The Experts below are selected from a list of 147 Experts worldwide ranked by ideXlab platform
M. N. Sheiko - One of the best experts on this subject based on the ideXlab platform.
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Diamond Electroplated Coating with protection by diamond micron powder in a dressing tool. Part 1. Coating deposition conditions
Journal of Superhard Materials, 2017Co-Authors: M. N. Sheiko, V. N. SkokAbstract:The authors put forward a method of protection of diamond Electroplated Coating in a dressing tool made by the electroforming process. The method consists in using diamond micron powder in the surface layer of the nickel bond in order to protect the bond surface against hydroabrasive wear. The paper provides a procedure of calculation of nickel (the basis for the diamond Electroplated Coating) deposition conditions, taking into account the change in the free surface area of deposition due to cross-sectional area of diamond grains of the working fraction and the micron powder. The procedure permits computing the refill-deposition rate and duration, the final thickness of the Coating and its protective sublayer.
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Grain shape as a factor governing the parameters of diamond Electroplated Coating of dressing tools. Part 3. The simplest 3D model of a diamond grain—“A barrel made of parabolic and circular staves”
Journal of Superhard Materials, 2016Co-Authors: M. N. SheikoAbstract:The paper addresses the simplest 3D model—a barrel made of parabolic and circular staves—for a diamond grain in the Electroplated Coating of dressing tools. It is shown that the proposed concepts of a diamond grain shape provide, on the one hand, an adequate description (including the quantitative one) the experimentally found relations between the parameters of an Electroplated diamond Coating and, on the other hand, a more detailed information in order to produce Coatings with preset characteristics.
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grain shape as a factor governing the parameters of diamond Electroplated Coating of dressing tools part 2 actual grain graphite form contact area and related characteristics as input data for calculating the conditions of diamond Electroplated coati
Journal of Superhard Materials, 2016Co-Authors: M. N. Sheiko, V. N. Skok, O. O. PasichnyiAbstract:The paper gives experimental data on the actual contact area between grains and the graphite form used in the process of deposition of a diamond Coating onto a dressing tool by the electroforming method. Also, the authors provide the results of determination of the maximum section of diamond grains in the powders of different grain sizes, the specific number of grains on the surface and their orientation—the data needed for the calculation of the free surface area of nickel being deposited, and thus the deposition rate and time as well as the final thickness of the diamond Electroplated Coating.
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Grain shape as a factor governing the parameters of diamond Electroplated Coating of dressing tools. Part 2. Actual grain–graphite form contact area and related characteristics as input data for calculating the conditions of diamond Electroplated coa
Journal of Superhard Materials, 2016Co-Authors: M. N. Sheiko, V. N. Skok, O. O. PasichnyiAbstract:The paper gives experimental data on the actual contact area between grains and the graphite form used in the process of deposition of a diamond Coating onto a dressing tool by the electroforming method. Also, the authors provide the results of determination of the maximum section of diamond grains in the powders of different grain sizes, the specific number of grains on the surface and their orientation—the data needed for the calculation of the free surface area of nickel being deposited, and thus the deposition rate and time as well as the final thickness of the diamond Electroplated Coating.
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grain shape as a factor governing the parameters of diamond Electroplated Coating of dressing tools part 1 the tool body dimensional allowance to accommodate diamond Electroplated Coating
Journal of Superhard Materials, 2015Co-Authors: M. N. Sheiko, V. N. SkokAbstract:The paper gives some experimental data on the thickness of a single-layer Electroplated Coating with diamond grain size ranging from 250/200 to 800/630, which are necessary to calculate the dressing tool body dimensions to allow for electrodeposition of a diamond-containing Coating.
Jeanyves Hihn - One of the best experts on this subject based on the ideXlab platform.
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a challenge to succeed the electroplating of nanocomposite ni cr alloy onto porous substrate under ultrasonic waves and from a continuous flow titanium nanofluids
Journal of Alloys and Compounds, 2020Co-Authors: Wafa Sassi, H Boubaker, S Bahar, M Othman, A Ghorbal, R Zrelli, Jeanyves HihnAbstract:Abstract About 97% of the civil plane is constructed from Aluminum alloys inter alia, the removable arm of the landing gear which is making from galvanized steel (GS). Despite its strength and high performance against alkaline corrosion, the surface aspect of the GS was highly porous due to the manufacturing process. In this study, we report the first successful Electroplated Coating obtained under ultrasonic waves from a continuous-flow fluid containing the precursor metallic cations on relatively big pieces of aeronautic GS. Two main challenges have risen in this work: 1) Homogenous electrodeposition on a porous surface and 2) succeed a protection barrier against corrosion by electroplating a more noble alloy (NiCr) on a less noble layer (Zn). The comparison of GS and coated GS shows that the mixed nano-alloy covers the totality of the active surface of the sample. The optimized finished Coating contains 64% of Ni, 23% of Cr and 11% of nanoparticles TiO2. The rest is defined as impurities from the GS and/or from the main electrolyte. According to the laser profilometer measurements, 98% of pores have been crammed. Morphology, crystallinity and chemical bonds nature into the alloy have been also deeply investigated using SEM, XRD and XPS techniques, respectively. The corrosion resistance has been also tested under salty spray ( 3,5% NaCl).
