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Research on the Modification of Kevlar by Grafting Carbon nanotubes

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Research on the Modification of Kevlar by Grafting Carbon na...

2010(沈阳)国际安全科学与技术学术研讨会

作者： CHEN Wei,~1 QIAN Xin-ming,~1 HE Xue-qiu,~1 liu Zheng-yi,~1 liu Ji-ping~2 (1.State Key Laboratory of Explosion science and technology,beijing Institute of technology,beijing,100081,china 2.school of material science and engineering,beijing Institute of technology,beijing 100081,china)

＜正＞A novel and efficient method was developed for surface-modification of Kevlar fibres by grafting carbon nanotubes （MWCNTs）.Kevlar fibres were firstly treated with hexamethylene diisocyanate and DABCO to introduce pendant amine groups on surface,then the modified fibres were swelled in a suspension of carbon nanotubes which were acyl chlorination pretreated to graft nanotubes to fibre *** resulting fibre was characterized with SEM,infrared spectroscopy and tensile measurement. For the SEM micrographs,most parts of the fibre surface are coated by ***,the mean value of tensile strength of Kevlar fibre was improved by 12%compared with original *** interlaminar shear strength（ILSS） of the fibrereinforced bismaleimides composite was *** results show that the ILSS of the MWCNTs-grafted Kevlar sample can be increased by 30%.

关键词： Kevlar fiber surface modification carbon nanotube mechanical properties

Influence of Additive Silica on the Laser Melting of the Ceramic Coatings

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Journal of materials science & technology 2003年第1期19卷 33-36页

作者： Yuanzheng YANG, Xiaojun BAI, Zhiwei XIE and Tongchun KUANGFaculty of material and Energy, Guangdong university of technology, Guangzhou 510643, chinaZhengyi liu and Yuzhi ZHUANGDept. of Mechano-Electronic engineering, South china university of technology, Guangzhou 510641, chinaBaiyun TONG and Yong LIANGInstitute of Metal Research, Chinese Academy of sciences, Shenyang 110016, china Faculty of Mat. and Energy Guangdong Univ. of Technol. Guangzhou 510643 China Dept. of Mech.-Electron. Eng. South China Univ. of Technol. Guangzhou 510641 China Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The influence of additive silica on the microstructure of plasma sprayed Al2O3 and Al2O3+13 wt pct TiO2 ceramiccoatings at laser melting has been investigated in this study. At the laser melting, additive silica in Al2O3 ceramiccoating can reduce the stress of cooling shrinkage generated during solidification. Moreover, silica can render finersize of grains of the melting layer and form continuous glassy matter around the grain boundaries so as to reducefurther the cooling stresses and to suppress the formation and spreading of cracks. On the other hand, at the lasermelting, TiO2 reacts with Al2O3 and transforms into TiAl2O5. The latter new phase has great and anisotropiccoefficients of thermal expansion leading to big and asymmetrical stresses and thus to form cracks in the meltinglayer of Al2O3+13 wt pet TiO2 coating. Due to the fact that the influence of additive silica on the suppression of theformation of cracks is rather limited and cannot counterbalance the negative effect of TiAl2O5, thus the melting layerof Al2O3+13 wt pct TiO2 coating doped with 3 wt pct SiO2 cracks also. Nevertheless, TiO2 can greatly developthe wear resistance of the ceramic coating as sprayed or laser melted.

关键词： Plasma spraying Laser remelting Additive silica Stress crack

The Effects of Aging Precipitation on the Recrystallization of CuNiSiCr Alloy

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Journal of Wuhan university of technology(materials science) 2005年第1期20卷 21-24页

作者：雷静果刘萍 College of material Xi' an University of Technology Xi' an 710048 China School of Materials Science and Engineering Henan University of Scienc e & Technology Luoyang 471003 China

The interaction between precipitation and recrystallization and its effect on t he properties of the Cu-Ni-Si-Cr alloy during aging were *** result s show that the deformation results in much more dispersed precipitation of the phases. The precipitations have accelerating or retarding effects on the recryst allization. On the formation and growth of recrystallization, the precipitated p hases are coarsed or dissolved in front of grain boundaries following a re-prec ipitation in the recrystallization area.

关键词： CuNiSiCr alloy aging precipitation recrystallization

A Photosensitive Copolymer for UV-curable Electrodeposition Coatings

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Journal of Wuhan university of technology(materials science) 2011年第6期26卷 1098-1102页

作者：刘仁刘晓亚 school of Chemical and material engineering Jiangnan University

A series of photosensitive random copolymers （UPDHES） were prepared by introducing acrylate groups onto the side chain of the copolymer backbone of N, N-domethyl amimethyl methacrylate （DMAEMA）, 2-hydroxypropyl acrylate （HEA）, 2-ethylhexyl acrylate （EHA）, and styrene （St）（PDHES）. The molecular structure of UPDHES was characterized by FTIR, 1HNMR and GPC. The photopolymerization kinetics of UPDHES with different C=C content was investigated using real time FTIR in which it was found that the UPDHES system had notable photosensitivity. The effect of C=C content on the properties of cured films were studied by evaluating various film properties such as thermal stability, glass transition temperature and tensile properties. The thermal degradation of cured films was investigated via thermogravimetric analysis/infrared spectrometry （TGA-IR）. Thus a series of UV-curable electrodeposition coatings with good photosensitivity and mechanical properties were prepared from a low-cost photosensitive random copolymer.

