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Journal articles on the topic 'Two-layer coating Al2O3'

Author: Grafiati
Published: 28 May 2022
Last updated: 31 July 2025

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1

Huang, Kezhi, Hao Liu, Weijing Wang, et al. "Predicting the Residual Stress of Amorphous Al2O3-Y2O3 Nano-Laminated Deuterium Permeation Barrier under Thermal Cycles." Coatings 12, no. 11 (2022): 1780. http://dx.doi.org/10.3390/coatings12111780.

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Al2O3-Y2O3 laminated coating can be applied in fusion reactors to prevent fuel leakage and radiological hazard. However, the residual stress induced by the thermal cycles during the operation of the reactor can cause the failure of the coating. In order to analyze the problem, finite element models of Al2O3-Y2O3 laminated coatings with 600 nm of total thickness and different layout were analyzed. The max principal stress site in the coatings is located at the sub-top layer. The max principal stress in laminated coating with the Y2O3 sub-top decreases from 657 MPa for a two-layer coating (300 n
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2

Kuo, Tsung-Yuan, Chi-Sheng Chien, Cheng-Wei Liu, and Tzer-Min Lee. "Comparative investigation into effects of ZrO2 and Al2O3 addition in fluorapatite laser-clad composite coatings on Ti6Al4V alloy." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 233, no. 2 (2018): 157–69. http://dx.doi.org/10.1177/0954411918816113.

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Composite coatings consisting of fluorapatite mixed with 20 wt% yttria (3 mol%) stabilized cubic phase zirconia (c-ZrO2, 3Y-TZP) or 20 wt% alumina (α-Al2O3) were deposited on Ti6Al4V substrates using a Nd:YAG laser cladding system. The interface morphology, phase composition, micro-hardness and biological properties of the two coatings were examined and compared. The results showed that the fluorapatite/Al2O3 specimen underwent a greater inter-diffusion at the interface between the coating layer and the transition layer than the fluorapatite/ZrO2 specimen. During the cladding process, the ZrO2
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3

Aristia, Gabriela, Le Quynh Hoa, Marianne Nofz, Regine Sojref, and Ralph Bäßler. "Study of Al2O3 Sol-Gel Coatings on X20Cr13 in Artificial North German Basin Geothermal Water at 150 °C." Coatings 11, no. 5 (2021): 526. http://dx.doi.org/10.3390/coatings11050526.

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Al2O3 has been widely used as a coating in industrial applications due to its excellent chemical and thermal resistance. Considering high temperatures and aggressive mediums exist in geothermal systems, Al2O3 can be a potential coating candidate to protect steels in geothermal applications. In this study, γ-Al2O3 was used as a coating on martensitic steels by applying AlOOH sol followed by a heat treatment at 600 °C. To evaluate the coating application process, one-, two-, and three-layer coatings were tested in the artificial North German Basin (NGB), containing 166 g/L Cl−, at 150 °C and 1 M
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4

Fu, Guangyan, Yongzhao Wu, Qun Liu, Rongguang Li, and Yong Su. "Hot Corrosion Behavior of Stainless Steel with Al-Si/Al-Si-Cr Coating." High Temperature Materials and Processes 36, no. 3 (2017): 243–48. http://dx.doi.org/10.1515/htmp-2015-0154.

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AbstractThe 1Cr18Ni9Ti stainless steel with Al-Si/Al-Si-Cr coatings is prepared by slurry process and vacuum diffusion, and the hot corrosion behavior of the stainless steel with/without the coatings is studied under the condition of Na2SO4 film at 950 °C in air. Results show that the corrosion kinetics of stainless steel, the stainless steel with Al-Si coating and the stainless steel with Al-Si-Cr coating follow parabolic laws in several segments. After 24 h corrosion, the sequence of the mass gain for the three alloys is the stainless steel with Al-Si-Cr coating < the stainless steel with
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5

Rodič, Peter, Barbara Kapun, and Ingrid Milošev. "The Effect of Pore Sealing in a Multilayer Si–O–Zr/Al2O3 Coating Designed to Protect Aluminium from Corrosion." Metals 13, no. 12 (2023): 1960. http://dx.doi.org/10.3390/met13121960.

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This study deals with the combination of two corrosion protection strategies for aluminium: barrier protection (provided by a 3.8 μm thick hybrid sol–gel coating) and aluminium pore sealing via the use of a 100 nm thick layer of aluminium oxide. A Si–O–Zr hybrid sol–gel coating (TMZ) was synthesised by combining two separately prepared sols (i) tetraethyl orthosilicate and 3-methacryloxypropyl trimethoxysilane and (ii) zirconium(IV) n-propoxide chelated with methacrylic acid. The synthesis of the Si–O–Zr hybrid sol–gel was evaluated at various stages using real-time infrared spectroscopy. A 10
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6

Grigoriev, Sergey, Catherine Sotova, Alexander Metel, et al. "Wear Resistance and Failure Mode of Coatings Based on the ZrN System with the Introduction of Ti, Nb, and Hf Deposited on a Titanium Alloy Substrate." Metals 15, no. 2 (2025): 163. https://doi.org/10.3390/met15020163.

