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

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 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 Shandong key laboratory of Engineering Ceramics Shandong University Jinan China School of materials Ocean University of China Qingdao China state key laboratory of advanced technology for materials synthesis and processing Wuhan University of Science and Technology Wuhan 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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XPS Analysis of Ni and Oxygen in Single-Sintered SrTiO_3 Multifunction Ceramic

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Journal of materials science & technology 2001年第5期17卷 535-537页

作者： Qing XU, Wen CHEN and Runzhang YUAN state key laboratory of advanced technology for materials synthesis and processing, wuhan university of technology, wuhan 430070, china wuhan Univ. of Technol. Wuhan 430070 China

XPS analyses have been performed to investigate the chemical conditions of Ni and oxygen on grain surfaces in single-sintered SrTiO3 capacitor-varistor ceramic doped with Nb2O5 and NiO. It is ascertained that Ni is in form of Ni2+ ions, which substitute for Ti4+ ions on grain surfaces during the oxidizing annealing. Moreover, it is confirmed that three kinds of chemically adsorbed oxygen such as O2-, O- and O-2(-) are formed on grain surfaces. It is proposed that these behaviors contribute greatly to the generation of multiple types of grain boundary acceptor states in the ceramic.

关键词： XPS Analysis of Ni and Oxygen in Single-Sintered SrTiO3 Multifunction Ceramic Ni

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Mold Filling Analysis in Vacuum Infusion Molding Process Based on a High-Permeable Medium

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Journal of materials science & technology 2003年第5期19卷 467-471页

作者： Yingdan ZHU, Hua TAN and Jihui WANGstate key laboratory of advanced technology for materials synthesis and processing, wuhan university of technology, wuhan 430070, china state key laboratory of advanced technology for materials synthesis and processing Wuhan University of Technology Wuhan 430070 China

The objective of this paper is to understand the flow mechanism through visualization experiments and discuss theinfluence of process parameters on mold filling process. A 2D leakage flow model is developed to simulat... 详细信息

关键词： Vacuum infusion molding process (VIMP) High-permeable medium Mold filling Simulation

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Research on Ultrafine Tungsten Carbide-Cobalt(WC-Co) Cemented Carbide Rods of Miniature Drills for Highly Integrated Printed Circuit Board(PCB)

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Journal of materials science & technology 2005年第3期21卷 353-356页

作者： Xiaoliang SHI, Gangqin SHAO, Xinglong DUAN and Runzhang YUAN state key laboratory of advanced technology for materials synthesis & processing, wuhan university of technology, wuhan 430070, china Lab. of advanced technology for materials synthesis and processing Wuhan University of Technology Wuhan 430070 China

Nanocrystalline tungsten carbide-cobalt (WC-Co) composite powders produced through spray thermal decomposition-continuous reduction and carburization technology were used to prepare φ3.25 mm×38 mm ultrafine tungsten carbide-cobalt (WC-Co) cemented carbide rods through vacuum sintering plus sinterhip technology. The microstructure, Vickers hardness, density and Rockwell A hardness (HRA), transverse rupture strength (TRS), saturated magnetization and coercivity force were tested. The results show that the average grain size of the sintering body prepared through vacuum sintering plus sinterhip technology was 430 nm; transverse rupture strength (TRS) was 3850 MPa; Vickers hardness was 1890 and Rockwell A hardness of sintering body was 93. High strength and high hardness ultrafine WC-Co cemented carbide rods used to manufacture printed circuit board (PCB) drills were obtained.

关键词： Nanocrystalline Composite powder Cemented carbide Rods

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The Impact of Annealing Temperature on the Optical Performance of Cr-Cr_2O_3 Produced by Plasma Spraying as Solar Energy Selective Absorber Coating

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稀有金属材料与工程 2012年第S1期41卷 315-318页

作者： Gong Dianqing,Cheng Xudong,Wang Ke state key laboratory of advanced technology for materials synthesis and processing,wuhan university of technology,wuhan 430070,china wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China

A series of selective solar absorber coatings of Cr-Cr2O3 were deposited in different content on stainless steel by plasma *** samples were annealed at different *** optical performance(both the solar absorptance and the thermal emittance)were studied by *** surface morphology,the structure and the surface roughness were investigated by scanning electron microscopy(SEM),X-ray diffraction(XRD),and roughmeter *** results show that,as the content of Cr increased,the solar absorptance(α)decreased greatly,from 0.91 to ***,the thermal emittance(ε) decreased more greatly,from 0.86 to about *** ratio between the solar absorptance and the thermal emittance increased from 1.06 to *** had a great impact on the optical *** temperature is an important *** its influence was a little *** pure Cr coating,annealing at 500℃ was a perfect chosen,where the ratio between the solar absorptance and the thermal emittance was highest of 1.46.

关键词： optical performance plasma spraying solar energy selective absorber coating

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Welding TiB_2 Ceramies and Metai Mo with Combustion Reaction technology

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Journal of materials science & technology 2004年第6期20卷 763-766页

作者： Daihua HE, Zhengyi FU and Qingjie ZHANGstate key Lab. of advanced technology for materials synthesis and processing, wuhan university of technology, wuhan 430070, china Lab. of Adv. Technol. for Mat. Proc. Wuhan Univ. of Technol. Wuhan 430070 China

Combustion reaction welding, one promising method to weld ceramies and metals, was used to weld TiB2 and Mo. The results showed that the reacted products through combustion reaction were TiB2 and MoB when the Mo contents in reactants were 20 wt pct and 40 wt pct while there was Mo besides MoB and TiB2 when there were 60 wt pct and 80 wt pct Mo in reactants. Diffusion of elements occurred at the interfaces of the two substrates. The interfaces between the reacted and the two substrates were indistinct after being welded. The welding temperature strongly affected properties of the samples. The value of bending strength of the sample with 80 wt pct Mo in reactant welded at 1500℃ was the highest, 368.52 MPa. The highest value of shear strength among all the samples was that of the one with 40 wt pct Mo in reactant vvelded at 1500℃, 50.97 MPa.

