Готові списки джерел за темами / Gradient coatings

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Добірка наукової літератури з теми "Gradient coatings"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Gradient coatings"

1

Szparaga, Łukasz, Przemysław Bartosik, Adam Gilewicz, Katarzyna Mydłowska, and Jerzy Ratajski. "Optimisation of Mechanical Properties of Gradient Zr–C Coatings." Materials 14, no. 2 (2021): 296. http://dx.doi.org/10.3390/ma14020296.

Повний текст джерела
Анотація:
One of the key components of the designing procedure of a structure of hard anti-wear coatings deposited via Physical Vapour Deposition (PVD) is the analysis of the stress and strain distributions in the substrate/coating systems, initiated during the deposition process and by external mechanical loads. Knowledge of residual stress development is crucial due to their significant influence on the mechanical and tribological properties of such layer systems. The main goal of the work is to find the optimal functionally graded material (FGM) coating’s structure, composed of three functional layers: (1) adhesive layer, providing high adhesion of the coating to the substrate, (2) gradient load support and crack deflection layer, improving hardness and enhancing fracture toughness, (3) wear-resistant top layer, reducing wear. In the optimisation procedure of the coating’s structure, seven decision criteria basing on the state of residual stresses and strains in the substrate/coating system were proposed. Using finite element simulations and postulated criteria, the thickness and composition gradients of the transition layer in FGM coating were determined. In order to verify the proposed optimisation procedure, Zr-C coatings with different spatial distribution of carbon concentration were produced by the Reactive Magnetron Sputtering PVD (RMS PVD) method and their anti-wear properties were assessed by scratch test and ball-on-disc tribological test.
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2

Szparaga, Łukasz, Przemysław Bartosik, Adam Gilewicz, Katarzyna Mydłowska, and Jerzy Ratajski. "Optimisation of Mechanical Properties of Gradient Zr–C Coatings." Materials 14, no. 2 (2021): 296. http://dx.doi.org/10.3390/ma14020296.

Повний текст джерела
Анотація:
One of the key components of the designing procedure of a structure of hard anti-wear coatings deposited via Physical Vapour Deposition (PVD) is the analysis of the stress and strain distributions in the substrate/coating systems, initiated during the deposition process and by external mechanical loads. Knowledge of residual stress development is crucial due to their significant influence on the mechanical and tribological properties of such layer systems. The main goal of the work is to find the optimal functionally graded material (FGM) coating’s structure, composed of three functional layers: (1) adhesive layer, providing high adhesion of the coating to the substrate, (2) gradient load support and crack deflection layer, improving hardness and enhancing fracture toughness, (3) wear-resistant top layer, reducing wear. In the optimisation procedure of the coating’s structure, seven decision criteria basing on the state of residual stresses and strains in the substrate/coating system were proposed. Using finite element simulations and postulated criteria, the thickness and composition gradients of the transition layer in FGM coating were determined. In order to verify the proposed optimisation procedure, Zr-C coatings with different spatial distribution of carbon concentration were produced by the Reactive Magnetron Sputtering PVD (RMS PVD) method and their anti-wear properties were assessed by scratch test and ball-on-disc tribological test.
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3

WANG, TAO, NING WANG, YANG LI, HAO WANG, JIE TANG, and YUNSHAN WANG. "STUDY ON PREPARATION TECHNOLOGIES OF THERMAL BARRIER COATINGS." Surface Review and Letters 24, no. 04 (2016): 1730004. http://dx.doi.org/10.1142/s0218625x17300040.

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Анотація:
Thermal barrier coatings (TBCs) is one of the main key technology for the high-pressure turbine blades which are the main components of the high-performance aerospace engines. It offers protection for underline metallic components from corrosion, oxidation and localized melting by insulating the metal from hot gases in the engine core. The properties and lifetime of TBCs are greatly influenced by the preparation technology, which includes plasma spraying (PS), physical vapor deposition (PVD) and laser re-melting (LM). In this paper, three technologies used to prepare the TBCs are reviewed. Resulting features of coating fabricated by each technology are also discussed such as: the porosity, the thermally grown oxide (TGO), the erosion resistance, the thermal shock and so on. Especially, it is pointed out that the performances of gradient coating and nano-coating are better than the traditional coatings. In addition, it is widely accepted that laser can be applied to re-melt the PS coating and even directly clad the gradient coating. In the future, the traditional preparation technology should be improved continually in order to enhance the coating lifetime, enhance the properties of coating and lower the cost of process. Moreover, the researches on gradient-nano-structured coatings preparation are absent and should be done with emphasis since the nano-structure and gradient structure can both benefit the lifetime and properties of coatings.
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4

Su, Ya Yu, Xiao Lei Li, Hui Jie Tang, Zhi Hao Zhao, and Jian He. "Thermal Shock Behavior and Bonding Strength of MoSi2-BaO-Al2O3-SiO2 Gradient Porous Coating with Polymethyl Methacrylate Addition for Porous Fibrous Insulations." Solid State Phenomena 281 (August 2018): 493–98. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.493.

