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Microstructure and Properties of A IN Coating/Graphite Fabricated via In-situ Reaction

Journal of Wuhan University of technology(materials Science) 2007年第4期22卷 718-721页

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

A novel method was used to fabricate AlN coating on graphite substrate. This approach included two steps： firstly, the emulsion composed of BN and anhydrous ethanol was sprayed on the surface of the graphite substrate; secondly, AlN coating was formed through the in-situ reaction of Al with the sprayed BN. The reaction was investigated by thermogravimetric-differential thermal analysis （TG-DTA）, and the phase composition in the synthetic process was characterized by X-ray diffraction （XRD）. Scanning electronic microscopy （SEM） was used to observe the morphology, and electron probe microanalysis （EPMA） was used to observe the distribution of the elements. The experimental results show that the AlN coating is dense and bonded with graphite tightly.

关键词： in-situ reaction AlN coating nitridation spray interface

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Effect of Zn on microstructure and mechanical properties of AL-zn-Mg-Cu-Zr alloy by powder metallurgy

Effect of Zn on microstructure and mechanical properties of ...

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2013 International Conference on advanced Technologies and Solutions in Industry, ICATSI 2013

作者： Wu, Chuan Dong Li, Cheng Zhang Fang, Pan Luo, Guo Qiang Shen, Qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Material Technology Institute of CVTC Dongfeng Motor CO.LTD Wuhan 430056 Hubei China

ISBN: (纸本)9783037857205

In this paper, full-density Al-Zn-Mg-Cu-Zr powder metallurgy(P/M) alloy is prepared by hot-press sintering in vacuum at 600°C. Experiments are conducted to evaluate the effects of Zn additive in the range of 7.2-8.4 wt.% on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Zr alloys. X-ray diffraction(XRD), scanning electron microstructure(SEM) and electron probe micro-analyzer (EPMA), and mechanical properties such as tensile strength are measured. The porosity decreases gradually with increasing of Zn and it achieves 0.01% with a density of 2.95 g/cm3 at 8.4% Zn. The tensile strength reaches the maximal value of 436 MPa at 8.4% Zn. © (2013) Trans Tech Publications, Switzerland.

关键词： Aluminum alloys

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Effect of annealing on laser-ablated *** 5+xO15+2x thin films

Effect of annealing on laser-ablated *** 5+xO15+2x thin film...

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作者： Zhan, Z.S. Gong, Y.S. Wang, C.B. Shen, Q. Zhang, L.M. State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China

In this study, K3Li2-xNb5+xO 15+2x (KLN) thin films were prepared by laser-ablated a sintered ceramic target. For an optimum deposition condition, in-situ post annealing method was employed on as-deposited films. XRD measurements showed that KLN films with (310) preferred orientation were obtained on fused quartz substrate. Surface morphology studies indicated mat in-situ post annealing could improve the surface quality of KLN thin films. The average transmittance of as-deposited and annealed films in the visible range was nearly 80% to 90%.

关键词： Thin films

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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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synthesis of a novel Al foam with a periodic architecture by introducing hollow Al tubes and Al/Mg powders

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Journal of materials Science & technology 2023年第17期148卷 105-115页

作者： Zhigang Xu Dayong Shen Kai Wang Peng He Jian Zhang Hao Zhang Peng Cao Shangyu Huang Jian Peng Qiang Shen Chuanbin Wang Lianmeng Zhang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Wuhan Second Ship Design and Research Institute Wuhan 430205China Department of Chemical and Materials Engineering University of AucklandPrivate Bag 92019Auckland 1142New Zealand

In this work,we synthesized a brand-new Al foam with a periodic structure via a simple powder metallurgical *** periodic architecture consists of both hierarchical porous and bi-directional composition-graded *** results show that the hierarchical porous material includes large pores on millimeter scale inheriting from the hollow structure of the Al tubes,and small pores on mi-crometer scale produced by the sintering of Al/Mg *** bi-directional Mg concentration-graded structure is formed in the tube walls due to the condensation of Mg vapor in the inner tube *** addition of Mg powders achieves excellent metallurgical bonding between the Al powders and the hollow tubes at 550℃.The plateau stress and energy absorption capacity of the Al foam in y-axis compression are significantly higher than that in the x-axis due to their anisotropic *** general,the Al foam with Mg addition presents the most superior compression performance,and we believe that our find-ings could open up a unique strategy for developing high-performance metallic foams with the periodic architecture involving both hierarchical porous and bi-directional graded structure.

