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作者： Su, Y.L. Fu, Z.Y. Wang, W.M. Wang, H. Wang, Y.C. Zhang, J.Y. Ma, P.Y. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Radix salvia miltiorrhiza is a commonly used herbal medicine in China, and tanshinone IIA is one of the major active ingredients. Nano Radix salvia miltiorrhiza particles were successfully prepared by high speed centrifugal sheering (HSCS) technology, and the prepared nanoparticles suspension was subsequently spray-dried. The different properties of nano particles and raw powder were systematically studied by laser light scattering granulometric analyzer, TEM, SEM and FTIR. The extractive quantity of tanshinone IIA was determined by high-performance liquid chromatography (HPLC). The results illustrate that raw Radix salvia miltiorrhiza powder can be ultrafinely ground to nanosize within 50min, and the molecular structure of active ingredients doesn't change after being ground. Furthermore, the active ingredients can dissolve out directly and fully, and the extractive ratio of tanshinone IIA increases 28.6% by HSCS processing. It is valuable to combine nanotechnology and TCM to improve the bioavailab.lity and rapid releasing.

关键词： Ketones

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Effects of VC/Cr3C2 additions on microwave sintering properties of ultrafine WC-10Co hard alloys

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第12期29卷 49-51+62页

作者： Quan, Feng Zhou, Jian Liu, Wei-Bo Liu, Gui-Zhen State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Using the microwave sintering technology, the effects of VC/Cr3C2 additions on the microstructure and properties of the ultrafine WC-10Co alloys were investigated. Experimental results showed that ultrafine WC-10Co alloys with 0.6% additions had the best properties while the excessive grain growth inhibitors would decrease the properties of alloys. Moreover, with or without additions, WC-10Co alloys with finely uniform grained WC by microwave sintering could be obtained.

关键词： Cemented carbide Grain growth inhibitor Microwave sintering Superfine grain

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Reaction process of Al2(1-x)MgxTi1+xO 5 composite powder by chemical co-precipitation and subsequent sintering

Reaction process of Al2(1-x)MgxTi1+xO 5 composite powder by ...

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作者： Shen, Shang-Yue Yang, Rui Shen, Qiang Wang, Chuan-Bin Zhang, Lian-Meng School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China State Key Lab. of Advanced Technology for Materials Synthesis Processing Wuhan University of Technology Wuhan 430070 China

Al2(1-x)MgxTi1+xO5(x=0.05-0.3) composite powder was prepared by the method of chemical coprecipitation and subsequent sintering using TiCl5, MgCl2 and AlCl 3 solution as the raw materials, and ammonia and ammonium carbonate as the solvent. Thermal dynamics and kinetic dynamics analysis of the precursor during the heat treatment were explored in detail, and the reaction process of Al2(1-x)MgxTi1+xO5(x=0.3) composite powder was confirmed. Results show that, as the temperature increases MgO reacts with TiO2 of anatase phase to form MgTi2O5. At about 650°C, anatase transfers into rutile. Then MgTi2Os reacts with Al2O3 to produce MgAl2O4 at 900°C. When the temperature is above 1100°C, the desired Al 2(1-x)MgxTi1+xO5(x=0.3) composite powder is synthesized by the reaction of MgAl2O24, Al 2O3 and TiO2 of rutile phase.

关键词： Powders

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Poly(ethylene glycol)-coated carbonyl iron particles : Preparation and magnetorheological behavior

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10th International Conference on Electrorheological Fluids and Magnetorheological Suspensions, ERMR 2006

作者： Guan, Jian Guo Li, Li Chun State Key Laboratoly of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technolog Wuhan 430070 China

ISBN: (纸本)9812771190

A novel water-based magnetorheological (MR) suspension is based on the poly(ethy1ene glycol)-coated carbonyl iron particles, which is prepared by the co-sol-gel reaction using carbonyl iron particles as raw materials, and water without any other additive. The microshucture, anti-oxidation properties, magnetic and magnetorheological properties of the core-shell particles are characterized by scanning electronic microscopy, transmission electronic microscopy, Fourier transform infrared spectroscopy, thermogravimetric- differential thermal analysis, vibrating sample magnetometer, and ARES2000 rheometer, respectively. The results show that the as prepared particles have core-shell structure with a polymer shell of less than 100 nm and its anti-oxidation property is enhanced due to the compound coating. Both the core-shell particles and its based MR suspension exhibit excellent soft magnetic performance. The based MR suspension shows low zero viscosity and high MR effects, especially greatly improved anti-settlement and redispersibility. The phenomena are attributed to the hydrophilic thin shell of the core-shell particles.

关键词： Fourier transform infrared spectroscopy

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Liquid phase sintering of α-Si3N4 by spark plasma sintering

Liquid phase sintering of α-Si3N4 by spark plasma sintering

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作者： Yan, Fa-Qiang Chen, Fei Shen, Qiang Zhang, Lian-Meng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Shandong Research and Design Institute of Industrial Ceramics Zibo 255031 China

In this study, spark plasma sintering (SPS) was applied to prepare α-Si3N4 ceramics of different densities with magnesia, silicon dioxide, alumina as the sintering aids. The sintering behavior and liquid phase sintering (LPS) mechanism were discussed and the factors influencing the density of the prepared samples were analyzed. Microstructures of sintered samples were observed and the phase compositions were analyzed. The results showed that α-Si3N4 ceramics can be sintered by SPS based on the reaction among α-Si3N4 and sintering additives which lead to the liquid phase and the density can be well controlled from 2.48 to 3.09 g/cm3 while the content of the sintering aids changes from 10% to 28.5% and sintering temperature from 1400°C to 1500°C.

