Abstract

The peculiarities of the process of preparation of metal oxide nanopowders by the evaporation–condensation method with pulsed heating of the material by focused subterahertz radiation are described. It is shown experimentally that the optimal conditions for the rapid evaporation of a substance are achieved at the highest possible pulse power and the largest possible duty cycle at a fixed average power. Under these conditions, it is possible to heat and evaporate the substance with a focused radiation beam in a relatively short time, so that the adjacent layers of the evaporated substance are not warmed and fused and a relatively low thermal conductivity is maintained. A linear increase in the evaporation rate with an increase in the duty cycle of the heating pulses is revealed, and this increase reaches the fivefold value relative to the continuous heating mode.

中文翻译：

---

在金属氧化物纳米粉体生产中通过传热振子回旋辐射的脉冲加热的特殊性

摘要

描述了通过蒸发-冷凝法制备金属氧化物纳米粉末的过程的特殊性，并通过聚焦的太赫兹辐射对材料进行了脉冲加热。实验表明，在固定的平均功率下，以最大可能的脉冲功率和最大可能的占空比实现了物质快速蒸发的最佳条件。在这些条件下，可以在较短的时间内用聚焦的辐射束加热和蒸发该物质，从而使蒸发的物质的相邻层不被加热和熔化，并保持较低的导热率。蒸发速率随加热脉冲占空比的增加而线性增加，