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Влияние концентрации наночастиц SiO2 в электролите на состав и свойства оксидных слоев, формируемых плазменно-электролитическим оксидированием на силумине АК7

А. В. Полунин, Е. Д. Боргардт, А. О. Черетаева, А. В. Кацман, М. М. Криштал

Аннотация


Исследовано влияние добавок в щелочно-фосфатно-силикатный электролит наночастиц SiO2 (средний размер 100 нм, концентрация 0,3 и 3 г/л) на характеристики оксидного слоя, формируемого плазменно-электролитическим оксидированием (ПЭО) на силумине АК7. Выявлен нелинейный характер влияния концентрации наночастиц на фазовый состав, долю аморфной фазы, характеристики кристаллитов (размер и микронапряжения), а также на толщину слоя, твердость, износостойкость и антикоррозионные характеристики оксидных слоев. Наименее дефектный и наиболее толстый слой, а также наиболее высокие защитные свойства, износостойкость и твердость наблюдаются у оксидных слоев, полученных при концентрации нанопорошка в электролите 0,3 г/л. Для этих же слоев характерна минимальная доля аморфной фазы и наибольший размер кристаллитов муллита.

Ключевые слова


плазменно-электролитическое (микродуговое) оксидирование; алюминиево-кремниевый сплав (силумин); диоксид кремния; наночастицы; микронапряжения; твердость; износостойкость; коррозионная стойкость

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Литература


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DOI: https://doi.org/10.30906/mitom.2022.11.18-31

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