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The article presents the results of a comparison of the wear resistance of coatings with a two-layer architecture (adhesion layer–wear-resistant layer) of Zr-ZrN, Zr-(Zr,Ti)N, Zr,Hf-(Zr,Hf)N, Zr,Nb-(Zr,Nb)N, Zr,Hf-(Ti,Zr,Hf)N, and Zr,Nb-(Ti,Zr,Nb)N coatings, deposited on a titanium alloy substrate. The wear resistance was studied using two different counterbodies: Al2O3 and steel. When in contact with the Al2O3 counterbodies, the best wear resistance was demonstrated by samples with Zr,Hf-(Zr,Hf)N and Zr,Nb-(Zr,Nb,Ti)N coatings. In tests conducted in contact with the steel counterbody, the bes
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7

Bai, Hui Ping, Fu Hui Wang, and Yuan Qiang Tu. "The Electrochemical Behavior of the Rehealing Oxide Scales After Pitting Corrosion." Advanced Materials Research 476-478 (February 2012): 1399–402. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1399.

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The electrochemical behaviour of the rehealing oxide scales on the K52 nanocrystalline coatings had been studied by polarization curves. The results indicated that the oxide scales formed on the nano-coating exhibited rehealing ability after pitting corrosion, and the coating still had excellent corrosion resistance. The rehealing ability was enhanced with prolonged re-oxidation time. EDX analyses revealed that the oxide scales within the pits were composed of mixed-oxides (Cr2O3, Al2O3 and TiO2). The mixed-oxides were made up of two layers: the external oxide layer was composed of Cr2O3 and T
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8

Zhang, Chen, Bingying Wang, Xiaoyong Sun, et al. "Study of Hot-Dip Aluminium Plating Based on Micro-Morphology and Coating Bond Strength." Coatings 14, no. 10 (2024): 1257. http://dx.doi.org/10.3390/coatings14101257.

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Hydrogen barrier coatings with Al2O3 as the main component are a good choice for solving the hydrogen embrittlement problem during hydrogen transportation in long-distance pipelines. However, the difference in the coefficients of thermal expansion between the substrate and the Al2O3 coating limits its further utilisation and development. In this study, rare earth oxides were added to the molten aluminium solution, and a Fe-Al transition layer was introduced on the surface of X80 steel by hot-dip plating to solve the thermal mismatch. Here, the microstructure and bonding strength of the hot-dip
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9

Donkov, N., A. Zykova, V. Safonov, S. Dudin, S. Yakovin, and D. Dimov. "Structural and mechanical properties of magnetron-sputtering-deposited Ta- and Al- based coatings – a comparative analysis." Journal of Physics: Conference Series 2487, no. 1 (2023): 012039. http://dx.doi.org/10.1088/1742-6596/2487/1/012039.

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Abstract A comprehensive evaluation of the structure and the nano-mechanical characteristics of single and two-layer nano-structured coatings AlN/Al2O3, TaN/Ta2O5 grown on the surface of metallic materials. The formation of a two-layer structure improves the mechanical and tribological properties of the coating-substrate system, such as the plastic deformation resistance and anti-wear performance. The results indicate that the proposed two-layer nanostructured nitride-oxide coatings based on aluminum and tantalum are promising candidates for biomedical applications.
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10

Su, Linfen, Guanqun Zhuo, Haiwen Song, Jianyong Yang, and Kaiyong Jiang. "Effect of Al2O3 and SiO2 Inert-Fillers on the Microstructural Evolution and High Temperature Oxidation Resistance of B Modified Silicides Coatings Prepared by Pack Cementation Technology." Coatings 11, no. 6 (2021): 700. http://dx.doi.org/10.3390/coatings11060700.

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In this study, B modified silicide coatings were prepared on Nb-Si based alloy with Al2O3 or SiO2 inert-filler by pack cementation technology. Both coatings primarily consisted of a (Nb,X)Si2 with a (Nb,X)B2 + (Nb,X)Si2 outer layer. After oxidation at 1250 °C for 100 h, the coatings showed good oxidation resistance due to the formation of a dense silica. The oxidation products of the coating prepared with Al2O3 inert-filler consisted of SiO2, TiO2 and Cr2O3, while that of the coating prepared with SiO2 inert-filler consisted of SiO2, TiO2, Cr2O3, and HfO2. The different oxidation products may
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11

Zimmerman, J., Z. Lindemann, D. Golański, T. Chmielewski, and W. Włosiński. "Modeling residual stresses generated in Ti coatings thermally sprayed on Al2O3 substrates." Bulletin of the Polish Academy of Sciences: Technical Sciences 61, no. 2 (2013): 515–25. http://dx.doi.org/10.2478/bpasts-2013-0051.

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Abstract There is described a method of modeling by the finite element method the residual stresses induced during thermal deposition of coatings. The simulation was performed in two stages. The first dynamic stage simulated the impacts of the individual particles of the coating material onto the substrate, and the next static stage included a non-linear thermo-mechanical analysis intended for simulating the process of layer-by-layer deposition of the coating, with a specified thickness, and then cooling the entire system to the ambient temperature. In the computations, the samples were assume
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12

Aini, Kurotun, Fina Fitratun Amaliyah, Eni Sugiarti, et al. "The Effect of Single and Double-Doped Addition on 8YSZ Coating Layers Deposited on Inconel 625 by Electrophoretic Deposition." Metalurgi 39, no. 2 (2025): 97. https://doi.org/10.55981/metalurgi.2024.770.

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The ceramic layers of 8 mol% yttria-stabilized zirconia (8YSZ), singly doped with Fe2O3 and doubly doped with Fe2O3 and Al2O3, have been deposited successfully on Inconel 625 substrates by the EPD (electrophoretic deposition) process. The oxide doping influenced the stability of the EPD suspension and affected the density of the resultant layer. In order to improve the adhesion between the layer and the substrate, a two-step sintering was performed up to 1200 ºC for a total duration of 4 hours in a horizontal vacuum furnace, with a heating rate of 2 ºC per minute in an Argon gas atmosphere. FE
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13

Yan, Huan, Lei Li, HongLei Hu, and Wen Huang. "Influence of Al2O3 and h-BN on Wear and Corrosion Performance of IN625 Nickel-Based Coating." Coatings 14, no. 11 (2024): 1359. http://dx.doi.org/10.3390/coatings14111359.

