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Статті в журналах з теми "Slurry aluminizing"

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Автор: Grafiati
Опубліковано: 14 липня 2022

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1

Omar, H., D. P. Papadopoulos, S. A. Tsipas, and H. Lefakis. "Aluminizing nickel foam by a slurry coating process." Materials Letters 63, no. 16 (June 2009): 1387–89. http://dx.doi.org/10.1016/j.matlet.2009.02.069.

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2

Indacochea, J. Ernesto, Ira Bloom, Michael Krumpelt, and Thomas G. Benjamin. "A comparison of two aluminizing methods for corrosion protection in the wet seal of molten carbonate fuel cells." Journal of Materials Research 13, no. 7 (July 1998): 1834–39. http://dx.doi.org/10.1557/jmr.1998.0260.

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Анотація:
The corrosion behavior of aluminized Type 310S stainless steel (SS) in the wet seal of molten carbonate fuel cells was investigated. Coupons of Type 310S SS were aluminized by two different aluminizing methods: thermal spray and slurry-coating. In both types of samples Fe and Cr diffused readily into the Al layer at 650 °C. At first this interdiffusion is limited to the interfacial area. With time, Fe and Cr aluminides precipitate in the Al layer. The slurry-coated layer contains a higher concentration of FeAl and Fe3Al than does the thermal spray layer. Consequently, the slurry-coated layer also displays a greater degree of corrosion than the thermal spray layer.
3

WANG, HONGXING, CHENGLIN CHU, XIAOBO SHENG, PINHUA LIN, and YINSHENG DONG. "EFFECT OF AL CONTENT ON MICROSTRUCTURE AND PROPERTIES OF AN INTERMETALLIC Ni-Ti (Al) COMPOUND/Ni GRADED COATING DEPOSITED ON COPPER SUBSTRATE." International Journal of Modern Physics B 23, no. 06n07 (March 20, 2009): 1916–23. http://dx.doi.org/10.1142/s0217979209061834.

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Copper and its alloys with high electrical and thermal conductivity are a group of widely used engineering materials in numerous applications. In order to improve the tribological properties of copper substrate, an electroplating nickel layer was firstly deposited on copper substrate, subsequently these electroplated specimens were treated by slurry pack cementation process at 900°C for 12 h using a slurry mixture composed of TiO 2 as titanizing source, pure Al powder as aluminzing source and also a reducer for titanizing, an activator of NH 4 Cl and albumen (egg white) as cohesive agent. The effect of Al content on the microstructure and the properties of the coating has been studied. The results showed that an intermetallic Ni - Ti ( Al ) compound/ Ni graded layer was formed on copper substrate after slurry pack cementation process. With the rise of Al content in slurry mixture, the microhardness of the graded coating increased and the friction coefficient decreased from 0.35 to 0.18, at the same time, the slurry pack process gradually transited from the titanizing process to an aluminizing one. Correspondingly the main phases of the coating were changed from Ni - Ti intermetallic compounds into Ni - Al ones.
4

Lee, Young-Ki, Jung-Yeul Kim, and You-Kee Lee. "Convenient Aluminizing Process of Steel by Using Al-Ti Mixed Powder Slurry." Korean Journal of Materials Research 19, no. 4 (April 27, 2009): 207–11. http://dx.doi.org/10.3740/mrsk.2009.19.4.207.

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5

Rannou, B., F. Velasco, S. Guzmán, V. Kolarik, and F. Pedraza. "Aging and thermal behavior of a PVA/Al microspheres slurry for aluminizing purposes." Materials Chemistry and Physics 134, no. 1 (May 2012): 360–65. http://dx.doi.org/10.1016/j.matchemphys.2012.03.002.

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6

Bouchaud, Baptiste, Benoit Rannou, and Fernando Pedraza. "Slurry aluminizing mechanisms of Ni-based superalloys incorporating an electrosynthesized ceria diffusion barrier." Materials Chemistry and Physics 143, no. 1 (December 2013): 416–24. http://dx.doi.org/10.1016/j.matchemphys.2013.09.022.

