different component and different pore size RPC were evaluated by the removal rates of COD_Cr and NH₃-N. The results show that the RPC had high effectiveness for microorganisms’ adsorption, the removal rates of COD_Cr and NH₃-N are all reach to 90%, and the bio-film effect is related to porosity, pore size and surface status of the RPC, but the porosity and pore size play more important role than the surface status of these carriers in bio-film process, the RPC carriers with more porosity and suitable pore size achieve better sewage treatment effect.

Abstract: Silica alcogels were prepared by hydrolysis with hydrochloric acid and condensation with NH₄OH of ethanol diluted tetraethylorthosilicate (TEOS) precursor and trimethylchlorosilane and hexane as surface modifying agent. The physical properties such as density, appearance, hydrophobicity, surface area, pore size distribution and thermal stability were measured. It was found that the physical and hydrophobic properties of the silica aerogels depend on the TMCS/hexane (V) volume ratio. The density decreased with increase of V, and the aerogels are more hydrophobic as V=3%. The aerogels were thermally stable up to a temperature of 350 °C, and the aerogel prepared has a high surface area and large pore volume.

Abstract: Data processing system on analysis of variance is developed by using Visual Basic. In this document, it introduced conception and functions about analysis of variance in brief, and explained the design of data processing system on analysis of variance in detail. Further more, we evaluated the performance of data processing system. The result indicated that the system has excellent performance and it is useful in the production and experiment.

Abstract: This document expands on the entire developing course of hospital ward integrated management information system. At first, it introduces the state of the art of domestic and abroad, develops background and the main research contents. Then, it analyses the designing and implementation of the system, and expands on the related technology used in the system.

Abstract: According to the similarity of the infiltration continuous equation and the thermal conductivity differential equations, the infiltration model of molten salt to fiber porous ceramic is designed by using Fluent software. The results can reflect the actual process of melting infiltration. Furthermore, the influences of different infiltration ways on infiltration process, with the same volume but different radius pillar, are simulated. It is found that infiltration time can be shortened for pillar fibers porous ceramics with same volume. When increasing the radius, horizontal infiltration is superior to vertical infiltration for pillar fibers porous ceramics when <1 and vice versa.