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PREPARATION OF ULTRAFINE ALUMINA powderS BY ALUMINUM ISOPROPOXIDE

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中国有色金属学会会刊：英文版 1994年第2期4卷 21-24页

作者： Yu,Zhongqing Zhao,Qinsheng Zhang,Qixiu(Department of Nonferrous metallurgy,central south university of Techonology,changsha 410083)

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ＰＲＥＰＡＲＡＴＩＯＮＯＦＵＬＴＲＡＦＩＮＥＡＬＵＭＩＮＡＰＯＷＤＥＲＳＢＹＡＬＵＭＩＮＵＭＩＳＯＰＲＯＰＯＸＩＤＥＰＲＥＰＡＲＡＴＩＯＮＯＦＵＬＴＲＡＦＩＮＥＡＬＵＭＩＮＡＰＯＷＤＥＲＳＢＹＡＬＵＭＩＮＵＭＩＳＯＰＲＯＰＯＸＩＤＥ￥Ｙｕ，Ｚｈｏｎｇ...

关键词： aluminum Isopropoxide alumina ultrafine powders hydrolysis calcination

Densification Mechanism of Warm Compaction and powder Mixture Designing Rules

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Journal of central south university 2000年第1期12卷 4-6页

作者： CAO Shun hua,HUANG Bai yun,QU Xuan hui,YI Jian hong(State Key Laboratory for powder metallurgy, central south university of Technology, changsha 410083, China) 1. State Key Laboratory for powder metallurgy Central South University of Technology 410083 Changsha China

By phenomenological analysis of warm compaction, it is found that, compared with the contribution of particle plastical deformation to densification of powder compact,the particle rearrangement is a dominant densification mechanism for powder warm compaction, and the plastical deformation of particles plays an important role in offering accommodating deformation for particle rearrangement and densifying powder compact at the final stage of *** order to attain density gain as high as possible during warm compaction, six rules for designing warm compacting powder mixtures were proposed in detail.

关键词： warm compaction densification mechanism powder mixture designing rule

COMPUTER MODEL OF COPPER SMELTING PROCESS AND DISTRIBUTION BEHAVIORS OF ACCESSORY ELEMENTS

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Journal of central south university 1997年第1期9卷 36-41页

作者： Tan Pengfu Zhang Chuanfu(Department of Nonferrous metallurgy. central south university ofTechnology, changsha 410083, China) Department of Nonferrous metallurgy Central South University of Technology Changsha 410083 China

A computer model has been developed to simulate the distribution behaviors of Ni, Co. Sn. Ph,Zn, As, Sb, Bi, An and Ag in copper smelting process. The model assumes that the copper smelting furnaceis in thermodynamic equilibrium. As many as 21 elements (Cu. S, Fe. Ni, Co. Sn, As, Sb. Bi, Ph. ***. Ag. O, N, C, H, Ca, Mg, Al, and St) and 73 compounds are considered. This model accounts forphysical entrainment in the melts. The predictions by the present computer model are compared with theknown commercial data from Guixi Smelter in China, Home Smelter in Canada and Naoshima Smelter inJapan. The agreements between the computer predictions and the commercial data are excellent, so that thepresent computer model can be used to monitor and optimize the actual industrial operations of copper smelting. It is applicable to simulation of almost all copper pyrometallurgical processes.

关键词： simulate distribution behaviors copper smelting computer model

Properties of Hot-Pressed Al_2O_3-Fe Composites

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Journal of Materials Science & Technology 2001年第5期17卷 538-542页

作者： M.M.El-Sayed Seleman, Xudong SUN and Liang ZUO Department of Materials Science and Engineering, Northeastern university, Shenyang 110006, China K.A.Khalil powder metallurgy institute, central south university, changsha 410083, China Northeastern Univ Dept Mat Sci & Engn Shenyang 110006 Peoples R China Cent S Univ Powder Met Inst Changsha 410083 Peoples R China

Alumina-(0 similar to 20 vol. pct) iron composites were fabricated by hot-pressing of well-mixed-alumina and iron powders at 1400 degreesC and 30 MPa for 30 min. Hot-pressed bodies with nearly theoretical density were obtained for addition up to 10 vol. pct Fe, but relative density decreased gradually with further increase in Fe addition. The materials exhibit a homogeneous dispersion of Fe. Fracture strength of the composites exhibits a maximum value of 604 MPa at 15 vol. pct Fe, which is 1.5 times that of alumina alone. Fracture toughness increases with the increase in Fe content, reaching 7.5 MPa.m(1/2) at 20 vol. pct Fe. The theoretical values of fracture toughness was calculated and compared with the experimental one. Toughening mechanisms of the composites are also discussed.

关键词： Fe Properties of Hot-Pressed Al2O3-Fe Composites Al

SYNTHESIS OF Ti-47Al-2Cr-2Nb ALLOY THROUGH ELEMENTAL powder metallurgy

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中国有色金属学会会刊：英文版 1998年第4期8卷 39-44页

作者： Liu Yong, Huang Baiyun and He Yuehui powder metallurgy research institute, central south university of Technology, changsha 410083, P. R. China

ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｂａｓｅａｌｏｙｓｈａｖｅａｔｒａｃｔｅｄｍｏｒｅａｎｄｍｏｒｅａｔｅｎｔｉｏｎｂｙｔｈｅｉｒｈｉｇｈｓｐｅｃｉｆｉｃｓｔｒｅｎｇｔｈ，ｓｐｅｃｉｆｉｃｒｉｇｉｄｉｔｙａｎｄｅｘｃｅ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＴｉＡｌｂａｓｅａｌｏｙｓｈａｖｅａｔｒａｃｔｅｄｍｏｒｅａｎｄｍｏｒｅａｔｅｎｔｉｏｎｂｙｔｈｅｉｒｈｉｇｈｓｐｅｃｉｆｉｃｓｔｒｅｎｇｔｈ，ｓｐｅｃｉｆｉｃｒｉｇｉｄｉｔｙａｎｄｅｘｃｅｌｅｎｔｐｒｏｐｅｒｔｉｅｓａｔｅ...

