Development of Atomized Ni-based Powder by Counterrotating Process

最近，已经公布了各种快速凝固技术的方法。然而，这些报道的方法面临各种问题（污染、低密度、不规则形状、非常高速的旋转）。我们已经开发了一种新的雾化方法，其具有这样的机构，其中封闭熔融金属的坩埚和冷却盘围绕垂直同轴线沿相反方向旋转。这个过程是所谓的离心雾化方法之一。本研究的目的是确定由该方法生产的粉末性质。采用声波筛和电磁筛对粉体进行粒度分析。分别利用扫描电子显微镜和光学显微镜确定颗粒形状和颗粒结构，并通过图像分析仪测量颗粒的圆度。用实验室规模的实验装置制备了Fe_<82>+B_<18>、高温合金、Pb-Sn及各种材料的球形和表面光滑的颗粒，平均直径约为38 ~ 120 μ m，以及形成非晶相或准晶相（Fe_<82>-B_<18>）的颗粒。

Recently, various methods of rapid solidification techniques have been published. However, these reported processes face various problems(contamination, low density, iregular shape, very high speed rotation).To solve these problems. we have developed a new atomization process which has a mechanism where a crucible enclosing the molten metal and a cooling disk rotate in opposite directions about a vertical coaxial. This process is one of the so-called centrifugal atomization methods. the pur-pose of this investigation is to define the powder property which is produced by this process. The size analysis of powders was conducted by sonic sieve and electro-magnetic sieve analysis. a scanning electron microscope and an optical microscope were utilized to ascertain particle shape and particle structure, respectively, and the roundness of particles was measured by a image analyzer. Spherical and smooth surfaced particles of Fe_<82>+B_<18>, super-alloy ,Pb-Sn and various materials with an average diameter of about 38 120 m, and the particles to get amorphas or metas-table phases(Fe_<82>-B_<18>) were produced by laboratory-scaled experimental ap-paratus.