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Анотація:
In order to improve the thermal shock behavior of high temperature resistant coating on porous fibrous referactory insulations, the MoSi2-BaO-Al2O3-SiO2(MoSi2-BAS) gradient porous coatings were designed by preparing a dense surface layer and a porous bonding layer with the method of brushing and subsequent sintering at 1773 K. The porous bonding layer was obtained by adding polymethyl methacrylate (PMMA) as pore former. As the content of PMMA increases, the MoSi2-BAS coatings changed from a dense structure into a gradient porous structure. The interface bonding strength and thermal shock resistance of the MoSi2-BAS coatings were investigated. The result shows that the as-prepared coating with gradient porous structure exhibited excellent thermal shock resistance, which remained gradient structure without cracking after thermal cycling 100 times between 1773 K and room temperature. And the interface bonding strength of the gradient porous coating reached 1.5±0.08 Mpa, which was much better than that of the dense coating.
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5

Li, Chenchen, Xuefeng Yang, Shouren Wang, Yanjun Wang, and Jinlong Cao. "Preparation of WC Reinforced Co-Based Alloy Gradient Coatings on a H13 Mold Steel Substrate by Laser Cladding." Coatings 10, no. 2 (2020): 176. http://dx.doi.org/10.3390/coatings10020176.

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Анотація:
H13 die steel often fails as a result of physical and chemical effects such as wear, erosion and cyclic stress. Accordingly, the study evaluates Co-based gradient coating on an H13 steel featuring a stress-relieving effect. Scanning electron microscope and X-ray diffraction were used to analyze the microstructure and phase of the coatings. A microhardness tester and friction and wear tester were used to compare the hardness and wear resistance of the coatings and the substrate, and the wear morphology was observed. A pendulum impact test was used to compare the impact resistance of the coatings and the substrate, and the fracture morphology was observed. Finally, a corrosion test was used to compare the corrosion resistance of coatings and substrate. The results show that the Co-based gradient coatings have good combinations with the substrate, the hard phase content gradually increases from the bottom to the top of the coating, and the crystal microstructure generally maintains a distribution trend from coarse to fine. The hardness of the gradient coatings is significantly higher than the substrate, and from the coating surface to the substrate, the hardness decreases slowly. The wear loss of the coatings is much lower than that of the substrate, the main wear mechanism of the substrate is abrasive wear, and the main wear mechanism of the coatings is brittle spalling. While the gradient coatings increase the surface hardness, the brittleness also increases, the impact resistance of the coatings is lower than that of the substrate, the fracture form of the substrate is a ductile fracture, and the fracture form of the coating is a brittle fracture. The gradient coatings effectively improve the corrosion resistance of the substrate surface, and the higher the content of the reinforcing phase, the better the corrosion resistance of the coatings.
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6

Szparaga, Łukasz, Przemysław Bartosik, Adam Gilewicz, and Jerzy Ratajski. "Optimization of CrN/CrCN Gradient Coatings." Solid State Phenomena 237 (August 2015): 41–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.237.41.

Повний текст джерела
Анотація:
The paper describes the optimization procedure supporting the designing process of geometry of gradient coatings basing on numerical simulation of internal stress and strain distributions in the coating and substrate. In mathematical model the gradient coating is represented by the so-called transition functions describing the change of physico-chemical parameters such as Young's modulus, Poisson's ratio, thermal expansion coefficient and the density as a function of the spatial variables. The object of optimization is system composed of a CrN/CrCN gradient coating and Cr interlayer between the CrN /CrCN coating and the steel substrate deposited on nitrided 4140 steel substrate. Decision variables are: the parameters of the of curvature of transition function , thickness of gradient coating and the thickness of the Cr interlayer. Optimization was carried out under pre-defined fixed continuous external loads and created decision criteria were the functions of the state of stress and strain in the coating and the substrate. Using the optimization procedure the sets of optimal parameters (Pareto sets) of the PVD gradient coating/nitrided substrate systems, due to the adopted decision criteria were determined. The analysis of the obtained optimal solutions (Pareto-optimal sets) was carried out using the "utopian solution method". It was also examined the technological stability of the Pareto-optimal solutions (nondominated) by analyzing the number of direct neighbors of these solutions in the decision variables space.
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7

He, Dai Hua, Qian Zhao, Chang Bao Wang, et al. "Sol-Gel Derived Gradient Biocoatings on Titanium Alloy." Applied Mechanics and Materials 80-81 (July 2011): 426–30. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.426.

