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作者： Zhang, J.Y. Fu, Z.Y. Wang, W.M. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

MoSi2 is one of the few intermetallics to have potential for farther systems. However, the use of MoSi2 has been hindered due to the brittle nature of the material at low temperatures, inadequate creep resistance at high temperatures, accelerated (pest) oxidation at temperatures between 450-550°C. In this investigation Mo(Al,Si2)/Ti 3SiC2 composites has been prepared by reaction hot-pressing from Mo, Si, SiC, Ti, Al powder mixture under different temperatures. XRD results show that the main products are Mo(Si,Al)2 and Ti3SiC2. Part of TiC and SiC also appeared at low treating temperature. With the treating temperature increasing SiC disappeared. No evidence show lattice change of Mo(Si,Al)2. It must be the results of sufficient Al added. The electrical conductivity properties were also investigated. Samples treating under different temperatures showed different changes. Samples under high treating temperature showed a near linear change ranging from 27∼800°C and Samples under low treating temperature showed a nonlinear change.

关键词： Intermetallics

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Sintering behavior of Fe-Si composite powder by DPR technique

Sintering behavior of Fe-Si composite powder by DPR techniqu...

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作者： Shen, Q. Zhou, Y. Li, J.G. Yuan, W.J. Zhang, L.M. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The reaction mechanism of silicon and iron composite powders was clarified during the fabrication of high silicon iron sheet with the Si-content of 6.5wt% by Direct Powder Rolling (DPR) technique. The changes of phase composition and structure evolvement were mainly studied, It is found that a local graded structure, Fe-Fe(Si)-Fe3Si(Si)-Si, forms when sintering at 950-10007deg;C, which plays an important role in the DPR process. Fe 3Si(Si) phase keeps higher content of Si, and Fe(Si) phase remains the state with much lower Si-content, thus provides good mechanical proprieties of rolling and cutting. Then, the subsequent sintering at about 1200C improves the density and makes the distribution of Si homogeneous in the final high silicon iron sheets.

关键词： Powders

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Thermal reaction and phase evolution of APP/Al(OH)3/α-SiO2 6th

Thermal reaction and phase evolution of APP/Al(OH)3/α-SiO2

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6th Annual Meeting on Testing and Evaluation of advanced materials, TEIM 2015

作者： Hu, Sheng Sun, Wanwan Chen, Fei Li, Junguo Shen, Qiang Zhang, Lianmeng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783038357278

The thermal reaction and phase evolution of APP/Al(OH)3/α-SiO2 with different mass ratios during heating were studied by TG, FTIR, XRD and SEM, respectively. When the temperature is not higher than 300°C, mass ratio of mAPP:mAl(OH)3:mSiO2 has no effect on the phase evolution of APP/Al(OH)3/α-SiO2 and the main interaction product is AlNH4HP3O10. APP/Al(OH)3/α-SiO2 with lower content of APP, appears larger weight loss rate due to the thermal decomposition of Al(OH)3. The thermal reaction of APP/Al(OH)3/α-SiO2 is significantly influenced by the APP content as temperature rises to higher than 300°C. The decomposition products of APP can chemically interact with Al(OH)3 to generate Al2P6O18 and Al(PO3)3 during 600°C ∼900°C. When the content of APP increases, much more APP can chemically react with Al(OH)3 and also with part of α-SiO2 to generate SiP2O7. SEM shows the relatively dense microstructure due to micro-bridges of liquid phase with phosphate content increasing. © 2016 Trans Tech Publications, Switzerland.

关键词： Silica

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Effect of Sn on the sintering of Fe-Si alloys

Effect of Sn on the sintering of Fe-Si alloys

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作者： Li, J.G. Yuan, W.J. Zhou, Y. Zhang, L.M. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

In this work, Fe and Si powders were used to fabricate 6.5% Si silicon steel. The mixing powder was rolled into strip and then treated at 900°C in Ar. Sn was added into the mixing powder to investigate the effect of Sn on the sintering. The density, composition, and structure were examined. The results show that Fe almost does not react with Si at 900°C But with the addition of Sn, Fe reacts with Si to produce Fe3Si at 900°C Increasing the amount of Sn accelerates this reaction. When the amount of Sn addition is excessive, there will leave many pores in the alloy because the reaction rate is too fast to shrink. The proper amount of Sn addition can decrease the sintering temperature and shorten the sintering time.

关键词： Iron alloys

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Control of preferential orientation of La1-xSrxMnO3 thin films by pulsed laser deposition 9th

Control of preferential orientation of La1-xSrxMnO3 thin fil...

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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Zhu, Yaxiang Wang, Chuanbin Shen, Qiang Zhang, Lianmeng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783035710656

La1-xSrxMnO3 (LSMO) thin films were grown on (100)- and (110)-oriented MgO substrates by pulsed laser deposition, so as to control the preferential orientation of the films. At the optimum deposition temperature (Td=923K), LSMO thin films with a dense texture and a smooth surface were prepared. The XRD patterns and X-ray pole figures indicated that the LSMO thin films were epitaxially grown on MgO substrates, due to the small lattice mismatch between the films and substrates. The possible orientation relationships were found to be LSMO (100)[010] // MgO (100)[010] and LSMO (110) [110] // MgO (110) [110], as for the (100) and (110) MgO substrates, respectively. © 2016 Trans Tech Publications, Switzerland.

关键词： Pulsed laser deposition

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Optical property of spark plasma sintered translucent AlN ceramics

Optical property of spark plasma sintered translucent AlN ce...

