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第五届宝钢学术年会

作者： FEI Junjie REN Anchao WANG Weimin JI Yu ZHOU Jianhua ZHU Min Research and Development Center of Wuhan Iron and Steel (Group) Corp. Wuhan 430080HubeiChina State Key Lab of Advanced Material Synthesis and ProcessingWuhan University of TechnologyWuhan 430070HubeiChina

Titanium diboride ( TiB2) have been widely studied as one of the most promising engineering ceramics and refractory material because of its excellent physical and chemical properties such as high melting point,high modulus,low density and excellent electric *** addition,TiB2 ceramics exhibit unique properties of good wettability with liquid aluminum and good corrosion resistance,such properties make the titanium diboride and carbon ( TiB2/C) composites have been considered as the ideal cathode materials for Hall- Heroult cells to replace the traditional carbon cathode *** combined with carbon,the titanium diboride and carbon ( TiB2/C) composites have many *** one hand,the TiB2/C composites have good thermal shock resistance duo to the low thermal expansion coefficient and high thermal conductivity of TiB2 and *** the other hand,carbon shows a good lubricity,so the TiB2/C composites exhibit good machinability and wear resistance ability,moreover,the carbon can eliminate the harmful effect of oxide impurities on the densification of TiB2 *** diboride-carbon ( TiB2/C ) refractory composites were prepared by hot pressing *** effects of the TiB2 content and hot pressing parameters on the mechanical properties and microstructures of composites were *** point bending test method was used to measure the flexural strength of TiB2/C composites,fracture toughness was evaluated by the single edge -notched bending test ( SENB),scanning electronic microscopy ( SEM,JSM-S3400) and X-ray diffraction were used to evaluate the microstructure of sintered materials on fracture surface and polished *** bulk density of the TiB2/C composites was measured by the Archimedes' s *** TiB2 content and sintering parameters were found to have significant effect not only on the microstructures of composites,but also on the densification and mechanical *** experimental results show that the i

关键词： TiB2/C refractory composites hot pressing mechanical properties microstructures

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Fabrication of W/Cu FGM By Aqueous Tape Casting

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Journal of Physics: Conference Series 2013年第1期419卷

作者： Shulong Liu Qiang Shen Guoqiang Luo Meijuan Li Lianmeng Zhang Country State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P.R.China

Tungsten Copper-based metals (W/Cu) were extensively used as electrical contact materials in switching systems for the electric power industry. In this paper, a novel investigation to prepare Tungsten Copper-based metal composite materials according to functionally graded material (FGM) concept and the method of tape casting was reported. Cu-coated W powders with different Cu weight fraction were synthesized via electricless plain in methanol-water solvent. The green tapes with different composition and thickness were laminated and then sintered to prepare W-Cu functionally graded materials. XRD, EDS, SEM and metallographic analyses were used to characterize the material microstructure and combination between different layers. The results showed that the Cu-coated W powders had grate compressibility leading to wettability of powders. The parallelism and flatness of intermediate layer were good and the combination was tight.

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Fabrication of Al-W Functionally Graded Impact material via Vacuum Hot-Pressing Sintering Method

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Journal of Physics: Conference Series 2013年第1期419卷

作者： Pingan Chen Guoqiang Luo Yinghu Liu Qiang Shen Lianmeng Zhang State Key Lab of Advanced Technnology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P.R.China

Dense graded material as a type of functionally graded material (FGM) changes its wave impedance gradually along the thickness direction. In this investigation, Al-W functionally graded material was fabricated via vacuum hot-pressing sintering method (VHPS). The results showed that densified Al-W composite was fabricated at 550°C-300MPa-120min which the relative density was higher than 98.5% without intermetallic compounds. The density graded material of Al-W FGM was attained at the optimized parameters which the component of Al was from 10% to 100%. The micro structure of Al-W FGM composite indicated that W particles in single-layer composite were distributed homogeneously. The density of each layer in Al-W FGM composite was consistent with the design value.

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Fabrication of Homogenous Dispersion TiB_2-Al_2O_3 Composites

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Journal of Wuhan University of technology(materials Science) 2011年第4期26卷 681-683页

作者：张金咏 State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

In order to get a homogenous mixture and compact of TiB2-Al2O3, hybridization as a surface modification method was used to prepare nano-scale Al2O3 coated TiB2 particles. PE-wax particles were first coated onto TiB2 particles by hybridization, and then the nano-scale Al2O3 particles were coated onto the surface of TiB2 coated by PE-wax particles again. SEM, TEM and EDS were used to characterize the microstructure of as-received core/shell particles and its compacts. The experimental results show that a particle-scale homogenous dispersion of TiB2 and Al2O3 can be formed not only in mixed powder but also in dewaxed compacts. The compacts then were sintered by gas-pressing sintering （GPS）. Finial products show improved mechanic properties comparing with reference samples fabricated by normal ways.

关键词： TiB2/Al2O3 hybridization dispersion

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Fabrication of translucent boron nitride dispersed polycrystalline silicon nitride ceramics

Fabrication of translucent boron nitride dispersed polycryst...

