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Формирование и исследование многослойных композиционных плазменных оксидных покрытий на элементах экранной противометеорной защиты

Формирование и исследование многослойных композиционных плазменных оксидных покрытий на элементах экранной противометеорной защиты

Abstract

The paper presents results of research for influence of plasma jet parameters (current, spraying distance, plasma-supporting nitrogen gas consumption), fractional composition of an initial powder and cooling degree by compressed air on characteristics of anti-meteorite coatings, subsequent processing modes by pulsed plasma. Properties of the obtained coatings and results of ballistic tests have been given in the paper. The proposed methodology has been based on complex metallo-graphic, X-ray diffraction and electron microscopic investigations of anti-meteorite aluminum oxide coating. Optimization of air plasma spraying parameters for NiAl and Al2O3 materials has been carried out in the paper. The spraying parameters optimiza-tion has been executed on the basis of obtaining maximum materials utilization factor. Surface treatment of model screen elements with a double-layer composite coating (adhesive metal NiAl layer and hard ceramic oxide Al2O3 layer) has been fulfilled while using compression plasma stream. Nitrogen has been used as working gas. Composite hard ceramic oxide Al2O3 coating is represented by porous structure consisting of 10–15 μm-size fused Al2O3 particles. Metallic inclusions formed due to erosion of plasmatron electrodes have been observed in the space between the particles. Surface of bilayer composite coatings has been processed by a compression plasma stream and due to nonsteady processes of melting and recrystallization high strength polycrys-talline layer has been formed on their surface. In this context, those areas of the polycrystalline layer which had metal inclusions have appeared to be painted in various colors depending on chemical composition of the inclusions.

Представлены результаты исследования влияния параметров плазменной струи (ток, дистанция напыления, расход плазмообразующего газа азота), фракционного состава исходного порошка и степени охлаждения сжатым воздухом на характеристики антиметеорных покрытий, режимы последующей обра-ботки импульсной плазмой. Приведены свойства полученных покрытий и результаты баллистических испытаний. Предлагаемая методика основана на комплексных металлографических, рентгеноструктур-ных и электронно-микроскопических исследованиях антиметеорного покрытия на основе оксида алюми-ния. Осуществлена оптимизация параметров плазменного напыления на воздухе для материалов NiAl и Al2O3. Оптимизацию параметров напыления проводили на основании получения максимального коэф-фициента использования материала. Выполнена обработка поверхности модели элементов экранов с двухслойным композиционным покрытием (вязкий металлический слой NiAl и слой из твердой оксидной керамики Al2O3) компрессионным плазменным потоком. В качестве рабочего газа использовали азот. Композиционное покрытие из твердой оксидной керамики Al2O3 представляет собой пористую структуру, состоящую из сплавленных частиц Al2O3 размером 10–15 мкм. В пространстве между частицами наблюдались металлические вкрапления, образовавшиеся в результате эрозии электродов плазмотрона. После обработки поверхности двухслойных композиционных покрытий компрессионным плазменным потоком на ней в результате нестационарных процессов плавления и перекристаллизации образовался высокопрочный поликристаллический слой. При этом те области поликристаллического слоя, где были металлические вкрапления, оказались окрашенными в различные цвета в зависимости от химического состава вкрапления.

Keywords

плазменное покрытие, оксид алюминия, импульсная плазма, оптимизация процесса, структура покрытия, фазовый состав, баллистическая стойкость

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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
gold