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Novel Magnetorheological Suspensions Based on Co-Phthalocyanine/Fe Nanocomposite Particles

Journal of Materials Science & technology 2001年第5期17卷 511-516页

作者： Rongzhou GONG and Zekun FENG Dept. of Electronic Science and technology, Huazhong university of Science and technology, wuhan 430074, China Jianguo GUAN and Runzhang YUAN State Key Laboratory of Advanced technology for Materials Synthesis and Processing, wuhan univ. of technol. Wuhan 430070 China

A novel magnetorheological (MR) suspension was based on methyl silicone oil and cobalt-phthalocyanine (Co-Pc)/Fe nanocomposite particles, which were synthesized by thermally decomposing liquid carbonyl Fe in the solution of Co-Pc in N, N-dimethyl formamide. The nanocomposite particles were fully characterized by XRD, SEM and HREM, and the thermal, magnetic and MR properties of nanocomposite particles were measured. Such factors as weight percent of particles (w), magnetic field strength (H), temperature (T) and shear rate (gamma) etc influencing on MR properties were investigated. The results indicated that Co-Pc/Fe nanocomposite with density of 3.66 g/cm(3) was almost micro-sized regular spheroids consisting of tens of Co-Pc coated alpha -Fe nanoparticles in inner and Co-Pc layers on surface of the spheroids. They showed good characteristics of anti-oxidation and soft magnetic. Increment of w increased field-induced shear stress (Delta tau) and zero-field viscosity (eta (0)) of MR suspensions monotonously, and improved anti-settlement stability, but eta (0) increased more markedly than Delta tau with increasing w. Delta tau was basically independent on T and gamma while increased obviously with increasing H. With increasing T, response time of the MR suspension to external magnetic field seemed to decrease. As a result, MR suspensions with satisfactory stability and rapid, completely reversible and significant MR effect can be obtained from Co-Pc/Fe nanocomposite particles.

关键词： Fe Co Novel Magnetorheological Suspensions Based on Co-Phthalocyanine/Fe Nanocomposite Particles

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Fabrication of A1/Al_2O_3 Composites and FGM

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Journal of Materials Science & technology 2001年第6期17卷 646-648页

作者： Hong TAO, Chengji DENG, Lianmeng ZHANG and Runzhang YUAN State Key Laboratory of Advanced technology for Materials Synthesis and Processing, wuhan university of technology, wuhan 430070, China [Manuscript received November 27 wuhan univ. of technol. Wuhan 430070 China

Al/Al203 composites of different ratios were hot-press sintered at 575~640℃ under a pressure of 30 MPa for 2 h in a vacuum furnace. It was found that the relative density of the Al/Al203 composites could be increased evidently with the rise of sinter temperature. No reaction occurred between At and Al203 at the sinter temperatures. Under 640℃-30 MPa-2 h experimental condition, Al/Al203 system FGM was successfully fabricated, and its density range changed quasi-continuously from 2.887×103 kg/m3 to 3.1909×103 kg/m3 within the middle 1.0 mm thickness range.

关键词： Fabrication of Al/Al2O3 Composites and FGM Co Al

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XPS Analysis of Ni and Oxygen in Single-Sintered SrTiO_3 Multifunction Ceramic

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Journal of Materials Science & technology 2001年第5期17卷 535-537页

作者： Qing XU, Wen CHEN and Runzhang YUAN State Key Laboratory of Advanced technology for Materials Synthesis and Processing, wuhan university of technology, wuhan 430070, China wuhan univ. of technol. Wuhan 430070 China

XPS analyses have been performed to investigate the chemical conditions of Ni and oxygen on grain surfaces in single-sintered SrTiO3 capacitor-varistor ceramic doped with Nb2O5 and NiO. It is ascertained that Ni is in form of Ni2+ ions, which substitute for Ti4+ ions on grain surfaces during the oxidizing annealing. Moreover, it is confirmed that three kinds of chemically adsorbed oxygen such as O2-, O- and O-2(-) are formed on grain surfaces. It is proposed that these behaviors contribute greatly to the generation of multiple types of grain boundary acceptor states in the ceramic.

