Mostovshchikov Andrei, Gubarev Fedor, Nazarenko Olga, Pestryakov Alexey
School of Core Engineering Education, Tomsk Polytechnic University, Tomsk 634050, Russia.
Department of Physical Electronics, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634034, Russia.
Materials (Basel). 2023 Jan 19;16(3):951. doi: 10.3390/ma16030951.
The thermochemical properties of Al micropowder after exposure to microwave irradiation were investigated. The Al micropowder was exposed to microwave irradiation in air with a frequency of 2.85 GHz, a power density of 8 W/cm, and a pulse duration of 25 ns and 3 µs. The thermochemical parameters of the irradiated metal powders were determined by the method of thermal analysis at the heating in air. It was found that an increase in the duration of microwave pulses and irradiation time leads to the thermal annealing of the metal particles, and the thermal processes of melting and sintering begin to dominate over non-thermal processes. The specific thermal effect of irradiated Al micropowder oxidation increases from 7744 J/g to 10,154 J/g in comparison with the unirradiated powder. The modeling of thermal heating processes of aluminum (Al) micropowder under the action of pulsed microwave radiation has been performed. It is shown that with an increase in the duration of microwave pulses and irradiation time, a significant heating of the Al micropowder occurs, leading to its melting and sintering. The results of modeling on the action of microwave radiation on the Al micropowder were compared with experimental results.
研究了铝微粉在微波辐照后的热化学性质。铝微粉在空气中以2.85 GHz的频率、8 W/cm的功率密度以及25 ns和3 μs的脉冲持续时间进行微波辐照。通过在空气中加热时的热分析方法测定辐照金属粉末的热化学参数。发现微波脉冲持续时间和辐照时间的增加会导致金属颗粒的热退火，并且熔化和烧结的热过程开始超过非热过程。与未辐照的粉末相比，辐照铝微粉氧化的比热效应从7744 J/g增加到10154 J/g。对脉冲微波辐射作用下铝（Al）微粉的热加热过程进行了建模。结果表明，随着微波脉冲持续时间和辐照时间的增加，铝微粉会发生显著加热，导致其熔化和烧结。将微波辐射对铝微粉作用的建模结果与实验结果进行了比较。
