基于定义磁流体密度条件下的磁场量化分析

阐述了磁场是某种物质,当切割磁场时,摩擦产生电。采用了磁流体密度解释了导线通电磁场作用现象,定义出磁流体密度这个概念,利用此概念对磁场进行量化分析。

超高密度水基Fe_3O_4磁流体的制备及其性能表征

超高密度磁流体在航天、密封、矿物浮选领域有广阔的应用前景。采用化学共沉淀法经分离基液制备了超高密度Fe3O4水基磁流体。以XRD、TEM、振动样品磁强计（VSM）、旋转黏度计等对样品进行了表征。研究表明：高密度磁流体Fe3O4为反尖晶石型结构，平均粒径约15nm，其磁饱和黏度值、黏度变化域值、饱和磁化强度分别可达5．64Pa·S、0．82-5．64Pa·S、51．2emu·g^-1，分别是普通磁流体的564倍、60倍、7倍；饱和磁化强度随磁微粒含量的变化呈显著的线性相关性；当温度在20—80℃变化时，超高密度磁流体密度在4．9852-4．9827g·cm^-3，且与温度的变化基本无关。

Mathematical modeling of electromagnetic dimensionless number for electromagnetic casting of metals and its application

In order to estimate the feasibility of electromagnetic casting (EMC) for different metals, a mathematical model named the electromagnetic dimensionless number (EMDN) was presented, and its validity was proved by the experiments of aluminum and Sn-3%Pb alloy. From the experiment and the analysis of EMDN it can be concluded that the EMC of steel can be attained only when the magnetic flux density is larger than 0.09T, while that required for aluminum is only 0.04T. The mathematical expression of the electromagnetic dimensionless number was given out.