scholarly journals Microstructure of the coating obtained by magnetron sputtering of a Ni-Cr-B4C composite target

2021 ◽  
Vol 2124 (1) ◽  
pp. 012021
Author(s):  
S V Zaitsev ◽  
D S Prokhorenkov ◽  
M S Ageeva ◽  
A A Skiba
Keyword(s):  
Magnetron Sputtering ◽  
Composite Coating ◽  
Composite Coatings ◽  
Thermal Spraying ◽  
Rf Magnetron Sputtering ◽  
Columnar Structure ◽  
Columnar Crystal ◽  
Composite Target ◽  
Combined Use ◽  
Positive Effect

Abstract This paper presents data on obtaining a composite coating by radio frequency (RF) magnetron sputtering of a Ni-Cr-B4C composite target in an inert gas (argon) environment. To make the target, Ni-Cr-B4C composite powder was applied to the copper base of the target by detonation gas-thermal spraying. The obtained targets served as a source of coating material during high-frequency magnetron sputtering. This method of coating production ensures the reproducibility of their properties, as well as the uniformity of coating thickness and good adhesion to various target backings. The data of the study of the structure and morphology of the composite coating are presented. The resulting composite coating Ni-B/Cr7C3 with a thickness of 2 microns has a dense homogeneous structure with expressed textured polycrystallinity. The surface of the resulting coating is represented by nanoscale and homogeneous grains. There is no columnar crystal growth in the coating, which has a positive effect, as the columnar structure reduces the mechanical characteristics of the coatings due to faster oxygen diffusion along the grain boundaries. It is established that the combined use of the Ni-B and Cr7C3 binary phases in composite coatings leads to an increase in operational properties.

About Determing the Microhardness of Composite Coatings

2021 ◽  
Vol 1037 ◽  
pp. 486-493
Author(s):  
Sergey Y. Zhachkin ◽  
Anatoly I. Zavrazhnov ◽  
Nikita A. Penkov ◽  
George V. Kudryavtsev ◽  
Paul V. Tsisarenko
Keyword(s):  
Composite Coating ◽  
Mechanical Treatment ◽  
Composite Coatings ◽  
Operational Parameters ◽  
Deposition Parameters ◽  
Cylinder Liners ◽  
High Degree ◽  
Applied Coating ◽  
Positive Effect ◽  
Selection Of

One of the fundamental tasks in restoring the operability of cylinder liners is the application of a composite coating with a predetermined microhardness value. The authors have developed a technology for applying composite coatings based on iron on cylindrical surfaces, which makes it possible to vary the physical, mechanical and operational parameters of the formed iron-containing coating due to the planned selection of the deposition parameters. This eliminates the need for mechanical treatment of the applied coating, which is the reason for the high degree of rejection parts that undergo the iron-on operation. Contact interaction of the working tool with the formed layer of the composite coating has a positive effect on the value of its roughness.

Microstructure and corrosion resistance of Ni/Cr3C2-NiCr composite coating

2019 ◽  
Vol 66 (4) ◽  
pp. 471-478 ◽  
Author(s):  
Majid Hosseinzadeh ◽  
Abdol Hamid Jafari ◽  
Rouhollah Mousavi ◽  
Mojtaba Esmailzadeh
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Design Methodology ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Thermal Spraying ◽  
Content Type ◽  
Bath Solution ◽  
Electrochemical Deposition Method ◽  
Base Composite

Purpose In this study, electrochemical deposition method which have cheaper equipment than thermal spraying methods and is available for the production of composite coatings were used. Design/methodology/approach Composite coatings were electrodeposited from a Watts's bath solution in which the suspended Cr3C2-NiCr particles were dispersed in the bath solution during deposition. Potentiodynamic polarization and electrochemical impedance spectroscopy techniques have been used to evaluate the corrosion resistance of the composite coating in the 3.5 Wt.% NaCl solution. Findings It was found that the submicron Cr3C2-NiCr particles distributed uniformly in the coating and depend on the current density of deposition, different amount of particles can be incorporated in the coating. The results showed that the corrosion resistance of the Ni/ Cr3C2-NiCr composite coatings is more comparable to the pure nickel coating. Originality/value Production of Ni-base composite coating from an electrolytic bath containing Cr3C2-NiCr particles is possible via electrodeposition.

scholarly journals Ag Functionalization of Al-Doped ZnO Nanostructured Coatings on PLA Substrate for Antibacterial Applications

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1238
Author(s):  
Daniele Valerini ◽  
Loredana Tammaro ◽  
Giovanni Vigliotta ◽  
Enrica Picariello ◽  
Francesco Banfi ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Food Packaging ◽  
Wide Spectrum ◽  
Composite Coatings ◽  
Rf Magnetron Sputtering ◽  
Nanostructured Coatings ◽  
Nanostructured Composite ◽  
Growth Modes ◽  
Dual Action ◽  
Human Infections

