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Исследование составов металлогазовых смесей для получения нанодисперсного оксида алюминия

Исследование составов металлогазовых смесей для получения нанодисперсного оксида алюминия

Abstract

It is considered the processes occurring in a prechamber of experimental-industrial plant for burning of gas suspension of metallic powders and synthesis of disperse oxides. The most significant factors to obtain the nanooxide of aluminum in experimental-industrial plant, such as temperature of primary combustion products, a fraction of the condensed and gaseous phase of the aluminum, formed in a prechamber are described. Take into account of these factors, the components promoting improvement of process of synthesis and quality of nanooxide of aluminum have been chosen. It was investigated burning metalgas mixtures containing inert components in relation to aluminum: Al + O 2 + H 2, Al + O 2 + He, Al + O 2 + Ar. For comparison it is considered applied earlier mixture of Al + air. Thermodynamic calculations have been carried out, the structure of combustion products of studied metalgas mixtures and the content of the condensed phase in a mixture have been determined. The curves of dependence of a total share of the condensed phase, temperatures and fraction of aluminum in the condensed phase on excess oxidant ratio have been constructed. Comparison of the mixtures containing inert components, with mixture of Al + air has been carried out. It has been revealed the reduction of mass fraction of the condensed phase in 2–3 times, fraction of aluminum in the condensed phase in 3–6 times and temperatures of combustion products more than by 200 K. Economic integrity of use of mixtures has been considered. The conclusion on the base of investigation results was made: for production of nanooxide of aluminium the best substance is Al + O 2 + Ar mixture.

Рассматриваются процессы, протекающие в форкамере опытно-промышленной установки сжигания газовзвесей металлических порошков и синтеза дисперсных оксидов. Описаны наиболее значимые факторы, влияющие на получение нанооксида алюминия в опытно-промышленной установке, такие как температура продуктов первичного горения, доли конденсированной и газообразной фазы алюминия, образованные в форкамере. С учетом влияния этих факторов подобраны компоненты, способствующие улучшению процесса синтеза и качества нанооксида алюминия. Исследованы горючие металлогазовые смеси, содержащие инертные по отношению к алюминию компоненты: Al + O 2 + H 2, Al + O 2 + He, Al + O 2 + Ar. Для сравнения рассмотрена применяемая ранее смесь Al + воздух. Проведены термодинамические расчеты, определен состав продуктов сгорания исследуемых металлогазовых смесей и содержание конденсированной фазы в смеси. Построены графики зависимости суммарной доли конденсированной фазы, температуры и доли алюминия в конденсированной фазе от коэффициента избытка окислителя. Проведено сравнение смесей, содержащих инертные компоненты, со смесью Al + воздух и выявлено снижение массовой доли конденсированной фазы в 2–3 раза, доли алюминия в конденсированной фазе в 3–6 раз и температуры продуктов сгорания более чем на 200 К. Рассмотрена экономическая целесообразность использования смесей. По результатам исследований сделан вывод, что для производства нанооксида алюминия лучше всего использовать смесь Al + O 2 + Ar.

Keywords

НАНООКСИД, МЕТАЛЛОГАЗОВАЯ СМЕСЬ, ОПЫТНО-ПРОМЫШЛЕННАЯ УСТАНОВКА, ФОРКАМЕРА, ОХЛАЖДЕНИЕ, КОНДЕНСИРОВАННАЯ ФАЗА, ДОЛЯ АЛЮМИНИЯ В ГАЗООБРАЗНОМ СОСТОЯНИИ, СООТНОШЕНИЕ РАСХОДА КОМПОНЕНТОВ

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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