用电磁力模拟空间微重力效应制备二元偏晶合金

提出了一种在地面利用电磁场与金属熔体的相互作用来模拟失重效应的方法。探讨了实现准失重环境的可能性,建立了准失重模拟装置。并成功地制备了均匀的Pb-Zn二元偏晶合金样品。实验结果表明,用此方法进行微重效应模拟可消除重力造成的斯托克斯(Stokes)沉积,制备的Pb-Zn二元偏晶合金中的弥散体(Pb)分布均匀,铅粒子的形状主要为微米量级的小球。与我们在我国返回式实验卫星上搭载的Pb-Zn合金样品相比较,其弥散体的分布状况无大的差异,只是前者弥散体尺寸略大于空间样品。然而,用该方法在准失重条件下制备的样品,无论在弥散体大小和均匀程度方面都与地面普通条件下(受重力影响)的样品有本质的区别。

PROCESS OF BINARY MONOTECTIC ALLOY UNDER SIMULATED MICROGRAVITY EFFECT BY ELECTROMAGNETIC FORCE

A new method, by which weightless effect can be got by the interaction between electromagnetic force and molten metal, has been put forward in this paper.The equipment to simulate the weightlessness has been built, and Pb-Zn binary alloy with a uniform distribution of fine dispersion particles has been also prepared successfully.The experimental results indicated that the stokes migration induced by difference of specific gravity between two liquid phases can be reduced to the lowest level by the method, and homogeneously distributed Pb particles in the shape of micron-scale ball in the prepared binary monotectic Pb-Zn alloy bear a resemblance to the dispersion distribution of Pb,comparing with the piggyback Pb-Zn alloy on the chinese recoverable Satellite for microgravity experiments, only the size of formers is a little larger than the latter's. However, the sample obtained by the simulation method is intrinsically different from the terrestrial sample both in s(?)ze of dispersion and in homogeneity.