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IN625 offers high-temperature oxidation resistance, wear resistance, and stable chemical properties. To improve the corrosion and wear resistance of the Q345B steel surface, two types of metal matrix composites (IN625 + 1% Al2O3 and IN625 + 1% h-BN) were applied to the substrate surface using the laser cladding process. This study analyzed the hardness, electrochemical corrosion, friction, and wear properties of both the laser-clad specimens and the substrates. The results show that (1) the hardness and wear resistance of the fusion-coated coating were significantly improved compared with the
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14

Park, Sang Hyun, Sang Won Myong, Yeon Gil Jung, and Ung Yu Paik. "Microstructural Evaluation and Mechanical Properties of Al2O3/ZrO2 Layered Structure with Graded Interlayers." Solid State Phenomena 124-126 (June 2007): 1353–56. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1353.

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Layered structure with composition gradient between inner layer of alumina (Al2O3) and outer layer of zirconia ( ZrO2-3mol% Y2O3 ;TZ-3Y) was fabricated using a gel casting process for the inner layer and a dip coating process for the outer layer in an aqueous system. The interlayer with composition gradient was prepared by mixing the Al2O3 and TZ-3Y slips as a volume ratio. Dried green bodies of the inner layer were pre-sintered at 1100°C for 5hr. After pre-wetting the pre-sintered bodies, the dip coating was preformed with mixed slips. Two kinds of composition gradients in the interlayer were
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15

Zeng, Siqi, and Faguo Li. "Study on the Influence Law of Ce on Microstructure and High-Temperature Oxidation Resistance of Ti-Al-Si Composite Coating." Coatings 13, no. 7 (2023): 1244. http://dx.doi.org/10.3390/coatings13071244.

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High-temperature titanium alloys are widely used in aerospace hot parts; however, the thermal barrier temperature of 600 °C limits its service temperature. In this paper, a two-step hot-dip plating method is proposed to prepare the composite coating containing Ce on the surface of titanium alloy, which can make the oxidation resistance temperature of titanium alloy reach 800 °C The microstructure, phase composition, and element distribution of Ce-containing Ti-Al-Si hot-dip coating, Ce-containing Ti-Al-Si pre-oxidation coating and Ce-containing Ti-Al-Si high-temperature oxidation coating were
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16

Dearnley, P. A., E. Kern, and K. L. Dahm. "Wear response of crystalline nanocomposite and glassy Al2O3-SiC coatings subjected to simulated piston ring/cylinder wall tests." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 219, no. 2 (2005): 121–37. http://dx.doi.org/10.1243/146442005x10300.

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The present paper describes the major part of a recent research investigation whose main purpose was to develop a series of novel functional coatings based on the Al2O3-SiC system that ideally would have a nanocomposite microstructure. Such coatings should be well suited for the wear protection of steel and cast-iron piston rings used in automotive internal combustion engines. Two methods were investigated: (i) plasma spraying and (ii) magnetron sputtering. The former was applied to cast-iron and plain carbon steel, whereas the latter was applied to stainless steel piston rings. The plasma spr
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17

Liu, Lin, Bo Qin Gu, and Ye Chen. "Effect of Plasma Sprayed Ceramic and Cermet Coatings on Wear-Out Failure of High Temperature Ball Valve." Key Engineering Materials 373-374 (March 2008): 11–14. http://dx.doi.org/10.4028/www.scientific.net/kem.373-374.11.

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Three kinds of coating materials, namely Cr2O3 ceramic, Al2O3-TiO2 ceramic and WC-Co cermet, were screened and sprayed on the surface of valve ball by plasma spraying technology, and two kinds of brush plating materials, namely high speed nickel and nickel tungsten, were also screened and brush plated on the surface of valve seat by electrical brush technology. The microstructure and morphology of the plasma sprayed coatings were analyzed by means of scanning electron microscopy. The tribological properties of the plasma sprayed coatings sliding against the high speed nickel and nickel tungste
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18

Shu‐hao, Deng, Yi Dan‐qing, Gong Zhu‐qing, and Su Yu‐chang. "Influence of potential on the structure and properties of microarc oxidation coating on Mg alloy." Anti-Corrosion Methods and Materials 55, no. 5 (2008): 264–69. http://dx.doi.org/10.1108/00035590810903854.

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PurposeTo obtain an optimized microarc oxidation (MAO) coating on magnesium alloy from an environmentally‐friendly electrolyte free of Cr6 + and PO43− and to investigate the influence of oxidation potential on the morphology, composition, structure, and other properties such as micro‐hardness and corrosion resistance.Design/methodology/approachA constant potential regime was applied to produce the coatings and scanning electron microscopy, energy dispersive spectroscope, X‐ray diffraction, hardness testing and electrochemical methods were used to study coating properties.FindingsThe results cl
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19

Wang, Shuang Xi, W. Y. Gao, T. C. Ma, Kai Ming Liang, and X. H. Zhang. "The Monolithic Glass-Ceramic Lined Steel Elbow Made by SHS Gravitational-Thermite Process." Key Engineering Materials 280-283 (February 2007): 1631–34. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1631.