Developing smart, environmentally friendly, and effective antibacterial surfaces is fundamental to contrast the diffusion of human infections and diseases for applications in the biomedical and food packaging sectors. To this purpose, here we combine aluminum-doped zinc oxide (AZO) and Ag to grow nanostructured composite coatings on bioplastic polylactide (PLA) substrates. The AZO layers are grown by RF magnetron sputtering, and then functionalized with Ag in atomic form by RF magnetron sputtering and in form of nanoparticles by supersonic cluster beam deposition. We compare the morphology, wettability, and antimicrobial performance of the nanostructured coatings obtained by the two methods. The different growth modes in the two techniques used for Ag functionalization are found to produce some differences in the surface morphology, which, however, do not induce significant differences in the wettability and antimicrobial response of the coatings. The antibacterial activity is investigated against Escherichia coli and Staphylococcus aureus as representatives of Gram-negative and Gram-positive bacteria, respectively. A preferential antimicrobial action of Ag on the first species and of AZO on the second one is evidenced. Through their combination, we obtain a hybrid composite coating taking advantage of the synergistic dual action of the two materials deposited, with a total bacterial suppression within few minutes for the first species and few hours for the second one, thus representing a valuable solution as a wide-spectrum bactericidal device.

Structure and Piezoelectric Properties of Aluminum Nitride Thin Films on Quartz Substrates Deposited by Reactive RF-Magnetron Sputtering

2013 ◽  
Vol 699 ◽  
pp. 308-313 ◽  
Author(s):  
Amorn Thedsakhulwong ◽  
Kitsakorn Locharoenrat ◽  
Warawoot Thowladda
Keyword(s):  
Aluminum Nitride ◽  
Magnetron Sputtering ◽  
Nitrogen Concentration ◽  
Rf Magnetron Sputtering ◽  
Columnar Structure ◽  
Absorption Bands ◽  
Cross Sectional ◽  
Sem Image ◽  
Metal Insulator Metal ◽  
Columnar Grains

This paper presents the effect of nitrogen concentration (CN) on aluminum-nitride bonding formation, structure and morphology of the aluminum nitride films. The films on the unheated substrates were deposited by radio frequency reactive magnetron sputtering technology using an aluminum target under argon/nitrogen mixture atmosphere. The FTIR and Raman spectra of the films confirmed their absorption bands corresponding to E1(TO), A1(TO), and E2(high) vibration modes of the infrared active aluminum-nitride bonding. The crystallographic orientation of the films was optimized under CNof 40%. The cross-sectional FE-SEM image of the film under this condition showed the columnar structure. The dense columnar grains were uniformly observed on the films surface under all CN, except for CNof 20%. The bulk resistivity and piezoelectric property were investigated via the metal-insulator-metal structures. The results showed that the resistivity was in a range of 1014-1015Ωcm while the effective piezoelectric coefficient was 11.03 pm/V.

Synthesis and Properties of Nanocrystalline Copper Indium Oxide Thin Films Deposited by Rf Magnetron Sputtering

2008 ◽  
Vol 8 (8) ◽  
pp. 3889-3894 ◽  
Author(s):  
Mandeep Singh ◽  
V. N. Singh ◽  
B. R. Mehta
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Indium Oxide ◽  
Photoelectron Spectroscopy ◽  
Rf Magnetron Sputtering ◽  
Composite Target ◽  
Nanocrystalline Copper ◽  
X Ray ◽  
Copper Indium ◽  
Direct Band

Nanocrystalline copper indium oxide (CuInO2) thin films with particle size ranging from 25 nm to 71nm have been synthesized from a composite target using reactive Rf magnetron sputtering technique. X-ray photoelectron spectroscopy (XPS) combined with glancing angle X-ray diffraction (GAXRD) analysis confirmed the presence of delafossite CuInO2 phase in these films. The optical absorption studies show the presence of two direct band gaps at 3.3 and 4.3 eV, respectively. The resistance versus temperature measurements show thermally activated hopping with activation energy of 0.84 eV to be the conduction mechanism.

A STUDY ON ELECTROLUMINESCENCE FROM Au/Ge-CONTAINING SILICON OXIDE/p-Si AND Au/Si-RICH SILICON OXIDE/p-Si STRUCTURES

2001 ◽  
Vol 08 (05) ◽  
pp. 483-486
Author(s):  
S. Y. MA ◽  
Y. P. GUO ◽  
Y. Y. WANG ◽  
X. Q. LIU
Keyword(s):  
Magnetron Sputtering ◽  
Silicon Oxide ◽  
Rf Magnetron Sputtering ◽  
Composite Target

Ge-containing silicon oxide (GSO) films (5–15 nm) and Si-rich silicon oxide (SSO) films (5–15 nm) were deposited using the RF magnetron sputtering technique with a Ge–SiO 2 and a Si–SiO 2 composite target, respectively. The Au/GSO/p-Si and Au/SSO/p-Si structures were fabricated and their electroluminescence (EL) characteristics were comparatively studied. Both of the Au/GSO/p-Si and Au/SSO/p-Si structures have rectifying behavior. All the EL spectra from the two types of the structure have almost unchanged peak positions around 650 nm (~1.9 eV) and are independent of applied forward biases. The EL mechanisms for the Au/GSO/p-Si and Au/SSO/p-Si structures have been discussed.

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