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Comparison between the Requirements of Flowability and Moldability and the Shape Retention of PIM Compacts during Debinding Process

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Journal of Materials Science & Technology 2001年第5期17卷 490-494页

作者： K.A.KhaliI, Baiyun HUANG and Yimin LI State Key Laboratory for powder metallurgy, central south university, changsha 410083, china M.M.El-Sayed Seleman Department of Materials Science and Engineering, Northeastern university, Shenyang 110006, china State Key Lab. for powder Metall. Central South Univ. Changsha 410083 China

To successfully employ powder injection molding (PIM) as a manufacturing technique, the function of the component, design of the part, material and process should be optimized for overall processing ability of the PIM process. A comparison between the requirements of flowability and moldability and the compacts shape retention has been made in this work. There is often a contradiction between the requirements of flowability and the compacts shape retention. Many works have been done to attain good molding conditions. However, they fail to take into account the effect of some factors that satisfies good molding conditions on the compacts shape retention during debinding. This paper studies the effect of the powder-binder mixture characteristics and the molding conditions on the flowability and moldability and the shape retention of PIM compacts during debinding process so as to attain the benefits of each.

关键词： PIM Comparison between the Requirements of Flowability and Moldability and the Shape Retention of PIM Compacts during Debinding Process

INFLUENCE OF ALKALI HALIDE ADDITIONS ON TANTALUM powder PRODUCTION

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中国有色金属学会会刊：英文版 1996年第3期6卷 36-39页

作者： Chai Liyuan Zhong Haiyun(Department of Nonferrous metallurgy,Cenlral south university of Technology, changsha 410083) Department of Nonferrous metallurgy Central South University of Technology Changsha 410083 China

ＩＮＦＬＵＥＮＣＥＯＦＡＬＫＡＬＩＨＡＬＩＤＥＡＤＤＩＴＩＯＮＳＯＮＴＡＮＴＡＬＵＭＰＯＷＤＥＲＰＲＯＤＵＣＴＩＯＮ￥ＣｈａｉＬｉｙｕａｎ；ＺｈｏｎｇＨａｉｙｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＮｏｎｆｅｒｒｏｕｓＭｅｔａ... 详细信息

ＩＮＦＬＵＥＮＣＥＯＦＡＬＫＡＬＩＨＡＬＩＤＥＡＤＤＩＴＩＯＮＳＯＮＴＡＮＴＡＬＵＭＰＯＷＤＥＲＰＲＯＤＵＣＴＩＯＮ￥ＣｈａｉＬｉｙｕａｎ；ＺｈｏｎｇＨａｉｙｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＮｏｎｆｅｒｒｏｕｓＭｅｔａｌｌｕｒｇｙ，ＣｅｎｌｒａｌＳｏｕ...

关键词： K2TaF7 diluent phase diagram molten salt system Ta powder specific capacity

THE　PROCESS　AND　MECHANISM　OF　TiAl－BASED　ALLOY　SYNTHESIZED　FROM　Ti　AND　AlP　OWDERS

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Journal of central south university 1995年第2期7卷 8-11页

作者： XionAx Xiany Huang Baiyun(powder metallurgy research Instituie. central south university of Technology, changsha, 110083, china ) powder metallurgy research institute Central South University of Technology Changsha China

The microstructures and elemental distribution of dense TIAl based alloy products produced by reactive-hot-Pressing 1: 1 Ti-Al blend powder were observed and analysed with scanning electIOn microscope (SEM ). The fou... 详细信息

关键词： TiAl reactive mechanism reactive Process reactive-hot-Pressing

DEGRADATION DUE TO ENERGY PULSE IN HIGH-ENERGY ZnO VARISTORS

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Journal of central south university 1997年第2期9卷 113-116页

作者： Zhang Shugao Huang Baiyun Fang Xunhua (powder metallurgy research institute, central south university of Technology, changsha 410083, china)Ji Youzhang (institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, china) powder metallurgy research institute Central South University of Technology Changsha 410083 China institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China