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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Joshi, B. Fu, Z. Niihara, K. Lee, S.W. Department of Metallurgy and Material Engineering Sunmoon University Korea Republic of State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea Republic of

Optical transparency was achieved at infrared region and overall translucent silicon nitride was fabricated using hot press sintering (HPS). The increase in h-BN content decreased the optical transparency. Microstructral observations shows that the optical, mechanical and tribological properties of BN dispersed polycrystalline Si3N4 ceramics were affected by the density, α:β-phase ratio and content of h-BN in sintered ceramics. The hot pressed samples were prepared from the mixture of α-Si3N4, AlN, MgO and h-BN at 1850°C. The composite contained from 0.25 to 2 mass % BN powder with sintering aids (9% AlN + 3% MgO). Maximum transmittance of 57% was achieved for 0.25 mass % BN doped Si3N4 ceramics. Fracture toughness was increased and wear volume and friction coefficient were decreased with increase in BN content.

关键词： III-V semiconductors

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Fine-structured TiO2 ceramic patterns on the ceramic surface fabricated by replication

Fine-structured TiO2 ceramic patterns on the ceramic surface...

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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Kim, H.D. Nakayama, T. Hong, B.J. Imaki, K. Yoshimura, T. Suzuki, T. Suematsu, H. Lee, S.W. Fu, Z. Niihara, K. Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka 940-2188 Japan Department of Physics and Electronics Graduate School of Engineering Osaka Prefecture University 1-1 Gakuencho Nakaku Sakai 599-8531 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Republic of State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The ability to fabricate high precision micro- to nanoscale structure in a wide variety of materials is of crucial importance for the advancement of microtechnology, nanotechnology and nanoscience. Also, the ability to create micrometer and sub-micrometer architecture for functional ceramics is a prerequisite of exploring the rich field of ceramic nanotechnology. In this work we fabricated three-dimensional oxide ceramic materials with fine-structure over multiple length scales by combining replication patterning technique, polyvinyl alcohol (PVA), oxide ceramic material (TiO2) nano-sized particles. Our study is based on the idea that PVA can be easily detached from a mold by peeling. We confirmed that micron and sub-micron-sized fine-structured oxide ceramic patterns containing nano-sized pores could be fabricated using this procedure. The results presented demonstrate the compositional and structural diversities that are possible with a facile approach and simple method.

关键词： Ceramic materials

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Fabrication of translucent boron nitride dispersed polycrystalline silicon nitride ceramics

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IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： B Joshi Z Fu K Niihara S W Lee Department of Metallurgy and Material Engineering Sunmoon University Korea State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea

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Optical, mechanical and tribological properties of Y2O3, Er2O3 and Nd2O3 doped polycrystalline silicon nitride ceramics

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IOP Conference Series: materials Science and Engineering 2011年第8期18卷

作者： Bhupendra Joshi Zhengyi Fu Koichi Niihara Soo W Lee Department of Metallurgy and Material Engineering Sunmoon University Korea State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea

Y2O3, Er2O3 and Nd2O3 doped polycrystalline silicon nitride ceramics were prepared by hot press sintering method at 1850°C and 30 MPa pressure. 1 wt.% of each rare earth oxides (REO) were sintered with 3 wt.% MgO, 9 wt.% AlN and 87 wt.% α-*** optical, mechanical and tribological properties of REO doped polycrystalline silicon nitride ceramics were investigated. Optical transmittance was measured in visible and near infrared region and found to be 54% transmittance for Y2O3 doped Si3N4 ceramics. β- phase transformation was suppressed with REO addition. High hardness and high fracture toughness were achieved by addition of REO. Adding REO shows good mechanical properties as high strength and toughness. Coefficient of friction of the REO doped silicon nitride ceramics was lower than that of without REO doped silicon nitride ceramics.

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Controlling Growth of ZnO Nanostructures Via A Solution Route

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Journal of Wuhan University of technology(materials Science) 2009年第2期24卷 249-253页

作者：贾铁昆 State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

A solution method was developed for fabricating ZnO nanostructures using （NH4）2CO3 as starting material SEM analysis shows that ZnO nanostructures exhibit nanorod, branch and flower-like morphologies. The crystal phase of as-synthesized products was characterized by X-ray diffraction （XRD）. The growth process, formation mechanism and optical property were also discussed by means of transmission electronic microscopy （TEM）, high resolution transmission microscopy （HRTEM） and photoluminescence （PL）. The growth direction of ZnO nanostructures was investigated based on the results of HRTEM. The PL spectrum shows two strong peaks （centered at around -387 and -470 nm） and a broad Deak （centered at around -580 nm）.

关键词： ZnO nanostructures pH solvent luminescence property

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Fine-structured TiO2 ceramic patterns on the ceramic surface fabricated by replication

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IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： H D Kim T Nakayama B J Hong K Imaki T Yoshimura T Suzuki H Suematsu S W Lee Z Fu K Niihara Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka 940-2188 Japan Department of Physics and Electronics Graduate School of Engineering Osaka Prefecture University 1-1 Gakuencho Nakaku Sakai 599-8531 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

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