V. N. Skok - One of the best experts on this subject based on the ideXlab platform.
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Diamond Electroplated Coating with protection by diamond micron powder in a dressing tool. Part 1. Coating deposition conditions
Journal of Superhard Materials, 2017Co-Authors: M. N. Sheiko, V. N. SkokAbstract:The authors put forward a method of protection of diamond Electroplated Coating in a dressing tool made by the electroforming process. The method consists in using diamond micron powder in the surface layer of the nickel bond in order to protect the bond surface against hydroabrasive wear. The paper provides a procedure of calculation of nickel (the basis for the diamond Electroplated Coating) deposition conditions, taking into account the change in the free surface area of deposition due to cross-sectional area of diamond grains of the working fraction and the micron powder. The procedure permits computing the refill-deposition rate and duration, the final thickness of the Coating and its protective sublayer.
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grain shape as a factor governing the parameters of diamond Electroplated Coating of dressing tools part 2 actual grain graphite form contact area and related characteristics as input data for calculating the conditions of diamond Electroplated coati
Journal of Superhard Materials, 2016Co-Authors: M. N. Sheiko, V. N. Skok, O. O. PasichnyiAbstract:The paper gives experimental data on the actual contact area between grains and the graphite form used in the process of deposition of a diamond Coating onto a dressing tool by the electroforming method. Also, the authors provide the results of determination of the maximum section of diamond grains in the powders of different grain sizes, the specific number of grains on the surface and their orientation—the data needed for the calculation of the free surface area of nickel being deposited, and thus the deposition rate and time as well as the final thickness of the diamond Electroplated Coating.
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Grain shape as a factor governing the parameters of diamond Electroplated Coating of dressing tools. Part 2. Actual grain–graphite form contact area and related characteristics as input data for calculating the conditions of diamond Electroplated coa
Journal of Superhard Materials, 2016Co-Authors: M. N. Sheiko, V. N. Skok, O. O. PasichnyiAbstract:The paper gives experimental data on the actual contact area between grains and the graphite form used in the process of deposition of a diamond Coating onto a dressing tool by the electroforming method. Also, the authors provide the results of determination of the maximum section of diamond grains in the powders of different grain sizes, the specific number of grains on the surface and their orientation—the data needed for the calculation of the free surface area of nickel being deposited, and thus the deposition rate and time as well as the final thickness of the diamond Electroplated Coating.
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grain shape as a factor governing the parameters of diamond Electroplated Coating of dressing tools part 1 the tool body dimensional allowance to accommodate diamond Electroplated Coating
Journal of Superhard Materials, 2015Co-Authors: M. N. Sheiko, V. N. SkokAbstract:The paper gives some experimental data on the thickness of a single-layer Electroplated Coating with diamond grain size ranging from 250/200 to 800/630, which are necessary to calculate the dressing tool body dimensions to allow for electrodeposition of a diamond-containing Coating.
Qingdong Zhong - One of the best experts on this subject based on the ideXlab platform.
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preparation of ni w sio2 nanocomposite Coating and evaluation of its hardness and corrosion resistance
Ceramics International, 2015Co-Authors: Yi Wang, Qiongyu Zhou, Ke Li, Qingdong ZhongAbstract:Abstract In this paper, nanocomposite Coatings were obtained by electrochemical codeposition of SiO 2 nano-particles (diameter 30–40 nm) with Ni–W on mild steel surface. The structure and microstructure of Coatings was separately analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The corrosion resistance of the samples was evaluated by potentiodynamic polarization (Tafel) and electrochemical impedance spectroscopy (EIS). Results indicated that nano-SiO 2 had a prodigious impact on the microstructure, composition and structure of Electroplated Coating by remarkable effect on its electrodeposition process. Ni–W–SiO 2 Coatings showed higher hardness in comparison with the Ni–W Coating. Hardness values of Ni–W–SiO 2 Coatings ranged from 768 to 823 HV and the Coating obtained in bath containing 10 g/L nano-SiO 2 showed a maximum hardness (about 823 HV). Apart from that, significant influence had been observed on corrosion resistance by the SiO 2 nano-particles. Electrochemical test results demonstrated that Ni–W–SiO 2 Coatings exhibited a generally less protective performance compared with amorphous Ni–W Coating.
Guang Nan Chen - One of the best experts on this subject based on the ideXlab platform.
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Interface fracture behavior of Electroplated Coating on metal substrate under compressive strain
Journal of Materials Processing Technology, 2009Co-Authors: Kai Zhang, Huai Xue Li, Guang Nan ChenAbstract:The inducement of interface fracture is crucial to the analysis of interfacial adhesion between Coating and substrate. For Electroplated Coating/metal substrate adhering materials with strong adhesion, interface cracking and Coating spalling are difficult to be induced by conventional methods. In this paper an improved bending test named as T-bend test was conducted on a model Coating system, i.e. Electroplated chromium on a steel substrate. After the test, cross-sections of the coated materials were prepared to compare the failure behaviors under tensile strain and compressive strain induced by T-bend test. And the observation results show that Coating cracking, interface cracking and partial spalling appear step by step. Based on experimental results, a new method may be proposed to rank the coated materials with strong inter-facial adhesion. (C) 2008 Elsevier B.V. All rights reserved.