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A monolithic glass-ceramic lined steel elbow with 900-bend angle was fabricated using a self-propagating high-temperature synthesis gravitational-thermite process (SHS G-T process). The manufacture principle and some technologies were introduced. Experiment results showed that the inner surface of the composite elbow was smooth and there were no visible cracks and pores in it. The coating layer was symmetry and was of ~ 2.5 mm thick. It consisted of two zones (glass-like zone, columnar zone) and that there existed three phases (Al2O3, glass and Fe particles) in both of the two zones. However,
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20

Kovač, Pavel, Borislav Savković, Dušan Jesić, and Ildico Mankova. "ON THE ABRASIVE WEAR HIGH STRENGTH COATING LAYERS ON MACHINE PARTS TESTING." Archives for Technical Sciences 2, no. 27 (2022): 25–31. http://dx.doi.org/10.59456/afts.2022.0227.025k.

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<p>Plasma coating technology was applied to machine parts. During application, the jet formed hits the surface of the material and particles are deposited on the surface. In this way, layers of high thickness can be applied and thus revitalize worn machine parts. The paper examines the abrasion resistance of Al2O3 and Al2O3 phosphate layers applied to the base material using plasma technology. The abrasion resistance of the applied layers was tested using the ASTM G 65-85 method. The results of the tests on the loss of the material due to abrasion wear for the two types of coatin
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21

Zagula-Yavorska, Maryana. "Oxidation Behavior of Non-Modified and Rhodium- or Palladium-Modified Aluminide Coatings Deposited on CMSX-4 Superalloy." Metals 8, no. 8 (2018): 613. http://dx.doi.org/10.3390/met8080613.

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Rhodium-modified as well as palladium-modified and non-modified aluminide coatings on CMSX-4 Ni-based superalloy were oxidized in air atmosphere at 1100 °C. Uncoated substrate of CMSX-4 superalloy was also oxidized. The microstructure of coatings before oxidation consists of two layers: an additive and an interdiffusion one. The NiAl intermetallic phase was found in the microstructure of non-modified coatings, while the (Ni,Rh)Al intermetallic phase was observed in the microstructure of rhodium-modified aluminide coatings before oxidation. The (Ni,Pd)Al phase of palladium-modified aluminide co
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22

Lim, Ki-Seong, Tae-Soo Jang, Jae-hyeon Jeong, Sung-Hwan Hong, and Joo Jin. "Effect of Interlayer on Flatness and Adhesion of Aerosol-Deposited Yttrium Oxide Coating." Materials 17, no. 14 (2024): 3533. http://dx.doi.org/10.3390/ma17143533.

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In this study, Y2O3 coating is used as an interlayer between Al2O3 substrate and a ceramic coating; this is in order to minimize the morphological distortion produced by a single deposition of the ceramic coating on the Al2O3 substrate, which is performed using the aerosol method. The interlayer coating, which comprises the Y2O3 phase, is deposited on the Al2O3 substrate using an e-beam evaporator. The crystal structure of the powder that was used to process the coating is identified as cubic Y2O3. In contrast, the crystal structure of the top-coating layer and interlayer indicates the presenc
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23

Sung, James C., and Ming Chi Kan. "The In-Situ Dressing of CMP Pad Conditioners with Novel Coating Protection." Materials Science Forum 534-536 (January 2007): 1133–36. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.1133.

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Kinik Company pioneered diamond pad conditioners protected by DLC barrier (DiaShield® Coating) back in 1999 (Sung & Lin, US Patent 6,368,198) and there has been no follower since then. Kinik's offered two varieties of DiaShield® Coatings: ultrahard tetrahedral amorphous carbon and superhard hydrogenated DLC. Kink also evaluated Cermet Composite Coating (CCC or C3, patent pending). C3 is unique that the coating composition grades from a metallic (e.g. stainless steel) under layer to a ceramic (e.g. Al2O3 or SiC) exterior. The metallic under layer can form metallurgical bond with metallic ma
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24

He, Li Min. "Effects of EB-PVD Process TGO Formation and Growth within Thermal Barrier Coatings." Materials Science Forum 546-549 (May 2007): 1781–88. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1781.

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It has been found that under oxygen partial pressure of ~2×10-6 kPa, the high-temperature oxidation of thermal barrier coatings (TBCs) occurred during an electron beam physical vapor deposition (EB-PVD) process for producing the TBCs top ceramic coating. In the present investigation, two modified bond coats (BCs) of NiCrAlY with Si addition, and NiCrAlY with Co and Hf additions, were developed by Arc Ion-plating technique to study the effects of the EB-PVD process on thermally grown oxide (TGO) formation and growth. The isothermal and cyclic oxidation tests were conducted and the cross-section
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25

Nishimoto, Takumi, Shigenari Hayashi, and Toshio Narita. "Effect of Coatings on the Creep and Oxidation Behavior of TiAl Alloys at 1173K in Air." Materials Science Forum 522-523 (August 2006): 665–0. http://dx.doi.org/10.4028/www.scientific.net/msf.522-523.665.

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The effects of coatings on the creep and oxidation behavior of Ti-50Al alloy were investigated at 1173K in air at a constant loading of 30MPa. The coating was formed by a two-step Cr/Al diffusion treatment and consisted of an outermost TiAl2 layer, an outer Al-rich γ layer, an intermediate γ, Laves and β mixture layer, and a Cr diffusion zone. Creep tests were also carried out with sole Cr or Al coated TiAl and also of uncoated TiAl. The oxide scales formed on the uncoated TiAl and the sole Cr coated specimens were a mixture of TiO2 and Al2O3, which displayed several exfoliations. Both the two
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26

Malinovschi, Viorel, Alexandru Horia Marin, Catalin Ducu, et al. "Improvement of Mechanical and Corrosion Properties of Commercially Pure Titanium Using Alumina PEO Coatings." Coatings 12, no. 1 (2021): 29. http://dx.doi.org/10.3390/coatings12010029.

