Improvement of energy efficiency in the operation of a thermal reactor with submerged combustion apparatus through the cyclic input of energy

Belozerov, Valery; Mahatilova, Anna; Sоbоl, O. V.; Subbotinа, Valeria; Subbotin, A. V.

doi:10.15587/1729-4061.2017.96721

Cited by 11 publications

(9 citation statements)

References 20 publications

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“…The process was carried out in an alkaline-silicate electrolyte of various compositions in a condenser-type plant [1] in the anode-cathode regime. The current density was 5-50 A/dm 2 .…”

Section: Materials and Methods For Obtaining And Studying The Coatingmentioning

confidence: 99%

“…Methods of modifying the surface are divided into two groups -modifications with and without an increase of thickness [1]. This helps achieve the most effective use of a combination of properties of the base material and of the modified surface layer.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, there are various options for thermal processing [3], chemical-thermal treatment [4], electrochemical technology [1], coatings with electron beam [5], magnetron [6], vacuum arc [7] and other methods. These types of effect produced on materials have technological and instrumental differences, but at the same time they have much in common, which is determined by the final structural state of the material.…”

Section: Introductionmentioning

confidence: 99%

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The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition

Belozerov

Sоbоl

Mahatilova

et al. 2017

EEJET

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“…The process was carried out in an alkaline-silicate electrolyte of various compositions in a condenser-type plant [1] in the anode-cathode regime. The current density was 5-50 A/dm 2 .…”

Section: Materials and Methods For Obtaining And Studying The Coatingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition

Belozerov

Sоbоl

Mahatilova

et al. 2017

EEJET

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“…Coatings are the basis of most modern technologies in mechanical engineering, aircraft construction and medical technology [1,2]. The most promising directions in the field of creating multifunctional coatings are multi-element [3,4], multilayer [5,6] and hybrid (formed from a base material with a partial thickness increment [7,8]) coatings. In recent years, the method of structural engineering of coatings has been effectively used to form coatings with desired properties [9,10].…”

Section: Introductionmentioning

confidence: 99%

A study of the phase-structural engineering possibilities of coatings on D16 alloy during micro-arc oxidation in electrolytes of different types

Subbotinа

Sоbоl

Belozerov

et al. 2020

EEJET

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The effect of electrolysis conditions with different electrolyte compositions on the growth kinetics, phase-structural state, and hardness of coatings obtained by microarc oxidation (MAO) on the D16 aluminum alloy (base-aluminum, main impurity Cu) was studied. An analysis of the results obtained showed that the choice of the type of electrolyte and the conditions for the MAO process makes it possible to vary the growth kinetics and phase-structural state of the coating on the D16 aluminum alloy within a wide range. For all types of electrolytes, with an increase in the content of KOH, Na 2 SiO 3 , or KOH+Na 2 SiO 3 , the growth rate of MAO coatings increases. It was found that in MAO coatings obtained in an alkaline (KOH) electrolyte, a two-phase (γ−Al 2 O 3 and α−Al 2 O 3 phases) crystalline state is formed. An increase in the KOH concentration leads to an increase in the relative content of the α-Al 2 O 3 phase (corundum). During the formation in a silicate electrolyte, the phase composition of MAO coatings with an increase in the content of liquid glass (Na 2 SiO 3) changes from a mixture of the γ−Al 2 O 3 phase and mullite (3Al 2 O 3 •2SiO 2) to an X-ray amorphous phase. The use of a complex electrolyte leads to a two-phase state of the coating with a large (compared to an alkaline electrolyte) shift of the γ−Al 2 O 3 →α−Al 2 O 3 transformation towards the formation of the α−Al 2 O 3 phase. It was determined that the value of hardness correlates with the content of the α−Al 2 O 3 phase in the MAO coating, reaching the maximum value of 1620 kg/mm 2 at the highest content (about 80 vol. %) of the α−Al 2 O 3 phase. Two types of dependences of the coating thickness on the amount of electricity passed were revealed. For the amount of passed electricity 10-50 A-h/dm 2 , the thickness dependence is determined as 4.2 µm/(A-h/dm 2), which suggests the basic mechanism of electrochemical oxidation during the formation of a coating. For the amount of electricity transmitted 50-120 A-hour/ dm 2 , the thickness dependence is determined by a much smaller value of 1.1 µm/(A-hour/dm 2). This suggests a transition to a different mechanism of coating formation − the formation of a coating with the participation of electrolysis components

