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Synthesis of SiC/Al Co-Continuous Composite by Spontaneous Melt Infiltration

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Journal of Materials Science & Technology 2000年第5期16卷 466-470页

作者： Guangwei HAN and Di FENG (central iron & steel {3. institute, beijing 1.0081. china) central iron and steel {3. institute Beijing 100081 China

Investigation has been made on the process of synthesizing SiC/Al co-continuous composite by spontaneous melt infiltration. It is found that nitrogen atmosphere is an indispensable factor for spontaneous infiltration of melt Al into SiC preform with continuous porosity. The critical temperature for spontaneous infiltration occurrence can be lowered and spontaneous infiltration rate increased by doping a small amount of Mg into the Al alloy. Adding fine SiO2 powders into the ceramic preform can play the similar role as Mg-doping by increasing wetting through the chemical reaction of 3.iO2+4AI=2Al2O3.3.i at the infiltration front. Infiltration rate can also be increased by Si-doping to lower the viscosity of the molten Al alloy. In addition, sufficient Si content in the molten Al is also indispensable to avoid the formation of Al4C in the synthesized composite.

关键词： Co SiC Synthesis of SiC/Al Co-Continuous Composite by Spontaneous Melt Infiltration Al

Effects of Temperature and Disperse Phase of Disordered γ on Strain Hardening Rate of Ni_3.l

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Journal of Materials Science & Technology 1995年第6期11卷 403-408页

作者： Guangwei HAN Di FENG and Wujun YE (central iron and steel {3. institute, beijing, 1.0081. china) central iron and steel {3. Inst Beijing China

Investigations have been made on the effects of temperature and fine disperse phase of disordered γ on strain hardening rate of Ni3.l based alloy. The result is found that there exists a peak temperature for the strain hardening rate of Ni3.l based alloy below the peak temperature of its yield strength. Analysis shows that the appearance of the peak temperature of strain hardening rate is caused by both the decreasing of the movability of superdislocations on {111}slip plane and the increasing of the dynamic recovery in Ni3.l with increasing temperature. A Ni3.l based alloy hardened by disperse phase of disordered γ has been obtained by controlling chemical composition and treating processes. The peak temperature of strain hardening rate of this alloy is increased due to the fine disperse phase of disordered γ, which causes the reductions of the movability of the superdislocations and the dynamic recovery in Ni3.l

关键词： OO Al on Strain Hardening Rate of Ni3.l Ni

Development of Rapidly Quenched Soft Magnetic Materials in china

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Journal of Materials Science & Technology 2000年第2期16卷 131-136页

作者： Shaoxiong ZHOU (National Amorphous and Nanocrystalline Alloy Engineering research Center, central iron and {3. research institute, beijing 1.0081. china) National Amorphous and Nanocrystalline Alloy Engineering research Center Central Iron and Steel Research Institute Beijing 100081 China

The discovery of the first Fe-based ferromagnetic amorphous alloy in 1966 had made an impact on conventional magnetic materials because of its unique properties. Since then, a number of amorphous magnetic materials have been successfully developed and used in a wide variety of applications. A brief review of R & D activities on amorphous soft magnetic materials in china is given from the beginning to the present in a somewhat chronological order, followed by a brief introduction to their applications on electric and electronic industries. An analysis and a prospect of Chinese market of such amorphous materials are also presented.

关键词： Development of Rapidly Quenched Soft Magnetic Materials in china

ADVANCE IN Ti_3.Al AND TiAl INTERMETALLICS research IN CISRI

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 531-541页

作者： ZHONG Zengyong ZO U Dunxu LI Shiqiong (central iron and steel {3. institute, beijing 1.0081.. china) central and steel research Inst Beijing China

Recent work on Ti_3.l base alloy,TAC-1, developed in CISRI, including investigations of effects of modification in alloying and TMP on microstructural characteristics and mechanical behaviour,indicates that alloy TAC -1 is very promising structural material for a number of elevated temperature applications. Stuody dealing with a reverse relation between RT ductility and toughness found on TiA base alloy, TAC-2, led to development of a special heat treatment technique for producing a fine filly lamellar microstructure (FFL), which gives a high and balancing ductility and toughness. This is also of significance for promoting engineering applications of this alloy.