关键词： XPS Analysis of Ni and Oxygen in Single-Sintered SrTiO3 Multifunction Ceramic Ni

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Microstructure and Mechanical Properties of TiB_2/(Ni+Mo) Composites Fabricated by Hot Pressing

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Journal of Materials Science & technology 2000年第6期16卷 634-636页

作者： Zhang, J.Y. Fu, Z.Y. Wang, W.M. Wang, H. wuhan univ. of technol. Wuhan 430070 China

The fabrication of TiB2 ceramics with high performance at a relatively low temperature requires a second phase to assist the densification and control the microstructure. Moreover the interface characteristics of composites must also be considered. Nickel was chosen as a good metallic-bearing additive in this study. In order to optimize the interface, Mo was added. The results show that Mo can affect the interaction between TiB2 and Ni, and metallic liquid plays an important role in limiting the TiB2 grain growth in sintering.

关键词： NiMo Composites Fabricated by Hot Pressing Microstructure and Mechanical Properties of TiB2 Ni+Mo TiB

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EFFECT OF CHEMICAL COMPOSITION ON RETAINED AUSTENITE IN TRIP STEEL

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Acta Metallurgica Sinica(English Letters) 2002年第4期15卷 339-345页

作者： Y. Chen and X. Chenwuhan university of Science and technology, wuhan 430081, ChinaQ.F. Wang, G.L. Yuan and. C. Y. LiTechnical Center of wuhan Iron and Steel Co., wuhan 430080, ChinaX. Y. Li and Y.X. WangCentral Iron and Steel Research Institute, Beijing 1 wuhan univ. of Sci. and technol. Wuhan 430081 China

The systematic chemical compositions including common C, Si, Mn, Al, and micro-alloying elements of Ti and Nb were designed for high volume fraction of retained austenite as much as possible. The thermo-cycle experiments were conducted by using Gleeble 2000 thermo-dynamic test machine for finding the appropriate composition. The experimental results showed that chemical composition had a significant effect on retained austenite, and the appropriate compositions were determined for commercial production of TRIP steels.

关键词： carbon content silicon content manganese content retained austenite TRIP steel

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Densification of the Tungsten Heavy Alloys at 1473 K and Fabrication of W-Mo System FGM with Density Gradient

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Journal of Materials Science & technology 1999年第3期15卷 229-232页

作者： Xiong, HP Zhang, LM Li, JG Yuan, RZ wuhan univ technol State Key Lab Adv Technol Mat Synthesis & Proc Wuhan 430070 Peoples R China

The tungsten heavy alloys with Hi-Al and Fe-Al additives were sintered by hot-press method at 1473 K for 1 h. It was found that the relative density of the W-Fe alloy could be increased evidently by addition of Al. However, the relative density of W-Ni-Al alloy with low content of Al was conversely decreased considerably compared with that of W-Ni alloy. The causes have been studied. The sintering experiments of Mo alloy and W-Mo alloys with 3 wt pet Fe-1.5 wt pet Al additives were also carried out under the same sintering condition of low temperature. Finally, W-Mo system FGM with density gradient was successfully fabricated. Its density changed gradually from 17.0x10(3) kg/m(3) to 9.5x10(3) kg/m(3) within the middle 1.1 mm thickness range.