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In this study, the surface of commercially pure titanium (Cp-Ti) was covered by a 21–95 µm-thick aluminum oxide layer using plasma electrolytic oxidation. Coating characterization revealed the formation of nodular and granular α- and γ-Al2O3 phases with minor amounts of TiAl2O5 and Na2Ti4O9 which yielded a maximum 49.0 GPa hardness and 50 N adhesive critical load. The corrosion resistance behavior in 3.5 wt.% NaCl solution of all plasma electrolytic oxidation (PEO) coatings was found to be two orders of magnitude higher compared to bare Ti substrate.
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27

Cuevas, Ana, María Martínez de Yuso, Víctor Vega, Ana González, Víctor Prida, and Juana Benavente. "Influence of ALD Coating Layers on the Optical Properties of Nanoporous Alumina-Based Structures." Coatings 9, no. 1 (2019): 43. http://dx.doi.org/10.3390/coatings9010043.

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Optical changes associated with the surface coating of different metal oxides and nanolayers by the ALD technique of a nanoporous alumina structure (NPAS) obtained by the two-step anodization method were analyzed. The NPASs were coated with: (i) a single layer (SiO2 or TiO2), and (ii) a double layer of SiO2 plus Al2O3 or aluminum doped ZnO (AZO) to estimate the effect of surface layer coverage material, geometrical parameters (pore-size/porosity), and number of layers on light transmission/reflection. Chemical surface characterization of the different NPASs was carried out by analyzing XPS spe
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28

Sayed, Farheen N., Erik Björklund, Adam J. Lovett, et al. "Evolution of Phases at the Surface and Interface of Mn Based Spinel Cathode with Coating Layer - a Spectroscopic Investigation." ECS Meeting Abstracts MA2023-02, no. 5 (2023): 827. http://dx.doi.org/10.1149/ma2023-025827mtgabs.

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Surface modifications, commonly termed coatings or artificial interphases, are known to mitigate secondary reactions of charged cathodes with organic electrolyte and limit surface reconstruction. As a result, better electrochemical stability has been observed for coated cathodes in both liquid and solid electrolyte-based Li ion batteries (LIBs). However, these coatings, in contact with electrolyte, can be dynamic and evolve during processing stages or electrochemical cycling. In this work we investigate the interphases between spinel cathodes and two coating layers, LiNbO3 and Al2O3. The spine
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29

Widyastuti, Kusriantoko Parindra, Lilis Mariani, Hosta Ardhyananta, and Sulistijono. "Analysis of YSZ-Al2O3/YSZ Flame Sprayed Thermal Barrier Coating to Thermal Resistance." Advanced Materials Research 1112 (July 2015): 338–44. http://dx.doi.org/10.4028/www.scientific.net/amr.1112.338.

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TBC (Thermal Barrier Coating) with YSZ-Al2O3/YSZ as top coat (TC) and MCrAlY alloy as bond coat (BC) marked as YSZ-Al2O3/YSZ double layer TBC was used for thermal barrier material on rocket nozzle wall. Several test have been conducted (thermal test and SEM-EDX). Thermal test was divided into two part, Thermal Torch and Non-isothermal Oxidation Test which is used for measure the resistance of TBC structure against oxyacethylene flame penetration as a miniature of thermal static test for rocket nozzle until the specimen was failure and used to measure the resistance against non-isothermal oxida
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30

Subbotin, Olekcandr, Valerii Belozerov, and Valeria Subbotinа. "Influence of microarc machining on resizing of aluminum parts." Bulletin of Kharkov National Automobile and Highway University, no. 97 (September 5, 2022): 70. http://dx.doi.org/10.30977/bul.2219-5548.2022.97.0.70.

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Problem. The change of the sizes of the processed samples (aluminum alloys) after oxidation in alkaline-silicate electrolyte at the anode-cathode mode is studied in the work. The two-layer structure of aluminum alloys after MAO processing is shown. The change in the size of the parts is determined by the phase composition of the coating. Goal. The goal is study of the changes in the size of the processed samples (aluminum alloys) after oxidation in alkaline-silicate electrolyte at the anode-cathode mode. The change of the sizes of the processed samples (aluminum alloys) after oxidation in alka
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31

Kuliavas, Liudas Albinas. "Investigation of Wear of Ceramic Coating on Tool Steel 105WCr6." Solid State Phenomena 199 (March 2013): 442–47. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.442.

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Lifetime of details directly influences lifetime of machines and equipments. Details in most cases wear out, instead of collapse. Raise of their wear resistance is a perspective problem. The most economic way is drawing hard-wearing coverings on a surface of the details made of steel. In our work coverings from oxide ceramics (Al2O3 and Al2O3+TiO2) coatings, covered by gas-flame spraying on a surface of the specimens made from tool steels 105WCr6 were investigated. Before a conversion coating specimens were hardened and tempered, the surface was exposed to sandblasting, and the special sub lay
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32

Kahraman, Ayça Demirer, Fatih Kahraman, Osman Çulha, and Tuğçe Yağcı. "Effect of the substrate surface and coating powder hardness on the formation of a cold sprayed composite layer." Materials Testing 65, no. 1 (2023): 144–52. http://dx.doi.org/10.1515/mt-2022-0214.