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Анотація:
The bioceramic hydroxyapaptie (HA) is frequently used as coat in titanium medical implants improving bone fixation and thus increasing a lifetime of the implant. However, its joining to the titanium alloy is not satisfactorily good. The aim of this work is to produce TiO2and HA gradient coatings on Ti6Al4V alloy to improve the interface joining. Compared the microstructures of cross section of Ti6Al4V-HA coating and Ti6Al4V-TiO2/HA gradient coatings. HA coatings were obtained by sol-gel method with sol solutions prepared from calcium nitrate tetrahydrate and triethyl phosphate as the calcium and phosphorous sources. And TiO2 coatings were obtained from Tetra Butyl Titanate and absolute ethyl alcohol as the sources by sol-gel method too. The configuration and structure were investigated with scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The results demonstrated that the TiO2/HA gradient coatings have a homogeneous microstructure. The TiO2coating made the HA coating adhere to the Ti-6Al-4V substrate well.
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8

Ning, Cheng Yun, Ying Jun Wang, Xiao Feng Chen, Jian Dong Ye, Gang Wu, and Na Ru Zhao. "TEM Analysis on Bio-Functional Gradient Hydroxyapatite/ZrO2 Coatings." Key Engineering Materials 336-338 (April 2007): 1676–78. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1676.

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Анотація:
In the present study, bioactive functional gradient coatings were prepared using net-energy controlled plasma spraying technology. The microstructure and phases of the bioactive functional gradient coating were examined by means of transmission electron microscope, scanning electron microscopy and X-ray diffraction. The results revealed that: (1) as-sprayed coatings contained a large amount of amorphous phases and some nano-sized HA crystals formed during rapid solidification, (2) surface of the coating was very rough with different-sized micropores, and the gradient layer was much denser which firmly bonded to the substrate without gaps and obvious interface between the coating and the substrate
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9

Kolaklieva, Lilyana, Roumen Kakanakov, D. Chaliampalias, et al. "Mechanical, Structural and Thermal Properties of Multilayered Gradient Nanocomposite Coatings." Journal of Nano Research 17 (February 2012): 193–202. http://dx.doi.org/10.4028/www.scientific.net/jnanor.17.193.

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Анотація:
Multilayered, Gradient Tialsin-Based Nanocomposite Coatings Have Been Developed and Investigated with Respect to their Applicability in the Machining Industry. the Main Coating Layer Was Composed of 5-8 Nm Tin and Aln Nanograins. the Coating Possessed Hardness as High as 40 GPA, which Allows it to Be Classified as Superhard. during Heating up to 900oC in Air in Steps of 100oC for 6 H at each Temperature, the Coating Showed Good Stability up to 700oC. Thermal Treatment over this Temperature Caused a Decrease in the Hardness to Values Characteristic for Tialn Multilayered Coatings, while the Adhesion to the Substrate Remained Steady.
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10

Ratajski, Jerzy, Adam Gilewicz, Katarzyna Mydłowska, and Łukasz Szparaga. "Inter-Relationship between Coating Micro/Nanostructure and the Tribological Performance of Zr–C Gradient Coatings." Coatings 10, no. 11 (2020): 1121. http://dx.doi.org/10.3390/coatings10111121.

Повний текст джерела
Анотація:
The research presented in this article concerns Zr–C gradient coatings that were deposited on HS6-5-2 steel by reactive magnetron sputtering from the Zr target in appropriately programmed C2H2 mass flow rate, resulting in various profiles of atomic carbon concentrations in the coating and consequently in spatial change of the properties (H, E, …) and behavior (H/E, H3/E2, We). In particular, the characteristic changes in hardness and Young’s modulus in the Zr–C coatings represented approximately by the bell curve, which has a maximum at the content of about 50 at.% C, were an inspiration to study the behavior of gradient coatings with carbon content in the range of 0–50 and 50–85 at.% with the same hardness change profile. The obtained results indicate that, firstly, the gradient of spatial changes in the coating composition increases their resistance to cohesive damage in comparison to non-gradient coatings, and, secondly, the results show that high hardness is a desired property but not sufficient to ensure adequate coating performance. Independently, an appropriate nano/microstructural structure is necessary, which determines their tribological behavior. In particular, in the case of the tested Zr–C coatings, the obtained results indicate that gradient coatings with a carbon content in the range of 50–85 at.% have better properties, characterized by the critical force Lc2, wear, coefficient of friction, H/E and H3/E2 ratios.
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Більше джерел

Дисертації з теми "Gradient coatings"

1

Heidari, Maryam. "3D modelling of functionally graded coatings." Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=215382.