关键词： Silicon nitride

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Fast preparation and thermal transport property of TiCoSb-based half-Heusler compounds

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Chinese Physics B 2007年第11期16卷 3549-3552页

作者：谢文杰唐新峰张清杰 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

TiCoSb-based half-Heusler compounds with the substitution of Zr for Ti have been prepared quickly by combining high-energy ball milling method with spark plasma sintering technique, and their thermal transport properties have been investigated. With the increase of the concentration of Zr, the thermal conductivity of Til-xZrxCoSb compounds decreases significantly. Compared with the thermal conductivity of TiCoSb compound, that of Ti0.5Zr0.5CoSb decreases by 200% at 1000 K.

关键词： thermoelectric half-Heusler compounds thermal conductivity

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A harmonious unifying hybrid preferential model and its universal properties for complex dynamical networks

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Science China(Physics,Mechanics & Astronomy) 2007年第3期50卷 379-396页

作者： FANG JinQing BI Qiao LI Yong LU XinBiao LIU Qiang China Institute of Atomic Energy Beijing 102413China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Automation Shanghai Jiao Tong UniversityShanghai 200030China

To describe the real world which is a harmonious unification world with both de- terminism and randomness, we propose a harmonious unifying hybrid preferential model (HUHPM) of a certain class of complex dynamical networks. HUHPM is gov- erned only by the total hybrid ratio d/r according to the practical need. As some typical examples, the concepts and methods of the HUHPM are applied to the un-weighted BA model proposed by Barabási et al., the weighted BBV model pro- posed by Barat et al. and the weighted TDE model proposed by Wang et al. to get the so-called HUHPM-BA network, HUHPM-BBV network and HUHPM-TDE network. These HUHPM networks are investigated both analytically and numerically. It is found that the HUHPM reveals several universal properties, which more approach to the real-world networks for both un-weighted and weighted networks and have potential for applications.

关键词： harmonious unifying hybrid preferential model total hybrid ratio small world effect scale-free property un-weighted and weighted networks

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Spark plasma sintering of CBN-WC-10Co composites

Spark plasma sintering of CBN-WC-10Co composites

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作者： Shi, X.L. Shao, G.Q. Duan, X.L. Yuan, R.Zh. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

Nanocomposite WC-10Co powder produced by spray pyrolysis-continuous reduction & carbonization technology and cubic boron nitride (CBN) plated with titanium by vacuum vapor deposit were used, and this paper adopted spark plasma sintering (SPS) process to prepare CBN enhanced ultrafine WC-10Co cemented carbide cermets composite material. The microstructure and mechanical properties of CBN-WC-10Co composites were investigated. The results show that CBN-WC-10Co composites consolidated by spark plasma sintering can reach 95.0 % relative density, and transverse rupture strength (TRS) is 1050 MPa, the average grain size of cermets matrix is less than 420 nm, and CBN-WC-10Co composites with excellent properties are achieved. The CBN still remains very good crystal shape after 1240°C spark plasma sintering, and there is not obvious clearance between CBN plated with titanium and the cermets matrix, the coated titanium layer can not only improve the thermal stability of CBN, but also increase the properties of CBN-WC-10Co composites.

关键词： Composite materials

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Dominant point detecting based non-uniform B-spline approximation for grain contour

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Science China(Technological Sciences) 2007年第1期50卷 90-96页

作者： ZHAO XiuYang1, YIN YanSheng1,2 & YANG Bo3 1 Shandong key lab.ratory of Engineering Ceramics, Shandong University, Jinan 250061, China 2 School of materials, Ocean University of China, Qingdao 266003, China 3 state key lab.ratory of advanced technology for materials synthesis and processing, Wuhan University of Science and technology, Wuhan 430070, China 1. Shandong Key Laboratory of Engineering Ceramics Shandong University Jinan 250061 China 2. School of Materials Ocean University of China Qingdao 266003 China 3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Science and Technology Wuhan 430070 China

Three-dimension reconstruction from serial sections has been used in the last decade to obtain information concerning three-dimensional microstructural ge-ometry. One of the crucial steps of three-dimension reconstruction is getting compact and fairing grain contours. Based on the achievement of closed raw con-tours of ceramic composite grains by using wavelet and level set, an adaptive method is adopted for the polygonal approximation of the digitized raw contours. Instead of setting a fixed length of support region in advance, the novel method computes the suitable length of support region for each point to find the best es-timated curvature. The dominant points are identified as the points with local maximum estimated curvatures. Periodic closed B-spline approximation is used to find the most compact B-spline grain boundary contours within the given tolerance. A flexible distance selection approach is adopted to obtain the common knot vector of serial contours consisting of less knots that contain enough degrees of freedom to guarantee the existence of a B-spline curve interpolating each contour. Finally, a B-spline surface interpolating the serial contours is generated via B-spline surface skinning.

关键词： composite B-spline dominant points control points grain contour

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Time on the performance of ceramic ball grinding media prepared from refractory waste

Time on the performance of ceramic ball grinding media prepa...

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作者： Zhong, L.Y. Wu, B.L. Zhang, L.M. Song, J.G. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Lab. of Nonferrous Materials and New Processing Technology Guilin University of Technology Ministry of Education Guilin Guangxi 541004 China Department of Materials and Chemical Engineering Guilin University of Technology Guilin 541004 China

Aluminosilicate refractory waste was used to prepare high performance ceramic ball grinding media with 75% Al2O3. The influence of milling time on the particle size of raw materials, the sintering temperature, and performance of ceramic balls were studied. Results show that with increasing milling time the particle size of the raw materials decreased, resulting in a decrease of ceramic ball sintering temperature and an increase in wear resistance and volume density. The wear rate and volume density of balls prepared by milling the materials for 72 h were 0.01886 %/h and 3.374 g/cm 3, respectively.

关键词： Grinding (machining)

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