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Размерная зависимость параметров структуры частиц электровзрывных порошков металлов

Размерная зависимость параметров структуры частиц электровзрывных порошков металлов

Abstract

С использованием методов рентгеноструктурного анализа и просвечивающей электронной микроскопии высокого разрешения исследована структура оксидной оболочки и металлического ядра частиц электровзрывных порошков металлов Al, Cu, Fe, Ni, Mo, W. Проанализировано влияние состояния оксидной оболочки и ее фазового состава на защитную функцию по отношению к окислению частиц металлов при хранении. Показано, что в случае больших значений соотношения молярных объемов поверхностного кристаллического оксида и металла оксидная оболочка не образует сплошного контакта с металлом и не предотвращает полного окисления частиц наноразмерного диапазона. Установлено, что параметр элементарной ячейки частиц металлов с диаметром 20 нм и более не является размерно&зависимой величиной и в пределах погрешности измерений принимает значения, свойственные металлам в массивном состоянии. Показано, что размерная зависимость проявляется в особенностях дефектности структуры частиц различного размерного диапазона, предложено объяснение наблюдаемой зависимости, учитывающее различие температурных условий формирования частиц порошков.

The author studies the structure of oxide shell and particle metal core of electroexplosive powders of Al, Cu, Fe, Ni, Mo, W metals using the techniques of X-ray diffraction and high-resolution transmission electron microscopy. The influence of oxide shell state and its phase composition on protective function relative to metal particle oxidation at storing is analyzed. It is shown that in case of high values of molar volume ratio of surface crystal oxide and metal the oxide shell does not form continuous contact with metal and does not prevent full oxidation of nanoscale range particles. It is ascertained that the parameter of metal particle elementary cell with the diameter of 20 nm and more is not a dimension-dependent magnitude and takes the values common for solid state metals within the measurement accuracy. It is shown that size dependence occurs in features of structure faults of different size range particles. The author proposes the explanation of the observed dependence which considers the difference in temperature conditions of powder particles formation.

Keywords

МЕТАЛЛЫ, ЭЛЕКТРОВЗРЫВНЫЕ ПОРОШКИ, НАНОЧАСТИЦЫ, СТРУКТУРА, РЕНТГЕНОСТРУКТУРНЫЙ АНАЛИЗ, ЭЛЕКТРОННАЯ МИКРОСКОПИЯ ВЫСОКОГО РАЗРЕШЕНИЯ

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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