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7

Soleimani Dorcheh, A., and M. C. Galetz. "Slurry aluminizing: A solution for molten nitrate salt corrosion in concentrated solar power plants." Solar Energy Materials and Solar Cells 146 (March 2016): 8–15. http://dx.doi.org/10.1016/j.solmat.2015.11.024.

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8

Kepa, Thomas, Fernando Pedraza, and Fabien Rouillard. "Intermetallic formation of Al-Fe and Al-Ni phases by ultrafast slurry aluminization (flash aluminizing)." Surface and Coatings Technology 397 (September 2020): 126011. http://dx.doi.org/10.1016/j.surfcoat.2020.126011.

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9

Promdirek, Piyorose, Mack Boonpensin, and Thanapon Rojasawasatien. "Improvement of Slurry Aluminide Coating on Ferritic Stainless Steel AISI430 for High-Temperature Oxidation Resistance." Key Engineering Materials 658 (July 2015): 86–90. http://dx.doi.org/10.4028/www.scientific.net/kem.658.86.

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One of the surface modification processes for high-temperature oxidation resistance is slurry aluminizing process, forming protective layer of alumina (Al2O3). However, several important parameters such as annealing times and temperatures should be intensively considered. The objective of this study is to improve the process of slurry aluminide coating of ferritic stainless steels type AISI430 (16%Cr) combat to high-temperature oxidation. The specimens were cut, then ground, and finally sprayed with slurry mixture (Al powder + polyvinyl alcohol (PVA)). They were annealed in Ar at 1100°C for 15 minutes in order to eliminate PVA and form aluminide on their suface. The protective layer Al2O3 was finally formed in the temperature range of 900-1100 °C for 15-60 minutes. The cyclic oxidation tests were performed at 1000 °C for 24 hours. The surface morphology were then examined by XRD, SEM equipped EDS. The results showed that all oxidation kinetics of coated specimens were parabolic. The oxidation rate of uncoated specimens was apparently higher than that of coated specimens. Comparing with all coated specimens, the oxidation rate decreased with the increasing temperature and annealing time. In this study, the coating process at 1100°C for 60 minutes exhibited the lowest oxidation rate due to the most complete layer of Al2O3. The surface morphology showed the formation of continuous layer of Fe2Al5 and Al2O3, acting as barrier layer to oxide growth. Effect of temperature and time on oxidation resistance were discussed in this study.
10

Treewiriyakitja, Paweena, Sutep Joy-A-Ka, and Piyorose Promdirek. "Study of corrosion resistance of stainless steel AISI430 coated by slurry aluminizing in molten nitrate salt." Materials Today: Proceedings 5, no. 3 (2018): 9630–34. http://dx.doi.org/10.1016/j.matpr.2017.10.150.

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11

Bauer, Johannes Thomas, Xabier Montero, Michael Schütze, and Mathias Christian Galetz. "Innovative slurry coating concepts for aluminizing of an austenitic steel in chlorine and sulfur containing atmosphere." Surface and Coatings Technology 285 (January 2016): 179–86. http://dx.doi.org/10.1016/j.surfcoat.2015.10.074.

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12

Pedraza, F., M. Proy, C. Boulesteix, P. Krukovskyi, and M. Metel. "Slurry aluminizing of IN-800HT austenitic stainless steel and pure nickel. Correlations between experimental results and modelling of diffusion." Materials and Corrosion 67, no. 10 (February 16, 2016): 1059–67. http://dx.doi.org/10.1002/maco.201508758.

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13

Rannou, B., M. Mollard, B. Bouchaud, J. Balmain, G. Bonnet, Vladislav Kolarik, and F. Pedraza. "On the Influence of a Heat Treat for an Aluminizing Progress Based on Al Microparticles Slurry for Model Ni and Ni20Cr. Experimental and Theoretical Approaches." Defect and Diffusion Forum 323-325 (April 2012): 373–79. http://dx.doi.org/10.4028/www.scientific.net/ddf.323-325.373.