The degradation phenomena due to the energy pulse in the high-energy ZnO varistors used for deexitation and overvoltage protection of hydroelectric generator are investigated. The energy pulse, obtained by releasing the energy stored in an inductor, can be equivalent to the combination of the DC field components and the energy component. The variations of the characterized voltages, nonlinear coefficients and pre-breakdown V-A characteristics, increase with the number of the applied energy pulse. The asymmetrical variations of the electric properties of the high-energy ZnO varistors after the energy pulse arise from the deformation of the double Schottky barriers due to the ion migration occuring in the depletion layer and in the grain boundary.

关键词： high-energy ZnO varistors energy pulse degradation V-A characteristics grain boundary barrier ion migration

EFFECTS　OF　TEMPERATURE　ON　DISTRIBUTION　BEHAVIORS　OF　MINOR　ELEMENTS　IN　COPPER　FLASH　SMELTING──COMPUTER　SIMULATION

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中国有色金属学会会刊：英文版 1996年第4期6卷 38-41页

作者： Tan Pengfu Zhang Chuanfu(Department of Nonferrous metallurgy,central south university of Technology,changsha 410083) Tong Rae Cho(Department of Metallurgical Engineering,Chungnam National university,south Korea) Department of Nonferrous metallurgy Central South University of Technology Changsha 410083 China Department of Metallurgical Engineering Chungnam National University South Korea

ＥＦＦＥＣＴＳＯＦＴＥＭＰＥＲＡＴＵＲＥＯＮＤＩＳＴＲＩＢＵＴＩＯＮＢＥＨＡＶＩＯＲＳＯＦＭＩＮＯＲＥＬＥＭＥＮＴＳＩＮＣＯＰＰＥＲＦＬＡＳＨＳＭＥＬＴＩＮＧ──ＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮ￥ＴａｎＰｅｎｇｆ... 详细信息

ＥＦＦＥＣＴＳＯＦＴＥＭＰＥＲＡＴＵＲＥＯＮＤＩＳＴＲＩＢＵＴＩＯＮＢＥＨＡＶＩＯＲＳＯＦＭＩＮＯＲＥＬＥＭＥＮＴＳＩＮＣＯＰＰＥＲＦＬＡＳＨＳＭＥＬＴＩＮＧ──ＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮ￥ＴａｎＰｅｎｇｆｕ；ＺｈａｎｇＣｈｕａｎｆｕ（Ｄｅ...

关键词： As Sb Bi Pb Zn simulation computer model thermodynamics

Effect of aluminum-containing additives on the reactivity in air and CO_2 of carbon anode for aluminum electrolysis

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Rare Metals 2004年第2期23卷 109-114页

作者： LAI Yanqing LI Jie LI Qingyu DING Fengqi School of Metalling Science and Engineering, central south university, changsha 410083, china School of metallurgy Science and Engineering Central South University Changsha 410083

Airburn reaction and carboxy reaction result in the excess consumption ofcarbon anode in aluminum electrolysis. To reduce the excess carbon consumption, carbon anode wasdoped with aluminum-containing additives, such as Al, Al_4C_3, AlF_3 and Al_2O_3. Their reactivityin air and CO_2 was determined with an isothermal-gravimetric method to study the effect ofaluminum-containing additives on the reactivity in air and CO_2 of carbon anode. Results shown thatthe airburn reactivity at 450℃ and carboxy reactivity at 970℃ of carbon anode both decreased withAl-containing additives adding, while shown a minimum with the amount of Al_4C_3, AlF_3 and Al_2O_3increasing. However, all Al-containing additives increase the airburn reactivity at 550℃ of carbonanodes. Coke yield measurement and XRD examination with aluminum containing additives doped pitchcokes revealed that the effect of Al-containing additives on the airburn reactivity and carboxyreactivity of carbon anode would result from chemical factors and structural factors.

