Військовий інститут танкових військ НТУ "ХПІ"

Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/21691

Начальник інституту
Серпухов Олександр Васильович
Склад інституту
1. Факультет озброєння і військової техніки;
2. Факультет радіаційного, хімічного, біологічного захисту та екологічної безпеки;
3. Кафедра фізичного виховання спеціальної фізичної підготовки і спорту;
4. Кафедра військової підготовки офіцерів запасу;
5. Батальйон забезпечення навчального процесу.

Переглянути

Фільтри

20172

Налаштування

Ключові слова: search.filters.subject.mixed oxide system

Результати пошуку

Зараз показуємо 1 - 2 з 2
  • Ескіз
    Документ
    Synthesis of catalytic cobalt-containing coatings on alloy AL25 surface by plasma electrolytic oxidation
    (Інститут хімії поверхні ім. О. О. Чуйка НАН України, 2017) Ved, M. V.; Karakurkchi, A. V.; Sakhnenko, N. D.; Gorohivskiy, A. S.
    The study aims at the investigation of the influence of electrolyte composition and plasma electrolytic oxidation modes on the composition and morphology of a mixed aluminum and cobalt oxides at the AL25 alloy. Composition, morphology and surface roughness of the oxide systems are examined by scanning electron microscopy, X-ray analysis and atomicforce microscopy. Mixed oxide coatings Al₂O₃·CoOₓ formed from the diphosphate electrolytes at various concentration ratio diphosphate/cobalt sulfate contain cobalt of 8-30 at. % (in terms of metal) in the matrix of alumina. Plasma electrolytic oxidation in a two-stage mode of the incident power provided formation of strongly adhered coatings characterized by non-stoichiometry ratio of cobalt and oxygen as well aslow content of silicon in deposits. Obtained mixed oxide systems have developed surface with alternating the spheroid and torus-shaped structures which is associated with a large number of catalytic sites. They exhibit catalyticbehavior in the model reactions of CO conversion to CO₂ and benzene oxidation not inferior to the contacts with noble metals. The coatings Al₂O₃·CoOₓ contribute to fuel economy and improve the environmental performance of the internal combustion engine thus can be recommended for use in the neutralization of gas emissions systems and as coatings for pistons of combustion chamber.
  • Ескіз
    Документ
    Mixed alumina and cobalt containing plasma electrolytic oxide coatings
    (IOP Publishing Ltd, 2017) Yar-Mukhamedova, G. Sh.; Ved, M. V.; Karakurkchi, A. V.; Sakhnenko, N. D.
    Principles of plasma electrolytic oxidation of the AL25 aluminum alloy in diphosphate alkali solutions containing cobalt(2+) cations are discussed. It has been established that a variation in the concentration of the electrolyte components provides the formation of mixed-oxide coatings consisting of the basic matrix materials and the cobalt oxides of different content. An increase in the cobalt oxide content in the coating is achieved by the variation in electrolysis current density as well as the treatment time due to both the electrochemical and thermo-chemical reactions at substrate surface and in spark region. Current density intervals that provide micro-globular surface formation and uniform cobalt distribution in the coating are determined. The composition and morphology of the surface causes high catalytic properties of synthesized materials, which confirmed the results of testing in model reaction CO and benzene oxidation as well as fuel combustion for various modes of engine operation.