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The use of thermal barrier coating systems allows superalloys to withstand higher operating temperatures in aeroengine turbines. Aiming at providing oxidation protection to such substrates, an aluminum-rich layer is deposited to form the α-Al2O3scale over which a ceramic layer (i.e. YSZ layer) is applied to provide thermal insulation. A new approach is now being investigated within the FP7 European project « PARTICOAT », in which a single step process is employed by applying micro-sized aluminum particles. The particles are mixed in a binder and deposited by brushing or spraying on the substrate surface. During a heat treatment, the particles sinter and oxidize to form a top coat composed of hollow con-joint alumina spheres and simultaneously, an Al-rich diffusion zone is formed in the substrate. For a better understanding of the diffusion / growth processes, preliminary tests were carried out on pure nickel and Ni20Cr model alloys prior to further application on commercial superalloys. The effect of the heat treatment on the coating characteristics (number of layers, thickness, composition, homogeneity, etc.) was particularly investigated to emphasize the mechanisms of diffusion governing the growth of the coatings. The establishment of the diffused layers occurred very readily even at intermediate temperatures (650 and 700°C). However, the layers formed did not match perfectly with the thermodynamic modeling because of the quick incorporation of Ni into molten Al at intermediate temperatures (650°C). In contrast, at higher temperatures (700 and 1100°C) the phases predicted by Thermocalc are in good agreement with the observed thickness of the diffused layers. The incorporation of Cr as an alloying element restrained Al ingress by segregation of Cr even at very low temperatures aluminizing temperatures (625°C).
14

Pei, Ji Bin, Li Wen Zhang, Jing Niu, and Quan Zhong Zhang. "Microstructure and Formation Mechanism of Aluminized Coatings on Nickel-Based Superalloys." Key Engineering Materials 373-374 (March 2008): 204–7. http://dx.doi.org/10.4028/www.scientific.net/kem.373-374.204.

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Aluminized coatings prepared on nickel-based superalloys can provide good protection against high temperature oxidation and hot corrosion. This study investigated the simple aluminized and silicon-aluminized coatings on nickel-based superalloy K4104. The simple aluminized coating was prepared by pack cementation and the Al-Si coating was prepared by slurry aluminizing, respectively. The microstructure of simple aluminized and Al-Si coatings was analyzed by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and electron probe microanalysis (EPMA). And the formation mechanism of simple aluminized and Al-Si coatings was discussed. The results showed that the simple aluminized coating was about 49 um thick and consisted of three layers. The outer layer mainly consisted of Al-rich β-NiAl. The intermediate layer consisted of Ni-rich β-NiAl and Cr-rich. The inner diffusion layer consisted of Cr-rich and γ’-Ni3Al. The microstructure of Al-Si coating showed that the coating was about 70 um thick and consisted of five layers. The Al-Si coating consisted of CrxSiy, Al-rich β-NiAl, Ni-rich β-NiAl, Cr-rich and γ’-Ni3Al. The microstructure of simple aluminized coating was compared with that of Al-Si coating in order to find out the effect of Si. Owing to the effect of Si, there was a Transition layer in Al-Si coating. The Al-Si coating was thicker than simple aluminized coating. The declining trend of the aluminum concentration in the Al-Si coating was smoother than that of the simple aluminized coating.
15

Jokar, Ali, Farzin Ghadami, Najmeh Azimzadeh, and Davood Salehi Doolabi. "Slurry Aluminizing Process of the Internal Passageways of Gas Turbine Blades: Investigation of High-Temperature Oxidation Behavior at 1000 ºC." SSRN Electronic Journal, 2021. http://dx.doi.org/10.2139/ssrn.3967530.

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