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Abstract In this study, the powder hardness and substrate surface hardness on the coating formation in the cold spray process was investigated. The AA6082 aluminum alloy hardened by the shot-peening process was used as the base material. Two different metallic powders and a ceramic particle powder were used as powder materials with different hardness. Thus, the powder particles from different materials were sprayed onto the surface under the same spraying process conditions. In order to obtain a workpiece surface with different hardness values, shot-peening treatment was applied to the substra
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33

Shin, Suk Hoon, Chul Kim, Dong Gyu Ahn, Kwang Ho Kim, and Myung Chang Kang. "Oxidation Behavior and Cutting Performance between Ti0.75-Al0.25-N and Ti0.69-Al0.23-Si0.08-N Coated Tool through Measurement of Cutting Temperature." Materials Science Forum 569 (January 2008): 141–44. http://dx.doi.org/10.4028/www.scientific.net/msf.569.141.

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Ti-Al-Si-N and Ti-Al-N coatings were deposited on WC-Co substrates by a DC magnetron sputtering method. The oxidation behavior of two kinds of Ti0.75Al0.25N and Ti0.69Al0.23Si0.08N coatings were comparatively investigated by XRD patterns and GDOES depth profiles. Si addition of 8 at.% into Ti-Al-N film modified its microstructure to a fine composite comprising, Ti-Al-N crystallites and amorphous Si3N4, and to a smoother surface morphology. While the solid solution Ti0.75Al0.25N film had superior oxidation resistance up to around 700°C, the composite Ti-Al-Si-N film showed further enhanced oxid
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34

Viertiö, Tyko, Viivi Kivelä, Matti Putkonen, Johanna Kihlman, and Pekka Simell. "Atomic Layer Deposition Coated Filters in Catalytic Filtration of Gasification Gas." Catalysts 11, no. 6 (2021): 688. http://dx.doi.org/10.3390/catal11060688.

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Steel filter discs were catalytically activated by ALD, using a coating of supporting Al2O3 layer and an active NiO layer for gas cleaning. Prepared discs were tested for model biomass gasification and gas catalytic filtration to reduce or eliminate the need for a separate reforming unit for gasification gas tars and lighter hydrocarbons. Two different coating methods were tested. The method utilizing the stop-flow setting was shown to be the most suitable for the preparation of active and durable catalytic filters, which significantly decreases the amount of tar compounds in gasification gas.
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35

Zhang, Yafang, Xiaojun Zhou, Huichao Cheng, Zhanji Geng, and Wei Li. "Fabrication and Oxidation Resistance of a Novel MoSi2-ZrB2-Based Coating on Mo-Based Alloy." Materials 16, no. 16 (2023): 5634. http://dx.doi.org/10.3390/ma16165634.

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To enhance the oxidation resistance of Mo-based TZM alloy (Mo-0.5Ti-0.1Zr-0.02C, wt%), a novel MoSi2-ZrB2 composite coating was applied on the TZM substrate by a two-step process comprising the in situ reaction of Mo, Zr, and B4C to form a ZrB2-MoB pre-layer followed by pack siliconizing. The as-packed coating was composed of a multi-layer structure, consisting of a MoB diffusion layer, an MoSi2-ZrB2 inner layer, and an outer layer of mixture of MoSi2 and Al2O3. The composite coating could provide excellent oxidation-resistant protection for the TZM alloy at 1600 °C. The oxidation kinetic curv
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36

Volosova, Marina, Valery Zhylinski, Catherine Sotova, et al. "Features of the Application of Coatings Based on the ZrN System to Increase Resistance to Mechanical Wear and Corrosion of Titanium Alloy Products." Coatings 14, no. 10 (2024): 1304. http://dx.doi.org/10.3390/coatings14101304.

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The coatings of ZrN, (Zr,Ti)N, (Ti,Zr,Hf)N and (Ti,Zr,Nb)N deposited on the titanium alloy substrate were compared. The wear resistance in the pin-on-disk test together with the Al2O3 indenter and the corrosion resistance in 3.5% NaCl solution were studied. It was found that the (Zr,Nb,Ti)N coating has the best resistance to wear, but has low corrosion resistance. The (Ti,Zr,Hf)N coating, on the contrary, has the best corrosion resistance, but low resistance to wear. The ZrN coating has good corrosion resistance combined with good resistance to wear. This coating is best suited for use in fric
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37

Narita, Toshio, Takeshi Izumi, Takumi Nishimoto, Yoshimitsu Shibata, Kemas Zaini Thosin, and Shigenari Hayashi. "Advanced Coatings on High Temperature Applications." Materials Science Forum 522-523 (August 2006): 1–14. http://dx.doi.org/10.4028/www.scientific.net/msf.522-523.1.

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To suppress interdiffusion between the coating and alloy substrate in addition to ensuring slow oxide growth at very high temperatures advanced coatings were developed, and they were classified into four groups, (1) the diffusion barrier coating with a duplex layer structure, an inner σ−(Re-Cr-Ni) phase as a diffusion barrier and outer Ni aluminides as an aluminum reservoir formed on a Ni based superalloy, Hastelloy X, and Nb-based alloy. (2) the up-hill diffusion coating with a duplex layer structure, an inner TiAl2 + L12 and an outer β-NiAl formed on TiAl intermetallic and Ti-based heat resi
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38

Yagi, Takahiro, Tomohiro Sasaki, Takehiko Watanabe, and Atsushi Yanagisawa. "Oxidation Resistance of Al-Rich Aluminide Coating on TiAl Based Alloy by Thermal Spray and Diffusion Treatment." Advanced Materials Research 409 (November 2011): 820–25. http://dx.doi.org/10.4028/www.scientific.net/amr.409.820.

