Thermodiffusion Saturation of the Surface of VT22 Titanium Alloy from a Controlled Oxygen–Nitrogen-Containing Atmosphere in the Stage of Aging

Fedirko, V. М.; Pohrelyuk, І. М.; Luk’yanenko, A. G.; Lavrys, S. М.; Киндрачук, М. В.; Духота, Олександр Іванович; Тіsov, Oleksandr; Zahrebelnyi, V. V.

doi:10.1007/s11003-018-0125-z

Cited by 14 publications

(13 citation statements)

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“…Oxidation of the D16 alloy at different current densities (12-23 A/dm 2 ) showed that the thickness of the coating is determined by the amount of electricity passed, defined in A-hour/dm 2 (Fig. 12).…”

Section: Phase Composition and Properties Of Mao Coatings During Omentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Phase Composition and Properties Of Mao Coatings During Omentioning

confidence: 99%

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 routinely applied surface modification methods include but are not limited to physical vapor deposition, chemical vapor deposition, thermochemical treatment, etc. [19][20][21][22]. Among applied coatings, titanium nitride (TiN) and diamond-like-carbon (DLC) are routinely used to improve tribological performance of metallic materials.…”

Section: Introductionmentioning

confidence: 99%

The Effect of TiN and DLC Anti-Wear Coatings on the Tribofilm Formation and Frictional Heat Phenomena in Coated Metals vs. WC-Co

et al. 2021

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The aim of this work was to study the effect of anti-wear coatings on the selected frictional phenomena, i.a., frictional heating and tribofilm formation, of model tribological pairs. For this purpose, three popular metallic substrate materials were selected: AISI 316L and AISI 440B stainless steels, as well as Ti6Al4V two-phase titanium alloy. The substrates were tested in the dry sliding conditions in three states: uncoated, as well as titanium nitride (TiN) or diamond-like-carbon (DLC) coated. According to the results provided, under applied frictional conditions TiN coating, even if it is worn off the sample surface, contributes to excessive frictional heating of a tribological pair by altering the tribofilm formation. The analysis also showed that in some tribological pairs, rapid temperature alteration of a counter sample can be used to approximate the sliding distance after which the TiN coating becomes worn off. On the contrary, in all pairs tested, the DLC film became locally damaged, but it sustained its antifriction properties, contributing to low coefficients of friction (COFs) and the lowest frictional temperatures observed.

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“…Applying coatings to the surface of materials, as well as adjusting their composition [1,2] and structure [3,4] allows the most rational and cost-effective use of the properties of oxide through the transport of oxygen ions (O 2-) to the oxide/electrolyte interface and the transfer of Al 3+ to the metal/oxide interface in the opposite direction [33,34].…”

Section: Introductionmentioning

confidence: 99%

A study of the electrolyte composition influence on the structure and properties of MAO coatings formed on AMg6 alloy

Subbotinа¹,

Sоbоl²,

Belozerov³

et al. 2020

EEJET

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Досліджено вплив умов електролізу при різних складах електроліту на фазоутворення і властивості покриттів, отриманих мікродуговим оксидуванням (МДО) на алюмінієвому сплаві АМг6. Для електролізу використовувалися електроліти трьох типів: лужний електроліт (розчин (КОН) в дистильованої воді), силікатний електроліт (з різним процентним вмістом Na 2 SiO 3 складової) і комплексний лужно-силікатний електроліт з вмістом рідкого скла (1÷12 г/л Na 2 SiO 3) і гідроксиду калію (1÷6 г/л КОН). Аналіз отриманих результатів показав, що вибір типу електроліту і умов протікання процесу мікродугового оксидування дозволяє в широких межах змінювати фазово-структурний стан, товщину і властивості алюмінієвого сплаву АМг6. Критерієм очікуваного в результаті мікродугового оксидування фазово-структурного стану покриттів є повнота протікання процесу γ-Al 2 O 3 →α-Al 2 O 3 перетворення при формуванні покриттів. Використання лужного електроліту не дозволяє досягти високої твердості покриття через формування γ-Al 2 O 3 фази і відсутності термодинамічних умови для переходу γ-Al 2 O 3 →α-Al 2 O 3. При використанні силікатної електроліту вдається значно підвищити швидкість росту покриття, але при цьому наявність великої питомої концентрації Si стимулює утворення муллиту і аморфноподібної фази. Використання комбінованого лужно-силікатного електроліту (з різним процентним вмістом КОН+Na 2 SiO 3) при малому вмісті (6 г/л) Na 2 SiO 3 в розчині, стимулює утворення муллиту. Це проявляється в найбільшій мірі при найменшому вмісту (1 г/л) КОН складової. При більшому вмісті (2 г/л) КОН складової, стають домінуючими процеси, які характерні для лужного електроліту. Це призводить до незавршенності реакції перетворення і утворення тільки γ-Al 2 O 3 фази. Досягнення термодинамічних умов γ-Al 2 O 3 →α-Al 2 O 3 перетворення стало можливим при збільшенні до 12 г/л питомої вмісту Na 2 SiO 3 в розчині електроліту. В цьому випадку формувалися МДО-покриття на сплаві АМг6 з найбільшою твердістю 1500 кг/мм 2 і високою електричною міцністю 12 В/мкм Ключові слова: мікродугове оксидування, лужний електроліт, силікатний електроліт, комплексний електроліт, фазовий склад, електрична міцність

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Thermodiffusion Saturation of the Surface of VT22 Titanium Alloy from a Controlled Oxygen–Nitrogen-Containing Atmosphere in the Stage of Aging

Cited by 14 publications

References 1 publication

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

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

The Effect of TiN and DLC Anti-Wear Coatings on the Tribofilm Formation and Frictional Heat Phenomena in Coated Metals vs. WC-Co

A study of the electrolyte composition influence on the structure and properties of MAO coatings formed on AMg6 alloy

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