关键词： UV-curable electrodeposition coatings photosensitivity

Aging Behavior of Cu-Cr-Zr-Ce Alloy

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Aging Behavior of Cu-Cr-Zr-Ce Alloy

14～(th) Congress of International Federation for Heat Treament and Surface engineering

作者： liu Yong liu Ping SU Juan-hua TIAN Bao-hong LI Weischool of material science & engineering Xi’an university of technology Xi’an .chinaschool of material science & engineering Henan university of science & technology Luoyang china

＜正＞ The aging properties of Cu-0.35Cr-0.038Zr-0.055Ce alloy are studied. The results show that can obtain higher electrical conductivity and microhardness after solutioned at 920℃for Ih, and aged at 500℃. The process of precipitation of the secondary phase can be accelerated with cold deformation before aging, so properties of the alloy are improved. Upon aging at 500℃for 30 minutes after 60% cold deformation, the values of electrical conductivity and microhardness are 69.0%IACS and 152HV respectively, but they are only 66.2%IACS and 136HV upon directly aging after solution. With the addition of a trace of rare earth element Ce, the value of microhardness of Cu-0.35Cr-0.038Zr alloy increases 18-25HV, while the value of electrical conductivity drops a little.

关键词： Cu-Cr-Zr alloy rare earth aging cold deformation electrical conductivity microhardness

The Crystal Structure of Tetranitrodibenzoylhexaazaisowurtzitane

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The Crystal Structure of Tetranitrodibenzoylhexaazaisowurtzi...

2003年国际推进剂、炸药、烟火技术秋季研讨会

作者： Shusen CHEN Jie ZHOU Wenge QIU & Jiangqiang liu(school of material science and engineering beijing Institute of technology P O Box 327 beijing 100081 china) (Department of Fire Protection engineering Chinese People’s Armed Police Force Academy Langfang 065000 Hebei china)(beijing Polytechnical university beijing 100022 beijing)

＜正＞ Aim to determine the molecule structure of tetranitrodibenzoylhexaazaisowurtzitane. Methods X-ray diffraction of monocrystallography. Results and Conclusion Crystal data: C20H16N10O10;Monoclinic;space group: C2/c;a=1.8935（4）nm, b=1.3084（3）nm, c=1.1759（2）nm, a =90°,β=125.85（3）°,γ=90°, V=2.3613（8）（nm）3;and Z=4.

关键词： crystal strictire’cage compound tetranitrodibenzoylhexaazaisowurtzitane

Study on the Waste Recycling and Reuse Patterns in Coal Mines

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Study on the Waste Recycling and Reuse Patterns in Coal Mine...

2010 2nd IEEE International Conference on Advanced Management science（IEEE ICAMS 2010）

作者： Zhenling liu school of Management Henan university of technology Zhengzhou china Zhengquan Guo school of Management china university of Mining & technology(beijing) beijing china Gang Li Department of Resources and Environmental engineering Henan Institute of engineering Zhengzhou china Wenbo Tan school of Management china university of Mining & technology (beijing) beijing china

Since 2006,china has become the largest coal production and consumption country in the ***,the coal mining waste has become the greatest threaten to the environment and *** to the recycling economy thought,many coal mining waste can be reused and recycled that can produce great benefits for enterprises and *** this paper,the recycling economy thought is introduced for its ***,based on the thought,the reuse and recycles of the coal mining waste practice are assigned according to the waste *** research result indicated that the recycling economy is the best chose for the economy and society sustainable development.

关键词： coal mining waste,recycling economy,industrial chains material flow

Synthesis and Characterization of Mesoporous Silicon Oxynitride MCM-41 with High Nitrogen Content

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Journal of Wuhan university of technology(materials science) 2005年第2期20卷 32-34页

作者：张存满 school of material science and engineering Tongji UniversityShanghai 200092China Ph D

Mesoporous silicon oxynitrides MCM-41 were synthesized successfully. The resulting materials not only have high nitrogen contents and good structural characteristics of MCM-41 (high surface area, narrow pore size distribution and good order), but also are amorphous. The composition and structure of the materials were investigated by CNH element analysis, XPS, Si MAS NMR, XRD, HRTEM and N-2 sorption, respectively. Mesoporous silicon oxynitrides MCM-41 with a high nitrogen content are still non-crystal (amorphous).

关键词： mesoporous silicon oxynitride MCM-41 high nitrogen content

Surface Topography of Fine-grained ZrO_2 Ceramic by Two-dimensional Ultrasonic Vibration Grinding

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Journal of Wuhan university of technology(materials science) 2011年第6期26卷 1162-1165页

作者：丁爱玲 school of Mechanical and Automation engineering North University of China

The surface quality of fine-grained ZrO2 engineering ceramic were researched using 270# diamond wheel both with and without work-piece two-dimension ultrasonic vibration grinding（WTDUVG）. By AFM images, the surface topography and the micro structure of the two-dimensional ultrasonic vibration grinding ceramics were especially analyzed. The experimental results indicate that the surface roughness is related to grinding vibration mode and the material removal mechanism. Surface quality of WTDUVG is superior to that of conventional grinding, and it is easy for two-dimensional ultrasonic vibration grinding that material removal mechanism is ductile mode grinding.

关键词： two-dimension ultrasonic vibration grinding surface topography ductile grinding