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Al-rich aluminide coating on Ti-49.1at%Al alloys has been performed by two-step process of thermal aluminum spray and diffusion treatment. Effect of the diffusion time on the oxidation resistance, and the change of microstructures in the coating during the oxidation test in air at 900°C for 100 h were investigated. In the aluminized coating before the oxidation tests, formations of TiAl3 on the outer layer and an intermediate layer consisting of Ti2Al5, TiAl2, and Al-rich TiAl were observed. The intermediate layer developed by the diffusion treatment for 3600s. In the oxidation test over 50 h,
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39

Volkov, Oleg, Valeria Subbotina, Oleksandr Subbotin, Alexey Vasilchenko, and Mariy Shyogoleva. "Methods of Structural Engineering of Surface in Solving the Problems of Multifactorial Increase of the Level of Operational Characteristics of Materials." Solid State Phenomena 350 (October 6, 2023): 3–12. http://dx.doi.org/10.4028/p-pbmxh4.

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In the course of the study, several different methods of surface structural engineering are reviewed. The methods described in this paper are characterized by different process physics on the way to obtaining the result, but they are aimed at modifying the structure and properties of the surfaces to which they are applied. Among them, two different technological directions are considered. The first area involves technologies that include a friction component, namely thermofriction treatment (TFT) for thermofriction strengthening (TFS), additional thermofriction strengthening (ATFS) or thermofr
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40

Yang, Wonchul, Choong-Heui Chung, Sangyeob Lee, et al. "Microstructures and Oxidation Behaviors of Silicide Coated Nb Alloys by Halide Activated Pack Cementation Process." Korean Journal of Metals and Materials 58, no. 8 (2020): 507–14. http://dx.doi.org/10.3365/kjmm.2020.58.8.507.

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In this study, we tried to improve the oxidation resistance of Nb-12Si (wt%) alloys at 1200 °C or higher through pack cementation coatings. Nb-12Si (wt%) alloys were prepared by arc-melting under Ar atmosphere. When the alloys were coated using pack powder mixtures composed of Si, Al2O3 and NaF, two silicide layers composed of NbSi2 and Nb5Si3 phases were successfully produced on the substrate. The Si-pack coatings were performed with various heat treatment temperatures and time conditions. The microstructures and thickness changes of the coating layers were analyzed to determine the growth be
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41

BOGDANOV, A. I., V. P. KULEVICH, V. G. SHMORGUN, M. A. RAZUVAEV, and I. A. SOKOLENKO. "INVESTIGATION OF THE POST-THERMAL TREATMENT EFFECT ON THE STRUCTURE OF THE ALITIZED LAYER ON VT1-0 TITANIUM." IZVESTIA VOLGOGRAD STATE TECHNICAL UNIVERSITY, no. 10 (293) (October 2024): 10–14. http://dx.doi.org/10.35211/1990-5297-2024-10-293-10-14.

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The study results of the post-heat treatment effect on the structure of the aluminized layer on VT1-0 titanium are presented. It is shown that the coating after heat treatment at 700 and 850 °C for 20 h consists of two layers. In the outer layer, rounded TiAl3 particles are separated by aluminum oxide Al2O3. A continuous diffusion zone of ~10 μm thickness is formed at the boundary with titanium, consisting of several layers representing TiAl2, TiAl and Ti3Al aluminides.
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42

Srikousik, SB., and K. Muthukumar. "Experimental Study on Wear Resistance Behavior in Ceramic Coated and Uncoated Rotary Air Lock." Journal of Ceramics and Concrete Sciences 4, no. 2 (2019): 18–24. https://doi.org/10.5281/zenodo.3046553.

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The study presents the output on wear resistance of a ceramic coating on rotary air lock (RAL) in a cement plant located in southern part of India. To analyze the wear resistance properties, the observation was conducted in two different rotary air lock components out of one which is coated with a ceramic layer containing 60% Al2O3 and 40% TiO2; the ceramic coating was done by an atmospheric plasma spraying method. The obtained results from the weight loss test of the uncoated rotary airlock device and the coated rotary air lock indicate that the rotary air lock with a ceramic coating is chara
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43

Esposito, Salvatore, Antonio D’Angelo, Claudia Diletto, et al. "Solar Selective Absorber Coating with Ag Infrared Reflector for Receiver Tubes Operating at 550 °C." Energies 18, no. 4 (2025): 880. https://doi.org/10.3390/en18040880.

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The present work introduces a new solar selective absorber coating (SSAC) for the receiver tube of Concentrated Solar Power (CSP) systems, proposing silver as an infrared reflector for application at 550 °C. In the past, the Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA) has developed SSACs suitable for applications at 550 °C, featuring solar absorbers based on graded multilayer cermet of WN-AlN and W-Al2O3 and an infrared reflector of tungsten. Although these coatings ensured properly stable photothermal performance at 550 °C, due to the low t
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44

Szindler, M., L. A. Dobrzański, M. M. Szindler, M. Pawlyta, and T. Jung. "Comparison of surface morphology and structure of Al2O3 thin films deposited by sol-gel and ALD methods." Journal of Achievements in Materials and Manufacturing Engineering 2, no. 82 (2017): 49–57. http://dx.doi.org/10.5604/01.3001.0010.2354.