Повний текст джерела
Анотація:
The purpose of this study is to investigate the behaviour of functionally graded materials in the coating design through analytical and numerical work. Functionally graded materials are advanced composite materials formed from two or more constituents with a continuously varying composition, which results in a continuous variation of material properties from one surface of the material to the other. The concept of functionally graded material is actively explored in coating design where structural and/or functional failures of the coating can happen due to a mismatch between the material properties of the coating and substrate, particularly at the coating/substrate interface. This work focuses on the performance of coated plates with homogeneous and graded coatings under various types of loading to develop a better understanding of their response. Firstly, the three dimensional elasticity solution for an isotropic coated plate with a stiffness gradient in the coating is extended to cover different types of applied loading and then a three dimensional elasticity solution for transversely isotropic materials with gradients in elastic properties is also developed. Based on the extended/developed solutions, a MATLAB code is created to produce a model that would enable the analysis of coated plates for a range of material, geometric and loading parameters. To test the analytical models, a finite element analysis is performed using the commercial finite element software ABAQUS, in which a user material subroutine is employed to generate a gradient in the material properties within each element and increase the accuracy of the results. All the developed analytical and numerical models are then used to carry out a comparative study of three-dimensional stress and displacement fields in the coated plates with homogeneous and graded coatings and establish the effect of various parameters such as coating thickness, coating position, plate dimensions, stiffness gradient, loading distributions and anisotropy on the coated plate response.
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2

Vaidyaraman, Sundararaman. "Carbon/carbon composites by forced flow-thermal gradient chemical vapor infiltration (FCVI) process." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/10028.

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3

Bell, Bryan Frederick. "Functionally graded, multilayer diamondlike carbon-hydroxyapatite nanocomposite coatings for orthopedic implants." Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-06072004-131058/unrestricted/bell%5Fbryan%5Ff%5F200405%5Fms.pdf.

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4

Bell, Bryan Frederick Jr. "Functionally graded, multilayer diamondlike carbon-hydroxyapatite nanocomposite coatings for orthopedic implants." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7962.

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5

Dong, Shuhong. "Effects of Thermal Gradient and Cyclic Oxidation on the Delamination and Lifetime of High Temperature Protective Coatings." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38334.

Повний текст джерела
Анотація:
Thermal barrier coatings have been widely used to provide thermal protection to components in the hot section of gas turbines. This research focuses on two influencing factors on coating behavior: thermal gradient and cyclic oxidation. The delamination mechanics under thermal gradient is analyzed, taking thermally grown oxide into consideration. Coatings experience thermal gradients at different stages during actual service flight. One is due to engine power shut down when landing and the other due to internal cooling of the substrate. Thermally grown oxide (TGO) also acts as a critical factor in delamination mechanics. The induced stress gradient and corresponding energy release rate for interface delamination and shallower delamination are presented. Mechanism maps that explain the criteria for preventing delamination from developing and propagating are established. Three cooling trajectories are envisaged to analyze the variation in the possibility of delamination. Multilayer coatings used in components of the hot section of aero turbine engines also experience cyclic temperature variation during flight cycles. As experiment conditions vary and coating performance is improved, the time required to run through the test of coating failure can be both time-consuming and prohibitive. Therefore, protocols providing prediction of quantified coating behavior are in demand to shorten life-time tests. Curves of mass change are obtained from quantifying scale growth and loss by different models such as Cyclic Oxidation Spall Program (COSP). A modification is made by combining COSP and a mechanic based model to obtain critical parameters for lifetime prediction from short time experiment. The time for coatings to reach peak temperature during cycling is discovered to influence prominently on modeling results. Predictions for several coating compositions and cycling conditions are consistent with the data from the existing experiments of the coating system.
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6

Корнієнко, Анатолій Олександрович. "Формування триботехнічних властивостей композиційних електролітичних покриттів на основі нікелю створенням градієнтних структур. Автореферат дисертації на здобуття наукового ступеня кандидата технічних наук". Thesis, Національний авіаційний університет, 2007. http://er.nau.edu.ua/handle/NAU/35678.

