The Application Of The Composite Material Preparation And The Inclusion Separating By Electromagnetic Separation Technology

Electromagnetic separation is widely applied to the removal of slag inclusion and the preparation of composite material, which was raised and developed in the last80s. The ultimate principle of electromagnetic separation is that metal melt and heterogeneous phase is separated by the electromagnetic repulsive force which is produced as the difference of conductibility between metal melt and heterogeneity in electromagnetic field. The preparation of Zn-27%Al-3%Si gradient composite and separating the slag inclusion from metal melt using electromagnetic separation are researched in this paper.The primary precipitated phase silicon in Zn-27%Al-3%Si alloy is moved from the centre to the edge using high frequency electromagnetic field to make gradient composite in which the silicon is gradient distributing. The technological parameter of gradient composite is researched and mechanical behavior of composites is tested. The experimental results indicate that separation temperature, magnetic field intensity and separation time greatly influence the silicon distribution in the alloy; When the separation temperature is520°C, magnetic field intensity is40mT and separation time is30seconds, a great quantity of silicon phases which are moved from the centre gather and grow up at the edge and there are not many leading precipitated silicon phases but a few eutectic silicon phases at the centre; The silicon content becomes more and more from the centre to the edge. While the silicon content is about0.5%at the centre, the silicon content is more than6.4%near edge; accordingly, the microhardness of alloy becomes larger from the centre to the edge. The microhardness at the edge is about132HV. more than50%at the centre. After the electromagnetic separation, the wear-resisting property of alloy at the edge is much better than the centre, but the wear-resisting property becomes litter worse than before the electromagnetic separation.The Zn-4.5%A1liquid is added Fe to model the cadmia of hot galvanizing melt which is researched using high frequency electromagnetic field. The separation effect for hot galvanizing melt under different separation time and magnetic field intensity is investigated. The results indicate that:the separation effect firstly becomes better then becomes worse with the magnetic field intensity increasing; when other factors are changeless, the separation effect becomes better with the separation time increasing, but when the separation effect reaches the best, the separation effect will become worse with the time increasing. When the separation temperature is450°C. magnetic field intensity is60mT, separation time is10seconds, the separation effect is the best so that the cadimia phases get together at the edge while there are no cadimia at the centre.The electromagnetic separation of oxide inclusions from copper alloy is also studied. When the separation temperature is1000°C, magnetic field intensity is40mT. separation time is60seconds, the separation effect is the best...