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Purpose: of this research was examination Al2O3 thin film obtained with two different method, by sol-gel and ALD, and comparison the surface morphology and structure of deposited thin films. The films deposited on the monocrystalline silicon were tested for their suitability for use in silicon solar cells. Design/methodology/approach: Trimethylaluminum (TMA) was used as a precursor of Al2O3 which is reacted with water enabled the deposition of thin films by ALD method. By the sol-gel method the aluminium tri-sec butoxide (TBA) was used as a precursor to obtain Al2O3 thin films. The aluminium o
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45

Bejinariu, Costică, Viorel Paleu, Ciprian Vasile Stamate, et al. "Microstructural, Corrosion Resistance, and Tribological Properties of Al2O3 Coatings Prepared by Atmospheric Plasma Spraying." Materials 15, no. 24 (2022): 9013. http://dx.doi.org/10.3390/ma15249013.

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An usual material, EN-GJL-250 cast iron, used for automotive braking systems, was covered with a ceramic material (105NS-1 aluminium oxide) using an industrial deposition system (Sulzer Metco). The main reason was to improve the corrosion and wear (friction) resistance properties of the cast-iron. Samples were prepared by mechanical grinding and sandblasting before the deposition. We applied two and four passes (around 12–15 µm by layer) each at 90° obtaining ceramic coatings of 30 respectively 60 µm. The surface of the samples (with ceramic coatings) was investigated using scanning electron m
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46

Zheng, Zheng Hua, Yong Yao Lv, and Hui Ping Bai. "The Rehealing Ability of Oxide Scales on K52 Nanocrystalline Coating after Pitting Corrosion." Advanced Materials Research 538-541 (June 2012): 354–58. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.354.

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The rehealing ability of the oxide scales on sputter-deposited Ni-based K52 nanocrystalline coatings after pitting corrosion had been studied by polarization curves in 3.5% NaCl solution. The results indicated that the oxide scales formed on the nano-coatings exhibited excellent rehealing ability after pitting corrosion, and the rehealing oxide scales still had high corrosion resistance. The rehealing ability was declined with longer immersion time in the chloride solution. EDX analyses revealed that the oxide scales within the pits were composed of mixed-oxides. The mixed-oxides were made up
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47

Tanno, Masatoshi, Kazuhiro Ogawa, and Tetsuo Shoji. "Effect of Cerium and Silicon Additions to MCrAIY on the High-Temperature Oxidation Behavior and Bond Strength of Thermal Barrier Coatings." Key Engineering Materials 261-263 (April 2004): 1061–66. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1061.

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It is well known, that thermally grown oxide (TGO) forms at the interface between the thermal barrier top coating (TBC) and the bond coating during service. In previous work, SEM images showed that the TGO layer contained at least two layers with different oxides. One layer was Al2O3, and the other was a mixed oxide of NiO, CoO, Cr2O3, and their spinels. It was supposed that a reason for macro-crack formation near an interface is due to a decrease in bond strength or to the formation of stress concentration sites caused by the formation of pores in the mixed oxide. In order to improve the bond
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48

Yáñez-Contreras, Pedro, Miguel León-Rodríguez, Francisco Javier Santander-Bastida, José Martín Medina-Flores, José Alfredo Jiménez-García, and Vignaud Ganados-Alejo. "Study of the Evolution of the Residual Stresses in Thermal Barrier Coatings from Manufacturing to Its Operation Work." Coatings 12, no. 8 (2022): 1068. http://dx.doi.org/10.3390/coatings12081068.

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Residual stresses’ magnitude generated by deposition, quenching stress, thermal stress operation temperature, and infiltration in the thermal barrier coating (TBC) of gas turbines was determined. A thermal barrier coating was manufactured by the deposition of two layers, CoNiCrAlY and yttria-stabilized zirconia (YSZ), on an AISI 304 stainless steel substrate. The CoNiCrAlY was deposited by using an HVOF gun and the YSZ by an atmospheric plasma spray (APS). The TBCs were heat-treated at 1250 °C, with a CMAS (CaO, MgO, Al2O3, and SiO2) attack with a concentration of 10 mg/cm2 for 6 h in order to
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49

Korzekwa, Joanna, Robert Matczuk, Kinga Hubkiewicz, Marek Bara, Mateusz Niedźwiedź, and Dariusz Bochenek. "Influence of Research Factors and Al2O3 Layer Production Parameters on Tribological and Microstructural Properties." Lubricants 11, no. 7 (2023): 286. http://dx.doi.org/10.3390/lubricants11070286.

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The exclusion of systems supplying the lubricant from the outside makes it necessary to replace traditional sliding pairs with materials containing a lubricant component. Such solutions are carried out to prevent the formation of material tacks and, consequently, of adhesive wear, which must be avoided. The article presents the influence of research factors and parameters of Al2O3 layer production on tribological and microstructural properties. The input variables for the tests were the admixture of WS2 to the electrolyte, the type of sputtering of the samples for SEM tests, and the load on th
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50

Schubert, Michael, Manuel Hahn, Jörg Exner, Jaroslaw Kita, and Ralf Moos. "Effect of substrate hardness and surface roughness on the film formation of aerosol-deposited ceramic films." Functional Materials Letters 10, no. 04 (2017): 1750045. http://dx.doi.org/10.1142/s179360471750045x.

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The aerosol deposition (AD) method is a novel ceramic coating technique that allows manufacturing of dense ceramic films at room temperature directly from ceramic powders without any high temperature sintering steps and without expensive (ultra) high vacuum processes. The deposition mechanism can be separated into two stages: the creation of an anchor layering and the subsequent film formation. Step one involves an initial plastic deformation of the substrate surface by the first impacting particles. Especially in the first stage, substrate properties affect the deposition and determine the do
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