关键词： Ti_3.l TiAl intermetallics

Ionization Potentials and Electron Affinities of Cu_n Atomic Clusters

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Journal of Materials Science & Technology 1994年第1期10卷 71-74页

作者： Senyying LIU Rongze HU and Chongyu WANG(central iron and steel {3. institute, beijing, 1.0081. china) central iron and steel {3. Inst Beijing China

Ionization potentials and electron affinities of Cux (n = 2-7) atomic clusters with the optimal geom etries have been calculated by use of SC F-Xa-SW method and Slater's transition state theory. Theo retical calcuIations show that the ionization potentiaIs and electron affinities of Cu. (n = 2-7) atom ic clusters have a sharp even / odd alternation with increasing their sizes, which are related to the electronic structure of Cun atomic clusters. The theoretical results are consistent with the related ex perimental ones.

关键词： Cu Rev Ionization Potentials and Electron Affinities of Cu_n Atomic Clusters Figure

THERMODYNAMIC PROPERTIES OF Al-Ce-Pb(or Sn) LIQUID SOLUTIONS

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中国有色金属学会会刊：英文版 1993年第3期3卷 27-28,51页

作者： Sun, Yunyong Du, Ting central iron and steel {3. institute, beijing 1.0081. china

Thermodynamic properties of Al-Ce-Pb and Al-Ce-Sn liquid systems were studied by direct equilibrium method at 800℃. The results obtained include: equilibrium products, their standard Gibbs energies of formation, equi... 详细信息

关键词： aluminum-base solutions cerium lead tin thermodynamic properties

Electrode Characteristics of MmNi_5-based Alloys for Nickel-Metal Hydride Batteries

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Journal of Materials Science & Technology 1994年第4期10卷 310-312页

作者： Mingming GENG (Dept. of Precision Alloy, central iron & steel {3. institute, beijing, 1.0081. china) central iron and steel {3. Inst Beijing China

Negative electrodes of the Ni-metal hydride battery were made from hydrogen storage alloy Mm0.9Ti0. 1Ni3. 9Mn0.4Co0.4Al0.3.mod fied by coating with Ni or mixing with Co powder. The cell volume expansion of hexagonal structure was about 12 % after coating with 11 % Ni on the alloy Surface,When this alloy was mixed with Co powder. the discharge capacity and the utilization efficiency of the hydrogen storage alloy increased. When the alloy was coated with 11 wt-% Ni and also mixed with 10 wt-% Co powder. the capacity decay for a small sealed cylindrical cell (AA size. 1 Ah) was only about 4 % after 200 cycles

关键词： Ni Met Electrode Characteristics of MmNi5-based Alloys for Nickel-Metal Hydride Batteries PVA

Thermodynamics of Cu-Y-I (I=Sn, Zn, Pb) Liquid Solutions

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Journal of Materials Science & Technology 1994年第3期10卷 217-220页

作者： Ting DU and Guodong LI(central iron and steel {3. institute, Ministry of Metallurgical Industry, beijing, 1.0081. china) central iron and steel {3. Inst Ministry of Metallurgical Industry Beijing China

The isoactivity of [Y] of samples was obtained in multiple- hole graphite crucibles by controlling the oxygen potential through the reaction 2 [Y]+3.O = Y2O3.3.. The activity interaction coefficients between Y and Sn. Zn, Pb alloying elements were determined by using coniugate gradient method of solving ill-conditioned equations. The equilibrium constant of the reaction 2 [Y]+3.[O] = Y2O3.and the standard free energy of formation of Y2O3.in liquid Cu were obtained at 1200℃

关键词： Pb Liquid Solutions I=Sn Thermodynamics of Cu-Y-I Zn I Cu

More Discussion on High Efficiency & Low Cost Clean steel Production Platform

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Journal of iron and steel research International 2011年第S2期18卷 1-8页

作者： YIN Rui-yu (central iron and steel {3. institute, beijing, 1.0081. Cent iron & steel Res Inst Beijing 100081 Peoples R China

The construction of high efficiency, low cost clean steel platform is one of the common key technologies concerning efficiency, quality and cost. It is basic and universal and not only applicable in the R&D and production of "high-end" products, but also in the production of bulk ordinary steel products. The platform of high efficiency, low cost clean steel is the important direction of modern steel technology progress and has great significance on the competitiveness of each steel plant. The research of high efficiency, low cost platform not only involves the production and management of the steel plant, but also the academic research field (process engineering and dynamic operation) and theories and methods innovation of engineering design (theory and method of dynamic-precision design). The integrated theory and method of high efficiency and low cost clean steel platform is the binding point of metallurgical process engineering and material engineering. Different types of high efficiency, low cost clean steel platform should combine with the corresponding rolling process and iron making process so that high efficiency, low cost clean steel manufacturing system would come into being.

关键词： more discussion high efficiency & low cost clean steel platform integration technology