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Анотація:
Дисертацію присвячено розробленню градієнтних композиційних електролітичних покриттів зміцнених макро- та наночастинками з керованими триботехнічними властивостями. Проведено аналітичні дослідження напружено-деформованого стану одно- та багатошарових градієнтних КЕП, навантажених силами тертя. Експериментально встановлено оптимальні щодо зносостійкості будову та режими нанесення КЕП Ni-SiC. Визначено вплив кількості та розміру частинок наповнювача на триботехнічні властивості покриттів. Проведенням експериментальних досліджень впливу градієнта будови КЕП на триботехнічні властивості встановлено, що більш високою зносостійкістю характеризуються градієнтні КЕП з “прямим” градієнтом будови, що узгоджується з теоретичними розрахунками напружено-деформованого стану. Дослідженнями встановлено, що із введенням одночасно макро- та наночастинок в КЕП значно підвищується зносостійкість таких покриттів. Показано, що оплавленням покриттів Ni-SiC, які містять додатково бор, можна значно підвищити їх фізико-механічні властивості та зносостійкість. При цьому для оплавлення більш ефективним є застосування лазера, а створення дискретно-оплавлених покриттів дозволяє отримати значно вищі триботехнічні властивості порівняно з повністю оплавленими покриттями.<br>Thesis is aim at development of gradient composition electrolytic coatings hardened by macro- and nanoparticles with the guided tribotechnical properties. Analytical researches of the tensely deformed state of single- and multi-layered gradient CEC loaded with forces of friction are conducted. The opti-mum structure and parameters process of CEC Ni-SiC are experimentally established in relation to wear-proofness. Influencing of amount and size of particles of stuff on tribotechnical property of coatings is determined. Experimental researches of influencing of gradient of structure of CEC are conducted on tri-botechnical property. It is established that the higher wearproofness is characterize gradient CEC with the “direct” gradient of structure, that conforms to the theoretical calculations of the tensely deformed state. Researches is established, introduction simultaneously of macro- and nanoparticles into CEC raise wear-proof of such coatings. It is established, meltback of coatings Ni-SiC, which contain the boron additional-ly, it is possible considerably to raise their physical-mechanical properties and wearproofness. Thus for meltback more effective is application of laser, and the creation of discretely meltback coatings allows to get considerably higher tribotechnical properties comparatively with fully meltback coatings
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7

Гуменюк, Ігор Анатолійович. "Триботехнічні властивості сталі 12Х18Н10Т, поверхнево модифікованої комбінованими покриттями". Thesis, Національний авіаційний університет, 2018. http://er.nau.edu.ua/handle/NAU/36124.

