Influence of Microwave and Electron Beam Irradiation on Composition of Aluminum Nanopowder

Mostovshchikov, A. V.; Korshunov, A. V.; Ilyin, Alexander P.; Kalinich, Ivan; Chumerin, P. Yu.

doi:10.4028/www.scientific.net/kem.769.90

Cited by 2 publications

(2 citation statements)

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“…In this regard, in order to simulate thermal processes in metal powders when exposed to microwave radiation, a mathematical apparatus was developed, which is described in detail in the works [ 10 , 14 ]. In addition, it was experimentally found that under the action of short-pulse microwave radiation, metal powders change their thermochemical properties [ 15 , 16 ]. The temperature at the beginning of the oxidation of aluminum powder decreases, the specific heat of oxidation increases, and the degree of oxidation when heated in air increases after exposure to microwave radiation with a frequency of 9.4 GHz and a power density of 80 W/cm 2 [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it was experimentally found that under the action of short-pulse microwave radiation, metal powders change their thermochemical properties [ 15 , 16 ]. The temperature at the beginning of the oxidation of aluminum powder decreases, the specific heat of oxidation increases, and the degree of oxidation when heated in air increases after exposure to microwave radiation with a frequency of 9.4 GHz and a power density of 80 W/cm 2 [ 15 ]. On the other hand, it was shown that with an increase in the duration of microwave pulses and irradiation time, the thermal heating and annealing of the protective oxide shell on the surface of aluminum particles occur, which leads to a decrease in the specific thermal effect of oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Short-Pulse Microwave Radiation on Thermochemical Properties Aluminum Micropowder

et al. 2023

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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/cm2, 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.

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