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作者： Xiong, Y. Fu, Z.Y. Wang, H. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Translucent AlN ceramics were fabricated using spark plasma sintering (SPS) technique with 3wt% CaF2 as sintering additive. The samples achieved 52.4% maximum transmittance in medium IR region after 10 min holding time by spark plasma sintering at 1800°C and 30 MPa pressure in N2. The results from XRD, SEM, TEM and EDX showed that the sintered bodies were densely compacted and highly pure with fine grain size and uniform microstructures. No secondary phases were observed at the grain boundaries and triple grain junctions, which guaranteed good optical property of the sintered bodies.

关键词： Ceramic materials

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Formation of regular hexagonal dislocation network in chemical-furnace sintered alumina

Formation of regular hexagonal dislocation network in chemic...

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作者： Meng, Fancheng Fu, Zhengyi Wang, Weimin Zhang, Qingjie State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Polycrystalline alumina was prepared at high temperature and high pressure from combustion reaction plus mechanical pressure. The defect structure in the sintered alumina was investigated by transmission electron microscopy and a regular hexagonal dislocation network was found. Diffraction contrast technique revealed that the regular hexagonal network on the (0001) plane was composed of three dislocations with Burgers vectors: 1/3[12¯10], 1/3[2¯110] and 1/3[112¯0]. The formation process of dislocation network was discussed.

关键词： Polycrystalline materials

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Chemistry purification of titanium diboride powder synthesised by combustion synthesis processes

Chemistry purification of titanium diboride powder synthesis...

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6th Pacific Rim Conference on Ceramic and Glass technology, PacRim6

作者： Weimin, Wang Zhengyi, Fu Hao, Wang State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Combustion synthesis method with reductive process was used to synthesize TiB2 powder from TiO2 - B2O3 - Mg system. Main impurity phase can be cleaned out by acid washing treatment. The influences of acid washing conditions (acid concentration, treatment time, treatment temperature and so on) on the purity of TiB2 powder were studied. Results showed that acid treatment temperature and amount of excessive acid were the main factors that effected purity of TiB2 powder. With increase of acid treatment temperature and amount of excessive acid, purity of TiB2 powder increased continuously. The analysis of thermodynamics and kinetics showed that the increase of acid treatment temperature could increase chemistry reaction speed constant (K), and accelerate acid washing processing. Diffusion mechanism controlled mainly acid treatment reaction.

关键词： Titanium compounds

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Photocatalytic Activity of Hierarchical Flower-Like TiO_(2) Superstructures with Dominant {001} Facets

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催化学报 2011年第4期32卷 525-531页

作者： XIANG Quanjun YU Jiaguo State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeLChina

The fabrication of well defined hierarchical structures of anatase TiO_(2) with a high percentage of reactive facets is of great importance and *** flower-like TiO_(2) superstructures(HFTS)self-assembled from anatase TiO_(2) nanosheets with exposed{001}facets(up to 87%)were synthesized by a simple alcohothermal strategy in a HF-H_(2)O-C_(2)H_(5)OH mixed solution using titanate nanotubes as *** samples were characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,and N2 adsorption-desorption *** photocatalytic activity was evaluated by the photocatalytic oxidation decomposition of acetone in air and methyl orange in aqueous solution under UV *** photocatalytic activity of HFTS was much higher than that of commercial Degussa P25 and tabular-shaped anatase TiO_(2) obtained using pure water as the synthesis *** enhancement in photocatalytic activity was related to several factors,including the hierarchically porous structure,exposed{001}facets,and increased light harvesting *** HFTS was also of interest for use in solar cells,photocatalytic H_(2) production,optoelectronic devices,sensors,and catalysis.

关键词： titanium dioxide {001}facet hierarchical flower-like titanium dioxide superstructure photocatalytic activity acetone methyl orange

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Revisiting Water Oxidation Reaction with Micro Bubble Lithography (MBL) Printed ZIF-67 MOF Electrocatalysts

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Small Methods 2025年 e2401627页

作者： Manna, Khokan Ranjan, Anand Dev Singh, Himanshi Sen, Rakesh Verpoort, Francis Banerjee, Abhik Banerjee, Ayan Roy, Soumyajit EFAML Materials Science Center Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata741246 India Light Matter Lab Department of Physical Sciences Indian Institute of Science Education and Research Kolkata Mohanpur741246 India TCG Centres for Research and Education in Science and Technology Sector V Salt Lake Kolkata700091 India State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China 6 Miklukho-Maklaya Str. Moscow117198 Russia National Research Tomsk Polytechnic University Lenin Avenue 30 Tomsk634050 Russia

Microbubble-based micro-lithographic techniques have developed rapidly over the last ten years and are capable of reproducibly patterning a wide variety of soft materials and colloids, including polymers, metals, and proteins. Zeolitic imidazolate framework (ZIF) materials have attracted a great deal of research and application interest in the field of materials science because of their chemical and thermal stabilities. Furthermore, ZIF-67 has demonstrated significant potential for applications in gas adsorption, molecule separation, electrochemistry, and catalysis, which when converted into "lab.on-a-chip" platforms might produce remarkable and diverse application-oriented outcomes. This is due to their highly adjustable nanostructures. Using Co(OAc)2.4H2O and Co(NO3)2.6H2O as the metal ion sources and 2-methylimidazole as the ligand, To design ZIF-67 (composed of Co2+ ions and imidazolate ligands) is attempted. Inspired by previous results, the Micro-Bubble Lithography (MBL) approach is used to successfully demonstrate an instantaneous in situ green synthesis and micro-patterning of ZIF-67 MOFs in this work. With reasonable stability and an over-potential of 440 mV, these micro-patterns are used as microelectrodes for the electrocatalytic oxygen evolution reaction (OER) in media having different pH. © 2025 Wiley-VCH GmbH.

关键词： Green synthesis

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