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Анотація:
Гуменюк І.А. Триботехнічні властивості сталі 12Х18Н10Т, поверхнево модифікованої комбінованими покриттями. – На правах рукопису. Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю: 05.02.04 – тертя та зношування в машинах (13 – Механічна інженерія). Національний авіаційний університет, МОН України, Київ, 2018. Дисертаційна робота присвячена вирішенню актуального науково-технічного завдання підвищення зносостійкості поверхневих шарів корозійностійкої сталі 12Х18Н10Т шляхом формування зносостійких комбінованих дифузійних, електроіскрових та композиційних електролітичних покриттів дискретного і градієнтного типу та встановлення закономірностей впливу їх структурно-фазового складу, фізико-механічних властивостей і параметрів структури на триботехнічні характеристики. Дослідженні закономірності формування та механізми зношування багатокомпонентного хромоалітованого покриття в умовах тертя ковзання без змащення в залежності від хімічного і структурно-фазового складу. Представлено та описано результати експериментальних досліджень технологічного процесу азотування попередньо обробленої дискретно лазером сталі 12Х18Н10Т. Встановлено закономірності зношування від параметрів дискретної структури. Досліджено закономірності формування високотемпературним відпалом триботехнічних властивостей електроіскрових і композиційних електролітичних покриттів з евтектичним наповнювачем від ступеня нерівноважності структурно-фазових станів. Теоретично обґрунтовано та експериментально підтверджено вплив дифузійної перехідної зони між твердим наповнювачем і м’якою матрицею на напружено-деформований стан та зносостійкість композиційних електролітичних покриттів. На основі енергетичної моделі трибопроцесу виконано аналітичне дослідження умов утворення частинок зносу в процесі фрикційного руйнування приповерхневих шарів композиційного покриття. Застосовуючи енергетичний підхід до оцінювання зносостійкості поверхневих шарів за умов їх руйнування при терті розроблено технологічний процес формування на сталі 12Х18Н10Т градієнтного покриття з високою припрацьовуваністю і зносостійкістю. Проведено статистичний аналіз та побудовано регресійні моделі залежностей критеріїв оптимізації.<br>Gumenyuk I.A. Tribotechnical properties of steel 12C-18Cr-10Ni-Тi, surface-modified by combined coatings. – Manuscript. Thesis intended for getting scientific degree of Candidate of technical science by specialty: 05.02.04 – Friction and wear in machines (131 – Mechanical Engineering). National Aviation University, Ministry of Education and Science of Ukraine, Kyiv, 2018. The thesis is devoted to solving the actual scientific and technical task of increasing the wear resistance of surface layers of corrosion–resistant steel 12C-18Cr-10Ni-Тi by forming wear resistant combined diffusion, electrospray and composite electrolytic coatings of discrete and gradient type and establishing regularities of influence of their structural-phase composition, physical and mechanical properties and structural parameters on tribotechnical behavior. Investigation of regularities of formation and mechanisms of wear of multi-component chromoalluminized coating in conditions of dry sliding friction, depending on the chemical and structural-phase composition have been done. The results of experimental examinations of technological process of nitriding of selectively laser pre-treated steel 12C-18Cr-10Ni-Тi are presented and described. The regularities of wear on parameters of a discrete structure have been established. The regularities of formation of tribotechnical properties of electrospray and composite electrolytic coatings with eutectic filler by high-temperature annealing on the degree of nonequilibrim of structural-phase states were studied. The influence of the diffusion transition zone between the solid filler and the soft matrix on the stress-strain state and the wear resistance of composite electrolytic coatings was theoretically proved and experimentally confirmed. Based on the energy model of triboprocess, an analytical study of conditions for the formation of wear particles in the process of frictional destruction of near-surface layers of composite coating was carried out. Using the energy approach to evaluation of wear-resistance of surface layers in conditions of their fracture at friction, a technological process of forming gradient coating on the surface of 12C-18Cr-10Ni-Тi steel with high workability and wear resistance was developed. A statistical analysis was carried out. Regression models of dependencies of optimization criteria were constructed.
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Kim, Tae-Young. "Novel sol-gel titania-based hybrid organic-inorganic coatings for on-line capillary microextraction coupled to high-performance liquid chromatography." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001833.

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9

Shi, Jun. "On thermal mismatch and thermal gradients and the failure of thermal barrier coatings." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.35 Mb., 123 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3221078.

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10

Thomas, Gareth James. "Advanced materials for plasma facing components in fusion devices." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:f8ba1ae1-f303-4c32-877e-dca421a3cb5c.

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This thesis describes the design, manufacture and characterisation of thick vacuum plasma sprayed tungsten (W) coatings on steel substrates. Fusion is a potentially clean, sustainable, energy source in which nuclear energy is generated via the release of internal energy from nuclei. In order to fuse nuclei the Coulomb barrier must be breached - requiring extreme temperatures or pressures – akin to creating a ‘star in a box’. Tungsten is a promising candidate material for future fusion reactors due to a high sputtering threshold and melting temperature. However, the large coefficient of thermal expansion mismatch with reactor structural steels such as the low activation steel Eurofer’97 is a major manufacturing and in-service problem. A vacuum plasma spraying approach for the manufacture of tungsten and tungsten/steel graded coatings has been developed successfully. The use of graded coatings and highly textured 3D interface surfi-sculpt substrates has been investigated to allow the deposition of thick plasma sprayed tungsten coatings on steel substrates. Finite element models have been developed to understand the residual stresses that develop in W/steel systems and made use of experimental measurements of coating thermal history during manufacture and elastic moduli measured by nano-indentation. For both the graded and surfi-sculpt coating, the models have been used to understand the mechanism of residual stress redistribution and relief in comparison with simple W on steel coatings, particularly by consideration of stored strain energy. In the case of surfi-sculpt W coatings, the patterned substrate gave rise to regular stress concentrating features, and allowed 2mm thick W coatings to be produced reproducibly without delamination. Preliminary through thickness residual stress measurements were compared to model predictions and provided tentative evidence of significant W coating stress relief by regulated coating segmentation.
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Книги з теми "Gradient coatings"

1

SICMAC, Summer School on Layered Functional Gradient Ceramics and Thermal Barrier Coatings (2006 Mahón Spain). Layered, functional gradient ceramics, and thermal barrier coatings: Design, fabrication and applications : proceedings of the SICMAC summer school on layered, functional gradient ceramics, and thermal barrier coatings held in Maó, Menorca Island (Spain) on June 11-16, 2006. Trans Tech Publications Ltd., 2007.

