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FORMING OF PARTICLES REINFORCED METAL MATRIX COMPOSITES bYCASTING UNDER COUNTER GRAVITY

J.M.Zeng1) and Y.H.Zhou2) 1) Guangxi University , Nanning 530004 , China 2) ShanghaiJiao Tong University , Shanghai200030 , China

金属学报(英文版)

Dynamiccharacteristicsof forming of particlesreinforced metal matrix compositesbycastingunder counter gravityareanalyzedinthispaper.Itispointed outthatthereexists much dif ferenceinfluiditybetweenthecompositesandthe matrix alloyduetothedifferencein viscosityandequivalentsolidification latent. Filling capability can be greatly improved by adoptingcounter gravity process, andthin walled precision castingscan beshaped .

关键词: particlesreinforced metal matrixcomposites , null , null

ELECTRONIC STRUCTURE AND PHYSICAL PROPERTIES OF FeAl

Y.J.Gao and X.P.Zhong Departmentof physics , Guangxi University , Nanning 530004 , China

金属学报(英文版)

Theelectronicstructureof FeAlisdetermined byone cell state method andthepotentialenergy curve,lattice constant, cohesive energy, bulk elastic module, and the variation of linear thermalexpansion coefficient with temteraturearecalculated.

关键词: FeAl , null , null , null

THE RANGE OF AMORPHOUSFORM FOR Fe- Mo SYSTEM BY MECHANICAL ALLOYING

X.P.Zhong , Y.F.Ouyang , H.M. Cheng and W.M.Wu Departmentof Physics , Guangxi University , Nanning 530004 , China

金属学报(英文版)

Mechanicalalloyingof Fex Mo1 x( x = 0 2 0 9) with blend elements Fe and Mo powders havebeen performedina highenergyplantball. Theresultsindicatedthatthesolubilityof Fein Moor Moin Feis morethen 20at.% andthecomposition x ofamorphousofthissystem is in therangeof0 4 0 7 . Accordingtothethermodynamicpropertiesfortheamorphousformofalloys,thecomposition range of amorphous form for Fe Mosystem hasbeen investigatedwith Miedematheory. Thetheoreticalresults arein reasonable with experimental data.

关键词: mechanicalalloying , null , null , null

Reduction of low-grade manganese oxide ore by biomass roasting

Jingjing SONG

金属学报(英文版)

The reduction process of manganese dioxide in low-grade manganese ore by biomass roasting was investigated. The calcine of manganese oxide ore was further leached by sulphuric acid, the manganese in ore can be converted into manganese sulfate. Effects of the mass ratio of manganese ore to sawdust, roasting temperature and time, leaching temperature and time, leaching agent concentration and liquid-solid ratio were studied. 97.71 % of manganese recovery can be achieved under the optimal conditions: the mass ratio of manganese ore to sawdust of 5:1, roasting temperature at 500 ℃ for 40 min, leaching temperature at 60 ℃ for 40 min, sulphuric acid concentration of 1 mol/L and liquid-solid ratio of 10:1. Other types of low-grade manganese ore like Guilin ore, Nanning ore and Gongcheng ore were tested and the same results were obtained.

关键词: Reduction roasting , biomass , sawdust , reduction roasting

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