Application of the Method of Evaporation of a Substance by High-Energy Electron Beam to Produce Tungsten Nanopowder

Abstract

The method of producing nanopowder by evaporation by a high-energy electron beam has a great potential for refractory substances, since the electron beam makes it possible to obtain high the power density in the interaction spot is not more than 3-4 cm² and, as a result, high temperature gradients. The accelerator and electron beam have a high efficiency of transferring energy from the power grid to evaporation (up to 70 %). The electron beam does not introduce pollution and is not selective to the material. Work specifics with an electron accelerator is associated with radiation caused by electron deceleration and high temperatures. These phenomena greatly complicate the monitoring of processes occurring in the evaporation zone. Therefore, at present, the method requires development and adaptation to specific materials. In this work, we studied the process of obtaining nanosized tungsten powder by the indicated method. Experiments were tested that allow obtaining data on the processes of nanopowder synthesis by calorimetry of the evaporation zone and measurements of the radiation level near it. The technology was developed and the parameters of the obtained tungsten nanopowders were determined. Showing ways to increase productivity This method is applied to tungsten.