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2

Zainuddin, I. Detection and sizing of coating defects on pipelines under cathodic protection by the D.C. voltage gradient method. UMIST, 1996.

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DellaCorte, Christopher. Evaluation of advanced solid lubricant coatings for foil air bearings operating at 25 and 500⁰C. National Aeronautics and Space Administration, Lewis Research Center, 1998.

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DellaCorte, Christopher. Evaluation of advanced solid lubricant coatings for foil air bearings operating at 25 and 500⁰C. National Aeronautics and Space Administration, Lewis Research Center, 1998.

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5

DellaCorte, Christopher. Evaluation of advanced solid lubricant coatings for foil air bearings operating at 25 and 500⁰C. National Aeronautics and Space Administration, Lewis Research Center, 1998.

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6

Friction and wear properties of a-DLC-based functionally gradient nanocomposite coatings. National Aeronautics and Space Administration, Lewis Research Center, 1998.

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7

(Editor), M. Angels Anglada, E. Jimenez-Pique (Editor), and P. Hvizdos (Editor), eds. Layered, Functional Gradient Ceramics, and Thermal Barrier Coatings: Design, Fabrication and Application (Key Engineering Materials). Trans Tech Pubn, 2007.

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8

N, Lee Kang, Miller Robert A. 1947-, and NASA Glenn Research Center, eds. Thermal conductivity and thermal gradient cyclic behavior of refractory silicate coatings on SiC/SiC ceramic matrix composites. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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9

A, Miller Robert, and Lewis Research Center, eds. Determination of creep behavior of thermal barrier coatings under laser imposed temperature and stress gradients. National Aeronautics and Space Administration, Lewis Research Center, 1997.

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10

Park, Sang Tae. Amorphous alumina oxidation protective coating for Zircaloy based on a compositional gradient layer system. 2004.

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Частини книг з теми "Gradient coatings"

1

Kunioshi, Clarice Terui, Olandir Vercino Correa, and Lalgudi Venkataraman Ramanathan. "Gradient Nickel – Alumina Composite Coatings." In Materials Science Forum. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-423-5.261.

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2

Minko, Sergiy, Leonid Ionov, Alexander Sydorenko, et al. "Gradient Stimuli-Responsive Polymer Grafted Layers." In Stimuli-Responsive Polymeric Films and Coatings. American Chemical Society, 2005. http://dx.doi.org/10.1021/bk-2005-0912.ch005.

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3

Knotek, O., J. Jungblut, and F. Löffler. "On Magnetron Sputtered Gradient and Multilayer Coatings." In Surface Engineering. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0773-7_53.

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4

Romashin, Sergey N., Victoria Yu Presnetsova, Larisa Yu Frolenkova, Vladimir S. Shorkin, and Svetlana I. Yakushina. "Theoretical Estimation of the Strength of Thin-film Coatings." In Higher Gradient Materials and Related Generalized Continua. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30406-5_11.

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5

Otooni, M. A., I. G. Brown, S. Anders, and Z. Wang. "Nanoscale/Multilayer Gradient Materials for Application in the Electromagnetic Gun Systems." In Protective Coatings and Thin Films. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5644-8_38.

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6

Kuznetsov, V. P., V. P. Lesnikov, N. A. Popov, I. P. Konakova, and M. A. Popova. "Gradient Complex Protective Coatings for Single-Crystal Nickel Alloys." In Advanced Methods and Technologies in Metallurgy in Russia. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66354-8_7.

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7

Rogachev, Alexandr V., Ekaterina A. Kulesh, Dmitry G. Piliptsou, Alexandr S. Rudenkov, and Jiang X. Hong. "Structure and Mechanical Properties of Gradient Metal-Carbon Coatings." In Recent Advances in Technology Research and Education. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99834-3_1.

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Vaßen, R., and D. Stöver. "Conventional and New Materials for Thermal Barrier Coatings." In Functional Gradient Materials and Surface Layers Prepared by Fine Particles Technology. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0702-3_21.

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9

Tan, Yang, Jon Longtin, Sanjay Sampath, and Dongming Zhu. "Effect of Thermal Gradient on the Through-Thickness Thermal Conductivity of Plasma-Sprayed TBCS." In Advanced Ceramic Coatings and Interfaces V. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470943960.ch6.

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10

Gogotsi, Yury, Valentin Kamyshenko, Vladimir Shevchenko, Sascha Welz, Daniel A. Ersoy, and Michael J. McNallan. "Nanostructured Carbon Coatings on Silicon Carbide: Experimental and Theoretical Study." In Functional Gradient Materials and Surface Layers Prepared by Fine Particles Technology. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0702-3_24.