关键词： elemental powder metallurgy TiAl base alloys synthesis

DISSOLUTION THEORY OF GOLD IN ALKALINE THIOUREA SOLUTION(Ⅱ)——Electrochemical Study on Au-Fe Mix Anode 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2期9卷 189-194页

作者： Chai Liyuan1 and Masazumi Okido2 1 Department of Nonferrous metallurgy,central south university of Technology, changsha 410083, P. R. China2 Center for Integrated research in Science and Engineering,Nagoya university, Nagoya 464, Japan 中南工业大学有色冶金系湖南长沙 Nagoya Univerisity 日本

１ＩＮＴＲＯＤＵＣＴＩＯＮＭａｎｙｓｔｕｄｉｅｓｏｎｔｈｅｅｘｔｒａｃｔｉｏｎｏｆｇｏｌｄｆｒｏｍｏｒｅｏｒｓｃｒａｐｗｉｔｈｔｈｉｏｕｒｅａｗｅｒｅｒｅｐｏｒｔｅｄ［１－３］，ｂｕｔａｌｔｈｏｓｅｗｅｒｅｌｉｍｉｔ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＭａｎｙｓｔｕｄｉｅｓｏｎｔｈｅｅｘｔｒａｃｔｉｏｎｏｆｇｏｌｄｆｒｏｍｏｒｅｏｒｓｃｒａｐｗｉｔｈｔｈｉｏｕｒｅａｗｅｒｅｒｅｐｏｒｔｅｄ［１－３］，ｂｕｔａｌｔｈｏｓｅｗｅｒｅｌｉｍｉｔｅｄｏｎｌｙｉｎａｃｉｄｉｃｍｅｄ...

关键词： alkaline thioureasodium sulfitemix anode of gold and iron

Biocompatibility evaluation in vitro. Part II: Functional expression of human and animal osteoblasts on the biomaterials

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Journal of central south university of Technology 2001年第2期8卷 75-82页

作者： RUAN Jian ming 1,GRANT M. Helen 2 (1.State Key Laboratory for powder metallurgy, central south university, changsha 410083, China 2.Bioengineering Unit, Strathclyde university, Glasgow, G4 0NW, UK) 1. State Key Laboratory for powder metallurgy Central South University 410083 Changsha China 2. Bioengineering Unit Strathclyde University G4 0NW Glasgow UK

DNA synthesis and collagen formations on the implant material by cell culture in vitro are the most important phenotypical expression to estimate the biocompatibility. In this part, DNA synthesis and collagen formation on implant materials were quantitatively and qualitatively estimated by radioactive isotope H + thymidine to incorporate into DNA chains, H + proline to incorporate into type I collagen proteins followed by scin tillation counting and antibody antigen immunocytochemistry staining, respectively. research results demonstrate that hydroxyapatite (HA) stimulates DNA synthesis and collagen formation on the material whereas this stimulation is restricted by adding spinel to the materials. There are statistical differences between the influences of material components on both DNA synthesis and collagen formation. It is supposed that porous materials can supply more platforms for cell anchoring, and more DNA and collagen are synthesised on the porous materials. Immersion in culture medium results in new HA crystal formation on the porous HA materials.

关键词： biocompatibility DNA synthesis collagen protein incorporation

SELECTION OF DILUENTS FOR COPPER EXTRACTION FROM OIL PRODUCTS

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Journal of central south university 1998年第1期10卷 36-38页

作者： Luo Aiping Zhang Qixiu(Department of Nonferrous metallurgy, central south university of Technology,changsha 410083,China) Department of Nonferrous metallurgy Central South University of Technology Changsha 410083 China

A series of oil products taken from oil refining factories were used as diluents for copper extraction. The influence of diluents on extraction properties has been investigated. The extractants used are Lix984(Henkel) and M5640(Zeneca), and the adaptability of this diluents to these extractants is compared. The checked extraction properties include loading capacity, extraction and strip kinetics, copper/iron selectivity and phase disengagement. The results showed that DSR3 is a suitable diluent for M5640 and Lix984. Further research has been done to reduce the cost of this product by omitting several steps from its production process.

关键词： solvent extraction diluent copper

Possibility of utilizing water-atomized Fe-Ni-Mo steel powder as base materials for warm compaction process

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Journal of central south university of Technology 2001年第4期8卷 219-223页

作者： CAO Shun hua,QU Xuan hui,ZHANG Li hua, YI Jian hong,HUANG Bai yun (State Key Laboratory for powder metallurgy, central south university,changsha 410083, China) 1. State Key Laboratory for powder metallurgy Central South University 410083 Changsha China

Water atomized Fe Ni Mo steel powder, was utilized as base powder for designing powder mixtures for warm pressing. The warm pressing and sintering behaviours of the powder mixtures were studied. The results show that, compared with the pressing at room temperature, the green density gain by warm pressing is within a range of 0.10 0.19 g/cm 3 and reduction in spring back is 30% 40% of the ambient, and maximum green density of 7.32 g/cm 3 at 735 MPa is obtained as the graphite mass fraction is 0.8%. It was found that sintered densities of the compacts were reduced slightly due to releasing of elastic stress stored in the compacts during sintering. The warm pressing of steel powders gives evidence for substituting the traditional double pressing and double sintering process.

关键词： water atomized steel powder warm compaction sintering