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Mechanical Properties and Fracture Behaviour of Multilayer Alumina Composites

Journal of Wuhan University of technology(materials Science) 2015年第5期30卷 965-967页

作者：郑新国 ZHAO Fei 张金咏 Railway Engineering Research Institute of China Academy of Railway Science State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

Adopting a ceramic/polymer multilayer structure design to simulate the structure of nacre is usually believed to be an effective way to increase the toughness of ceramic composites at the expense of the material’s bending strength. However, in this study, we found that both the bending strength and the toughness could be improved simultaneously when using a certain Al2O3/Kevlar multilayer composite design compared to pure alumina samples with the same dimensions. The fracture behaviour of the Al2O3/Kevlar multilayer composite was studied to find a reason for this improvement. The results showed that the complex and asymmetrical stresses occurring in the Kevlar-reinforced layers were the main reason for the differences in fracture behaviour. We expect our results to open up new ways for the design of future high performance ceramic composites.

关键词： biomaterials alumina multilayer composite toughening

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Temperature Field Distribution in Spark Plasma Sintering of BN

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Journal of Wuhan University of technology(materials Science) 2002年第2期17卷 19-21页

作者：王玉成 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

This paper studies the temperature distribution of BN, an insulating material, sintered in the Spark Plasma Sintering ( SPS) system. The temperature distributions of BN at different heating rates were measured , which showed that seeking for an over high heating rate in SPS is not as desirable as controlling of a suitable heating rate in order to have a fast sintering with a uniform temperature distribution.

关键词： Spark Plasma Sintering ( SPS) temperature distribution BN heating rate

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Optimization of p-type Segmented Bi_2Te_3/CoSb_3 Thermoelectric material Prepared by Spark Plasma Sintering

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Journal of Wuhan University of technology(materials Science) 2006年第4期21卷 126-129页

作者：王军 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A kind of p-type segmented Bi2 Te3/CoSB3 thermoetectric material was preparea oy sparse ptasma sintering（ SPS ） . When the segmented materials were used at the temperature ranging from 300 K to 800 K, the junction temperature was optimized, which is about 500 K, and the corresponding length ratio of CoSb3 to Bi2 Te3 is about 15 ： 2. The measured maximum power output of segmented materials is abont 320 W·m^-2, which is about 1.8 times as high as that of monolithic material CoSb3 under the same measuring conditions.

关键词： CoSb3 compounds bismuth telluride segmented thermoelectric materials power outpats

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A Flier-plate material with Graded Impedance Used in Dynamic High-pressure Physics

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Journal of Wuhan University of technology(materials Science) 2002年第4期17卷 32-35页

作者：王传彬 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

By using such flier-plate material,quasi-isentropic compression can be *** on it,hypervelocity launching is further *** a result,an extremely high dynamic pressure can be obtained in laboratory,offering a practical method for the comprehensive determination of materials behavior,response,equation-of-state and properties in dynamic loading process.

关键词： flier-plate material with graded impedance quasi-isentropic compression hypervelocity launching

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In-situ Preparation of TiB_2-TiB-Ti Functionally Graded materials by Improved Sintering Process

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Journal of Wuhan University of technology(materials Science) 2015年第4期30卷 710-714页

作者：刘国玺 LI Kezhi ZHANG Jinyong 张帆 School of Materials Science Northwestern Polytechinical University Ningbo Branch of Ordnance Science Institute of China State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

An improved multi-step sintering process was used to in-situ prepare TiB2-TiB-Ti FGMs. According to the sintering temperatures, the functionally graded materials （FGMs） were divided into three sections. After sintering at a proper temperature, the three sections were sintered together in turn. The experimental results showed that there were no obvious pores and cracks in the whole TiB2-TiB-Ti FGMs, and no delamination was found in the impacting test with good performance features, which indicated that there were no interface effects in FGMs during penetration, so that the TiB2-TiB-Ti FGMs were an ideal FGM.

关键词： FGMs TiB2 Ti Fabrication

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Microstructure and resistivity of iridium oxide thin films by pulsed laser deposition technique

Microstructure and resistivity of iridium oxide thin films b...

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作者： Zhang, L.M. Gong, Y.S. Wang, C.B. Shen, Q. State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Highly conductive IrO2 thin films were prepared on Si (100) substrates by pulsed laser deposition technique from an iridium metal target in an oxygen ambient atmosphere. The effect of substrate temperature on the structure and electrical properties of IrO2 films was investigated. The deposited films at substrate temperatures ranging from 250 to 500°C under an oxygen pressure of 20Pa were pure polycrystalline tetragonal IrO 2 and the preferential growth orientation changed with the substrate temperature. IrO2 films were well solidified with the fairly homogeneous thickness and exhibited a good adhesion with the substrate. The room-temperature resistivity of IrO2 films decreased with the increase of substrate temperature and the minimum resistivity of (42±6) μΩ·cm was deposited at 500°C.