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Тези доповідей конференцій з теми "Gradient coatings"

1

Adamson, Peep. "Gradient antireflection coatings with complex refractive index." In Optical Interference Coatings. OSA, 2004. http://dx.doi.org/10.1364/oic.2004.wa3.

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2

Jokinen, P. "HVOF-Sprayed Functionally Gradient Coating." In ITSC 1999, edited by E. Lugscheider and P. A. Kammer. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 1999. http://dx.doi.org/10.31399/asm.cp.itsc1999p0498.

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Abstract Thermally sprayed alumina coatings are widely used to improve wear resistance and heat insulation of steel and other metals. Usually these coatings have been made by plasma or flame spraying. HVOF-sprayed alumina coatings are more wear resistant and better bonded to the base material than with plasma and flame spraying. This paper presents a functionally gradient coating (FGC) of alumina and NiAl made with HVOF. It examines the microstructure, composition, hardness, adhesion, and resistance against thermal cycling of HVOF-sprayed FGC. The performance of FG-coating was proven with reference coatings made by plasma and flame spraying. Paper includes a German-language abstract.
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3

Weber, Joern, Hagen Bartzsch, and Peter Frach. "Sputter Deposition of Silicon Oxynitride Gradient and Multilayer Coatings." In Optical Interference Coatings. OSA, 2007. http://dx.doi.org/10.1364/oic.2007.ma5.

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4

Zhao, Shuxi, and Ewa Wäckelgård. "Gradient Coatings by Moving Substrate for Large Scale Production." In Optical Interference Coatings. OSA, 2010. http://dx.doi.org/10.1364/oic.2010.mc9.

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5

Janicki, V., J. Sancho-Parramon, and H. Zorc. "Gradient silver nanoparticle layers in absorbing coatings - experimental study." In Optical Interference Coatings. OSA, 2010. http://dx.doi.org/10.1364/oic.2010.wa11.

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6

Stenzel, Olaf, Steffen Wilbrandt, Robert Leitel, Dieter Gäbler, and Norbert Kaiser. "Non-optical and optical characterization of gradient index layers and rugate filters." In Optical Interference Coatings. OSA, 2004. http://dx.doi.org/10.1364/oic.2004.wb2.

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Guenster, Stefan, Manfred Dieckmann, Detlev Ristau, and David Le Bellac. "Spectrophotometric characterization of gradient index coatings." In Optical Systems Design and Production, edited by Claude Amra and H. Angus Macleod. SPIE, 1999. http://dx.doi.org/10.1117/12.360124.

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8

Andritschky, M., V. Teixeira, and D. Stöver. "Thermal Residual Stresses in Functionally Gradient Coatings." In ITSC 1997, edited by C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0847.

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Abstract The present contribution concerns with a numerical modelling of the residual stress distribution within a multilayered coating system which consists of a functionally gradient material (FGM). The structure of the graded system is made of a ceramic layer and a metallic layer, where between them there is an interlayer which is a graded composite made of the metal and ceramic. The composition changes gradually from 0% ceramic to 100% ceramic. This graded interlayer was modelled as a serie of perfectly bonded finite thin layers, each having slightly different material properties. We analyse the FGM design in respect to thermal stress optimization (e.g. reduction the interfacial stresses). The case of a bilayer, thick ceramic coating on a metallic substrate and a graded thermal barrier coating (TBC) is considered. The effects on thermal residual stress gradients of the compositional profiles and graded interlayer thickness were studied. This FGM stress model enable us to calculate the thermal strain and stress distributions, which gives a contribute to a better understanding of the failure of a graded coating system and is, therefore, a potential tool for FGM stress optimization to improve the thermo-mechanical stability of multilayer graded structures such as high temperature ceramic coatings for use in thermal barrier applications.
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Sharkany, Josif P., Mikhail J. Sichka, Anatolij M. Potapchuk, Ivan S. Lemko, and Josif L. Pintye. "Biocompatible gradient ceramic coatings for metal implants." In 6th Annual International Symposium on NDE for Health Monitoring and Diagnostics, edited by George Y. Baaklini, Eric S. Boltz, Steven M. Shepard, and Peter J. Shull. SPIE, 2001. http://dx.doi.org/10.1117/12.435570.

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10

Southwell, William H., Randolph L. Hall, and William J. Gunning III. "Using wavelets to design gradient-index interference coatings." In Optics Quebec, edited by Jerzy A. Dobrowolski and Pierre G. Verly. SPIE, 1993. http://dx.doi.org/10.1117/12.163558.

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