关键词： aluminum electrolysis aluminum-containing additives reactivity carbonanode

Dissolution theory of gold in alkaline thiourea solution(Ⅲ) ——Thermodynamics on dissolution of gold in alkaline thiourea solution containing Na _2SO_3

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中国有色金属学会会刊：英文版 1999年第3期9卷 646-650页

作者： Chai Liyuan(柴立元) 1, Masazumi Okido 2 1. Department of Nonferrous metallurgy, central south university of Technology, changsha 410083, P.R.china 2. Center for Integrated research of Science and Engineering, Nagoya university,Nagoya 464, Japan 中南工业大学有色冶金系湖南长沙 Nagoya university 日本

The oxidants of gold were investigated in an alkaline thiourea solution containing Na 2CO 3, in which Na 2S 2O 8 is a proper oxidant for dissolving gold because of in such homogeneous sulfur system coexisting complex agent, oxidant and stabilizing agent. The thermodynamic analyses were conducted on the dissolving of gold in the alkaline thiourea solution containing Na 2SO 3 by the oxidants oxygen or Na 2S 2O 8. The results show that the possibility of gold dissolution reduces with increasing pH value, while oxygen acts as oxidant; and when Na 2S 2O 8 acts as the oxidant of gold in the alkaline thiourea solution of pH 12.5, decomposition potential of thiourea decreases from the standard value 0.42 V to -0.32 V, also the dissolution trend of gold enhances with shifting the mix potential of the solution to the positive direction.

关键词： thermodynamic analysis gold dissolution thiourea leaching Document code:A

LUBRICATING BEHAVIOR OF COPPER RHENATE AT ELEVATED TEMPERATURES

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中国有色金属学会会刊：英文版 1997年第4期7卷 44-47页

作者： Xiong Dangsheng National Key Laboratory for powder metallurgy, central south university of Technology, changsha 410083

ＬＵＢＲＩＣＡＴＩＮＧＢＥＨＡＶＩＯＲＯＦＣＯＰＰＥＲＲＨＥＮＡＴＥＡＴＥＬＥＶＡＴＥＤＴＥＭＰＥＲＡＴＵＲＥＳ①ＸｉｏｎｇＤａｎｇｓｈｅｎｇＮａｔｉｏｎａｌＫｅｙＬａｂｏｒａｔｏｒｙｆｏｒＰｏｗｄｅｒＭｅｔａｌｕｒ... 详细信息

ＬＵＢＲＩＣＡＴＩＮＧＢＥＨＡＶＩＯＲＯＦＣＯＰＰＥＲＲＨＥＮＡＴＥＡＴＥＬＥＶＡＴＥＤＴＥＭＰＥＲＡＴＵＲＥＳ①ＸｉｏｎｇＤａｎｇｓｈｅｎｇＮａｔｉｏｎａｌＫｅｙＬａｂｏｒａｔｏｒｙｆｏｒＰｏｗｄｅｒＭｅｔａｌｕｒｇｙ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎ...

关键词： copper rhenate high temperature lubrication rubbing pairs

A decomposing technique for scheelite concentrate and low-grade scheelite concentrate

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Rare Metals 2004年第2期23卷 115-119页

作者： HUO Guangsheng SUN Peimei LI Honggui LI Yunjiao ZHAO Zhongwei SUN Zhaoming LIU Maosheng School of metallurgy Science and Engieering, central south university, changsha 410083, china School of metallurgy Science and Engineering Central South University Changsha 410083

The effect of different decomposition conditions on tungsten recovery forscheelite concentrate has been examined. The results show that tungsten recovery can be more than98% under decomposing conditions as follows: the amount of caustic soda is 2.2 and 3.2 times oftheoretical respectively, ratio of water and ore is 0.7-0.8, temperature is 160℃, and preservationtime is 2.0 h for scheelite concentrate (63.21 % WO_3) and low grade scheelite concentrate (55.17%WO_3).

关键词： non-ferrous metallurgy caustic soda digestion scheelite concentrate lowgrade scheelite concentrat