关键词： Combustion reaction welding TiB_2 Mo

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Fabrication of Titanium Diboride-Cu Composite by Self-High Temperature synthesis plus Quick Press

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Journal of materials science & technology 2005年第6期21卷 841-844页

作者： Jinyong ZHANG+, Zhengyi FU and Weimin WANGstate key Lab of advanced technology for materials synthesis and processing, wuhan university of technology, wuhan 430070, china state key Lab. of advanced technology for materials synthesis and processing Wuhan University of Technology Wuhan 430070 China

Titanium diboride based composites, good candidates for contact materials, have high hardness, Young＇s modulus, high temperature stability, and excellent electrical, thermal conductivity. However a good interface of TiB2/Cu is very difficult to achieve for oxidation of TiB2. To avoid this oxidation behavior, the in situ combusting synthesis technology, SHS, was used to prepare TiB2/Cu composite. The characters of Ti-B-xCu SHS were studied in detail, such as combustion temperature, products phases and grain size. Based on the experimental results a proper technology way of self-high temperature synthesis plus quick press （SHS/QP） was determined and compact TiB2/Cu composites with relative density over than 97 pct of the theoretical were fabricated by this method. The properties and microstructures of these TiB2 based composites were also investigated.

关键词： Self-high temperature synthesis (SHS) TiB2 Composite

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Grain Size and Wettability of TiO_2/SiO_2 Photocatalytic Composite Thin Filing

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Rare Metals 2001年第2期20卷 81-86页

作者： Jiaguo Yu, Xiujian Zhao, Jimmy C Yu, Jun Lin (state key laboratory of advanced technology for materials synthesis and processing, wuhan university of technology, wuhan 430070, china Deportment of Chemised The Chinese university of Hong Kong, Hong Kong, 武汉工业大学材料复合新技术国家重点实验室湖北武汉 430070 香港大学化学系香港 430070

The uniform transparent TiO2/SiO2 photocatalytic composite thin films are prepared by sol-gel method on the soda lime glass substrates, and characterized by UV-visible spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), BET surface area, FTIR spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that the addition of SiO2 to TiO2 thin films can suppress the grain growth of TiO2 crystal, increase the hydroxyl content on the surface of TiO2 films, lower the contact angle for water on TiO, films and enhance the hydrophilic property of TiO2 films. The super-hydrophilic TiO2/SiO2 photocatalytic composite thin films with the contact angle of 0((o) under bar) are obtained by the addition of 10%-20% SiO2 in mole fraction.

关键词： sol-gel method TiO2/SiO2 photocatalytic composite thin films grain size wettability

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Long-period Gratings in-situ Sensing for Flow Monitoring in Liquid Composite Molding

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Journal of materials science & technology 2005年第2期21卷 234-238页

作者： Yingdan ZHU, Chang WANG, Jihui WANG, Wei HE and Guoqiang GAO state key laboratory of advanced technology for materials synthesis and Proceeding, wuhan university of technology, wuhan 430070, china Mat. synthesis and Proceeding Lab. Wuhan Univ. of Technol. Wuhan 430070 China

Liquid composite moulding (LCM) processes are used to manufacture high quality and complex-shaped composite parts in the automotive, marine, aerospace and civil industries. On-line sensing plays an important role in controlling the quality of the final product in the LCM manufacturing environment. The long-period fiber grating (LPG) technology, a new real-time fiber optic sensor system, was developed to monitor the flow front progression. The sensor operation and characterization under various process conditions were discussed in detail. The experimental results showed that LPG sensors were robust and reliable to detect the arrival of resin at pre-selected locations in structures with low-medium fiber volume fraction; however were limited at different depths in structures with high fiber volume fraction.

关键词： Liquid composite moulding Flow monitoring Long-period grating

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Nafion/Silicon Oxide Composite Membrane for High Temperature Proton Exchange Membrane Fuel Cell

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Journal of wuhan university of technology(materials science) 2007年第3期22卷 478-481页

作者：余军 state key laboratory of advanced technology for materials synthesis and processing Wuhan University of Technology

Nafion/Silicon oxide composite membranes were produced via in situ sol-gel reaction of tetraethylorthosilicate （TEOS） in Nafion membranes. The physicochemical properties of the membranes were studied by FT-IR,TG-DSC and tensile strength. The results show that the silicon oxide is compatible with the Nation membrane and the thermo stability of Nation/Silicon oxide composite membrane is higher than that of Nation membrane. Furthermore, the tensile strength of Nation/Silicon oxide composite membrane is similar to that of the Nation membrane. The proton conductivity of Nation/Silicon oxide composite membrane is higher than that of Nation membrane. When the Nation/Silicon oxide composite membrane was employed as an electrolyte in H2/O2 PEMFC, a higher current density value （1 000 mA/cm^2 at 0.38 V） than that of the Nafion1135 membrane （100 mA/cm^2 at 0.04 V） was obtained at 110 ℃.

关键词： PEMFC composite membrane silicon oxide high temperature

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