关键词： Al foam Hollow Al tube Mg evaporation Bi-directional composition-graded structure Compression properties Energy absorbing performance

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Preparation and properties of YAG powder and porous ceramics

Preparation and properties of YAG powder and porous ceramics

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2014 Dianchi advanced materials Forum

作者： Zhao, Wen Bo Liang, Xin Hu, Fa Mei You, Liang Liang Ma, Bo Feng Wang, Ruo Lan Liu, Hong Ying Yang, Guo Sheng Tan, Bin Song, Jie Guang Wang, Fang Chen, Fei School of Mechanical and Materials Engineering Jiujiang University Jiujiang China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

ISBN: (纸本)9783038353348

Yttrium aluminum garnet (YAG) with a chemical composition of Y3Al5O12 is an important advanced structural and functional material. The preparation conditions were a pH of 9, a titration rate of lOml/minute and a reaction time of 60 minutes. The analysis shows that the YAG precursor does not have an obvious characteristic crystalline diffraction peak, the characteristic diffraction peak of YAG was found after the calcination of the YAG precursor at 1100°C for 1 hour, the characteristic diffraction peak of YAG is strong, which indicates that the YAG crystalline phase is integrated and pure. The pore microstructure of porous YAG ceramics marked differed with an increase in the sintering temperature, the compress strength of porous YAG ceramics is increased with an increase in the sintering temperature, the compress strength shows the opposite rule with the porosity, which indicates the mechanical properties of materials are effected with the densifìcation effect of materials. © (2014) Trans Tech Publications, Switzerland.

关键词： Yttrium aluminum garnet

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Research on the stability of organic/inorganic hybrid perovskite materials for IEC61215 purpose

Research on the stability of organic/inorganic hybrid perovs...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Jiang He Zhiliang Ku Yong Peng State key lab of advanced technology for materials synthesis and processing Wuhan University of Technology

Organi/Inorganic perovskite materials behavior differently under a testing condition of IEC61215. In this research, the behavior of series of perovskite materials with varied A cations under the thermal cycling testing standards were studied. We analyzed the defeating mechanisms of those materials through temperature depended XRD, SEM and AFM ***. Finally, we draw a conclusion that FACsPb（I/Br） perovskite materials could the most stable one under thermal cycling testing condition. This perovskite materials can be stable because the phase change related materials decomposition under frequent temperature change does not happen in this material, however other perovskite materials will decompose. A device with an architecture of FTO/TiO/FACsPbI/graphite electrode was then encapsulated and tested under a condition of -30℃-85℃ for 200 times. After testing, the device finally kept about 83% of its initial power conversion efficiency.

关键词： Standard stability tests Perovskite solar cells thermal cycling tests

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Optical properties of pulsed laser deposited K3Li2Nb5O15 thin films

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Rengong Jingti Xuebao/Journal of Synthetic Crystals 2008年第2期37卷 297-300页

作者： Zhan, Zu-Sheng Gong, Yan-Sheng Wang, Chuan-Bin Shen, Qiang Zhang, Lian-Meng State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China

Potassium lithium niobate (KLN:K3Li2Nb5O15) thin films have been deposited on quartz glass by pulsed laser deposition (PLD) technique using a stoichiometric KLN target, which was prepared by solid reaction with K2CO3, Li2CO3, and Nb2O5 powders as starting materials. X-ray diffraction (XRD) and Raman studies have revealed that tetragonal tungsten-bronze-type structure of KLN films with (310) preferred orientation could be achieved at the substrate temperature of 700°C and the oxygen partial pressure of 10 Pa. The average transmittance of as-deposited thin films in the visible range was nearly 90%.

关键词： Ferroelectric thin films

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Fabrication of W-Mo functionally graded material with density gradient

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materials Science Forum 1999年 308-311卷 628-633页

作者： Xiong, H. Zhang, L. Li, J. Tao, H. Yuan, R. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

W-Mo system functionally graded material with density gradient, which can be applied to dynamic high-pressure technology, was prepared by hot-pressing at 1573K. In order to obtain fully dense body, suitable amount of ... 详细信息

关键词： Tungsten alloys

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Thermal Stress Calculation and Fabrication of 6063 Al/60SiC‐35Al‐5Si Graded materials by Spark Plasma Sintering

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AIP Conference Proceedings 2008年第1期973卷 844-849页

作者： Zhang Dongming Zhang Lianmeng Gu Xiaofeng Chen Fei State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P.R. China

The high intensity of thermal stress was generated during fabrication of 6063 aluminum/60SiC‐35Al‐5Si double‐layer material. In order to decrease the thermal stress, graded materials of Al/60SiC‐35Al‐5Si was fabricated by spark plasma sintering. The CTE in the graded layer was controlled by SiC fraction and particle sizes. The calculation results indicate that the net stress of more than 800 MPa was generated in the double‐layer materials, but it decreased to 170 MPa or less in the graded materials. So the stability can be guaranteed in the graded composites. The graded layers also have the potential for high thermal conductivity, more than 180W/Mk for every layer, which satisfies the application.

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