关键词： Tungsten alloys

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Fabrication of Mo Ti functionally graded material

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中国有色金属学会会刊：英文版 1999年第3期9卷 582-585页

作者： Xiong Huaping(熊华平) Zhang Lianmeng(张联盟) Shen Qiang(沈强) Yuan Runzhang(袁润章) wuhan univ technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China

Molybdenum alloys and titanium alloys were sintered at 1 473K for 1 h under a pressure of 30 MPa. It was found that the addition of Al can increase evidently the relative density of sintered Mo Fe alloys. The Fe Al additives are also suitable for the sintering of titanium alloys, and the Mo alloy and Ti alloy can be densified concurrently with the same additives 3%Fe 1.5%Al. The experimental results also showed that during the sintering of Mo Ti alloys the Fe Al sintering aids promoted the formation of Mo Ti solid solution, but the solid solution reaction occurred at the low sintering temperature of 1 473 K is inadequate. Finally, Mo Ti system functionally graded material has been successfully fabricated. Its density changed gradually from 9.52 g/cm 3 to 4.48 g/cm 3 in thickness direction. Such a material can be used in dynamic high pressure technology.

关键词： molybdenum titanium functional gradient alloys sintering

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SLAG CEMENT REINFORCED BY THE COMBINATION DOPING OF LIMESTONE AND ANHYDRITE

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Journal of wuhan university of technology(Materials Science) 1995年第2期10卷 58-63页

作者：杨淑珍宋汉唐 wuhan univ technol WUHAN 430070PEOPLES R CHINA

The hydration performances of slag cement mixed by limestone and anhydrite have been studied. The phase compositions and microstructures of the hydrates were determined and analysed by XRD and SEM. It is discovered that when slag cement is mixed with limestone and anhydrite, ihe hydrations of the clinker and slag are speeded. The amount of ettringite and hydrate calcium silicate are increased and the mechanical strength of slag cement are enchanced.

关键词： COMBINATION DOPING OF LIMESTONE AND ANHYDRITE MECHANICAL STRENGTH

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THE SHRINKAGE OF EXPANSIVE CONCRETE FILLED STEEL TUBE AND ITS IMPROVEMENT METHOD

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Journal of wuhan university of technology(Materials Science) 1999年第1期14卷 46-51页

作者： Li, Y Hu, SG Ding, QJ Zhou, MK Zhang, YS wuhan univ technol Coll Mat & Engn Wuhan 430070 Peoples R China

The shrinkage characteristics tics of expansive concrete filled steel tube (CFST) are analyzed, Cold shrinkage, creep and autogenous shrinkage are considered as the main reasons of causing CFST contraction. In accordance with the shrinkage characteristics of expansive CFST, a kind of energy-stored delayed expansive agent is exploited, which can not only compensate the shrinkage of the core concrete in every stages, but also make CFST expand according to the delayed expansion mechanism. As the result, the prestress loss weill be reduced and expansive energy will be utilized effectively.

关键词： concrete filled steel tube shrinkage mechanism expansive agent expansive model

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INFLUENCE OF MINERAL ADMIXTURES ON MECHANICAL PROPERTIES OF HIGH-PERFORMANCE CONCRETE

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Journal of wuhan university of technology(Materials Science) 1999年第2期14卷 1-7页

作者： Ma, Baoguo Li, Jinzong Peng, Jun wuhan univ technol Coll Mat Sci & Technol Wuhan 430070 Peoples R China Hong Kong univ Sci & technol Hong Kong Hong Kong

The improvements of the mechanical properties, including bulk density of fresh mixtures, elastic modulus, and compressive strengths of four high-performance concrete mixtures, made with the addition of fly ash, refined ground blast - furnace microslag (microslag) and silica fume are studied. The concrete mixtures were determined based on the dispersion testing results. The study indicates that the elastic modulus at 28 and 91 days, and compressive strengths of the concretes are improved a lot when fly ash and microslag by 25 percent by weight of cement are added into the mixtures individually. The improvement is especially evident when silica fume by 5 percent and fly ash by 25 percent by weight of cement are added together into the mixture, while the fresh concrete mixture keeps a good workability. Through the analysis of chemically combined water ratios of the four mixtures at various hydration ages, it is found that the addition of all these mineral mixtures are beneficial to the hydration process, especially, at later stages, which might be one of the reasons for the improvement of mechanical properties. (Author abstract) 4 Refs.

关键词： high-performance concrete mineral admixture mechanical properties

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