关键词： Thin films

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Preparation of High Performance Green Alumina Ceramic Balls by Roller Production Waste

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武汉理工大学学报（材料科学版）（英文版） 2008年第1期23卷 134-138页

作者： ZHONG Lianyun WU Bolin ZHANG Lianmeng ZHANG Guifang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Key Lab of Nonferrous Materials and New Processing Technology( Guangxi University Guilin University of Technology) of Ministry of EducationGuilin 541004China School of Chemistry and Ecological Engineering Guangxi University for NationalitiesNanning 530006China Key Lab of Nonferrous Materials and New Processing Technology Guangxi University Guilin University of Technology of Ministry of EducationGuilin 541004China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

To reuse roller waste as a raw material of high performance green ceramic balls,three kinds of white alumina ceramic balls whose wear resistance were 2-3 times of the best high alumina ceramic ball with90% Al2O3 were prepared,and the Al2O3 content of the prepared balls was 75%.It is found that the effect of calcia and magnesia on the wear resistance of ceramic balls is contrast to the accepted one: the wear rate of the ceramic balls prepared in CaO-Al2O3-SiO2 system is the lowest and the wear rate of the ceramic balls prepared in MgO-Al2O3-SiO2 is the *** main crystal phase of the ceramic ball is mullite and *** ceramic ball granular is uniform and fine with 4-5 um average *** pore diameter is about 2 *** wear way of the ceramic balls is mainly transcrystalline fracture.

关键词： roller production waste alumina ceramic ball wear resistance white transcrystalline fracture

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Growth and properties of pulsed laser deposited K3Li2Nb5O15 thin films

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key Engineering materials 2007年 351卷 184-188页

作者： Zhan, Zusheng Gong, Yansheng Shen, Qiang Zhang, Lianmeng 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 Hubei Wuhan 430074 China

Potassium lithium niobate (KLN: K3Li2Nb5O15) films have been deposited on quartz glass by Pulsed laser deposition (PLD) technique using a stoichiometric KLN target as starting materials. By investigating the effects of both the oxygen pressure and the substrate temperature on the structure of KLN films, optimum parameters have been identified for the growth of high-quality KLN films. At 10Pa oxygen ambient pressure, tetragonal tungsten-bronze-type structure of KLN films with (310) preferred orientation can be achieved at substrate temperatures in the range of 700-800°C Optical studies indicate that the films are highly transparent in the visible-near-infrared wavelength range.

关键词： Thin films

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Fabrication of nano porous PVDF beads

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2nd International Conference on materials Science and Engineering, ICMSE 2013

作者： Luo, Dabing Tao, Yang Xiang, Bin Wang, Yanfei Liu, Hanxing State Key Lab of Advanced Technology for Materials' Synthesis and Processing Wuhan University of Technology Wuhan Hubei China

ISBN: (纸本)9783037856444

After dissolve PVDF in DMF, porous PVDF beads were prepared by water assistant. The porous beads were better crystallized and possessed greater relative surface than ordinary PVDF. The results suggested that the relative surface of PVDF reach 6.53m2/g while the dripping speed was 0.95ml/min. The material could rise to the modulator to fabricate nanometer fiber polymers. © (2013) Trans Tech Publications, Switzerland.

关键词： Fabrication

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Preparation of W/W-Cu/Cu system functionally graded material by one-step hot-press sintering

Preparation of W/W-Cu/Cu system functionally graded material...

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2nd International Congress on Ceramics, ICC 2008

作者： Wang, C.B. Zeng, H. Shen, Q. Li, L. Zhang, L.M. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9788880800842

A material in the system W/W-Cu/Cu with a density gradient, which has an important application in dynamic high pressure physics, was prepared by one-step hot-press sintering. W-Cu composite interlayers were produced from W and Cu powders with Zn (2wt%) as the sintering aid. With increasing the sintering temperature, the relative density of W-Cu composites increased, reaching a higher value (>96%) at 850°C. Then by inserting three W-Cu composite interlayers between the tungsten and copper alloy plates followed by one-step hot-press at 850°C-20MPa-60min, a wholly dense W/W-Cu/Cu system functionally graded material was obtained, which had a large density range from 8.9 to 17.25g/cm3.

关键词： Functionally graded materials

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