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“…These microdischarges have a thermal and plasmochemical effect on the coating itself and electrolyte [28,29]. As a result, the hardness and strength of materials increase [30,31].…”

Section: Introductionmentioning

confidence: 99%

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

Subbotinа¹,

Al-Qawabeha²,

Belozerov³

et al. 2019

EEJET

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Методом мікродугового оксидування технічно чистого алюмінію і алюмінію легованого міддю і цинком в лужно-силикатном електроліті при щільності струму ~20 А/дм 2 одержані покриття товщиною близько 100 мкм. Наведено результати дослідження морфології поверхні, фазового складу і твердості МДО-покриттів. Параметрами зміни служили склад електроліту і концентрація легуючих (Cu і Zn) елементів. Це дослідження проведено тому, що наявних в даний час даних не достатньо для уявлення про характер впливу хімічного складу алюмінієвого сплаву і умов електролізу (зокрема, складу електроліту) на механізм і кінетику перетворення γ→a. А без розуміння цього спрямована зміна структурного стану і властивостей МДО покриттів стає неможливою. В результаті досліджень було встановлено, що при мікродуговом оксидуванні алюмінієвих сплавів в лужному електроліті з додаванням рідкого скла (Na 2 SiO 3) різної концентрації зміцнений шар складається з оксидів a-А1 2 О 3 , γ-А1 2 О 3 і муллита 3Al 2 O 3 • 2SiO 2. Дані рентгеноструктурного аналізу покриттів свідчать про кристалічну будову покриттів. Встановлено, що легування алюмінію міддю і цинком істотно впливає на фазовий склад покриття, змінюючи кількісне співвідношення фаз нелінійним чином. Найбільший вміст a-А1 2 О 3 фази (до 60 об. %) досягається при легуванні Cu. При цьому найбільш висока твердість МДО покриттів досягається при використанні електроліту складу 1 г/л KOH і 6 г/л Na 2 SiO 3 в алюмінієвих сплавах при вмісті міді більше 3 %, а цинку-2-3 %. Встановлено, що механізм формування фазового складу слід пов'язати зі стабілізацією і дестабілізацією фази γ-А1 2 О 3. З цього для досягнення високої твердості слід вибирати ті легуючі елементи, які впливають на дестабілізацію γ-А1 2 О 3 , що забезпечує утворення фази a-А1 2 О 3 (корунд). У зв'язку з цим виявлено, що катіони Cu 2+ сприяють дестабілізації фази γ-А1 2 О 3 , а катіони Zn 2+ призводять до стабілізації фази γ-А1 2 О 3 при утриманні Zn>3 % Ключові слова: мікродугове оксидування, анодно-катодний режим, склад електроліту, легування, фазовий склад, корунд

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Improvement of energy efficiency in the operation of a thermal reactor with submerged combustion apparatus through the cyclic input of energy

Cited by 11 publications

References 20 publications

The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition

The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition

A study of the phase-structural engineering possibilities of coatings on D16 alloy during micro-arc oxidation in electrolytes of different types

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

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Improvement of energy efficiency in the operation of a thermal reactor with submerged combustion apparatus through the cyclic input of energy

Cited by 11 publications

References 20 publications

The influence of the conditions of microplasma processing (microarc oxidation in anode­cathode regime) of aluminum alloys on their phase composition

The influence of the conditions of microplasma processing (microarc oxidation in anode­cathode regime) of aluminum alloys on their phase composition

A study of the phase-structural engineering possibilities of coatings on D16 alloy during micro-arc oxidation in electrolytes of different types

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

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The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition

The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition