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THE EXTRACTED COMPLEX FORMED BY MONO (2-ETHYLHEXYL)-2-ETHYLHEXYL PHOSPHATE WITH DIVALENT Mn

HUANG Kelong , SHU Wanyin , DING Dunhuang , LIU Guogen , DONG Ping , Central South University of Technology , Changsha , China HUANG Kelong , Lecturer , Department of Chemistry , Central South University of Technology , Changsha 410083 , China

金属学报(英文版)

In order to clarify the mechanism and the complex formed in the extraction of divalent Mn by alkylphosphonic acid monoester, the solid complex has been prepared by mono (2-ethylhexyl)-2-ethylhexyl phosphate, HEH(EH)P, HA with divalent Mn. The elemental analysis, magnetic susceptibility and thermogravimetry have been determined for the solid complex of HEH(EH)P-Mn(II) and the infrared spectrum has been carried out in comparison to the extractant HEH(EH)P. The extracted compound has also been studied by electronic and electron spin resonance spectroscopy in octane solvent and solid state at room temperature. On the basis of the measurements, it is concluded that the structure of the solid polymeric species MnA_2 is in a tetrahedral arrangement.

关键词: solvent extraction mono (2-ethylhexyl)-2-ethylhexyl phosphate , null , null

Grain Refiner for TiAl Intermetallic Compounds

Yuehui HE , Yexiang LIU , Baiyun HUANG , Xuanhui QU and Changming LEI (Powder Metallurgy Research Institute , Central South University of Technology , Changsha , 410083 , China)

材料科学技术（英文）

The effect of BN addition on the grain size and rnechanical properties of Ti-34.1 wt-%Al alloy was investigated. It has been found that BN is an effective grain refiner for TiAl base alloys, The addition of a small arnount of BN to TiAl can change the coarse columnar grains of as-cast rnicrostructure into the fine equiaxed grains. It has been also determined that Ti-34.1 wt-%Al-1.0 wt-%BN alloy has better mechanical properties and microstructure

关键词:

A Study on Synthesis Kinetics of YBa_2Cu_3O_x High Tc Superconductor Powder

TAN Aichun P/M Research Institute , Central-South University of Technology , Changsha , China.

材料科学技术（英文）

The synthesis kinetics of YBa_2Cu_30_x supercon- ductor was studied through comparing the calcina- tion (sintering) processes of different kinds of powders. It was shown that the temperature of synthesis of YBa_2Cu_30_x phase can be lowered from 950℃ to 800℃ through direct calcination of multiphase powder with uniform chemical com- position. The stress which is caused by the volume change during synthetic reaction breaks the particles. It facilitates the formation of highly active superfines of superconductor.

关键词: High T_c superconductor , null , null , null

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