scholarly journals The Microstructure and Selected Mechanical Properties of Al2O3 + 13 wt % TiO2 Plasma Sprayed Coatings

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 173 ◽  
Author(s):  
Monika Michalak ◽  
Leszek Łatka ◽  
Paweł Sokołowski ◽  
Aneta Niemiec ◽  
Andrzej Ambroziak
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Phase Composition ◽  
Atmospheric Plasma ◽  
Dry Sliding Wear ◽  
Coating Morphology ◽  
Coating Microstructure ◽  
Tio2 Coatings ◽  
Feedstock Preparation ◽  
Plasma Sprayed

The Al2O3 + TiO2 coatings are of the interest of surface technology and tribology due to their good wear resistance and enhanced toughness comparing to pure Al2O3 coatings. However, the detailed effect of the used feedstock powder, is often neglected. Here, this work focuses on the deposition of Al2O3 + 13 wt % TiO2 coatings by atmospheric plasma spraying (APS) method as well as on their microstructure, phase composition and selected mechanical properties, in the reference to the route of the powder feedstock preparation. The commercial powder Metco 6221 in agglomerated and sintered form was used as a feedstock material during spraying, due to the fact that, so far, sintered or cladded powders are the most studied ones. The 2k + 1 spray experiment allowed to evaluate the influence of two variables, namely spray distance and torch linear velocity, on the coating microstructure. Afterwards, the coating adhesion was measured by the means of pull-off test. The correlations between Vickers microhardness, fracture toughness (Kc) as well as the coating morphology and phase composition were investigated. Finally, the dry sliding wear resistance was studied by using Ball-on-Disc method.

Mechanical and Tribological Properties of W(100-x)%Cx% Coatings Deposited by DC Magnetron Sputtering

2015 ◽  
Vol 642 ◽  
pp. 184-189
Author(s):  
Yan Liang Su ◽  
Yueh Feng Lin
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Magnetron Sputtering ◽  
X Ray Diffraction ◽  
Mechanical And Tribological Properties ◽  
Unbalanced Magnetron Sputtering ◽  
Unbalanced Magnetron ◽  
Pin On Disc ◽  
Dry Conditions ◽  
Coating Microstructure

W(100-x)%Cx% coatings with different tungsten and carbon contents were deposited by unbalanced magnetron sputtering. The microstructures and mechanical properties of the W(100-x)%C x% coatings was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), nanoindentation and adhesion testing techniques. The tribological performance of the coatings was investigated using a pin-on-disc trobometer under dry conditions. Experimental results indicated that coating microstructure, mechanical properties and wear resistance varied according to the tungsten and carbon contents of the coatings. The W72%C28% coating had the highest hardness/elastic modulus (H/E) ratio. In the ball-on-disc wear tests, it was found that the W72%C28% coating exhibited the best wear resistance.

Mechanical properties of plasma sprayed nanostructured TiO2 coatings on mild steel

2014 ◽  
Vol 40 (5) ◽  
pp. 7049-7056 ◽  
Author(s):  
S.M. Forghani ◽  
M.J. Ghazali ◽  
A. Muchtar ◽  
A.R. Daud
Keyword(s):  
Mechanical Properties ◽  
Mild Steel ◽  
Nanostructured Tio2 ◽  
Tio2 Coatings ◽  
Plasma Sprayed

scholarly journals A Study on the Microstructural Characterization and Phase Compositions of Thermally Sprayed Al2O3-TiO2 Coatings Obtained from Powders and Water-Based Suspensions

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2638 ◽  
Author(s):  
Monika Michalak ◽  
Filofteia-Laura Toma ◽  
Leszek Latka ◽  
Pawel Sokolowski ◽  
Maria Barbosa ◽  
...  
Keyword(s):  
Phase Composition ◽  
Plasma Spraying ◽  
Microstructural Characterization ◽  
Atmospheric Plasma ◽  
Coating Morphology ◽  
Liquid Feedstock ◽  
Α Al2o3 ◽  
Titania Coatings ◽  
Thermal Spray Processes ◽  
Oxygen Fuel

In this work, the alumina (Al2O3) and alumina-titania coatings with different contents of TiO2, i.e., Al2O3 + 13 wt.% TiO2 and Al2O3 + 40 wt.% TiO2, were studied. The coatings were produced by means of powder and liquid feedstock thermal spray processes, namely atmospheric plasma spraying (APS), suspension plasma spraying (SPS) and suspension high-velocity oxygen fuel spraying (S-HVOF). The aim of the study was to investigate the influence of spray feedstocks characteristics and spray processes on the coating morphology, microstructure and phase composition. The results revealed that the microstructural features were clearly related both to the spray processes and chemical composition of feedstocks. In terms of phase composition, in Al2O3 (AT0) and Al2O3 + 13 wt.% TiO2 (AT13) coatings, the decrease in α-Al2O3, which partially transformed into γ-Al2O3, was the dominant change. The increased content of TiO2 to 40 wt.% (AT40) involved also an increase in phases related to the binary system Al2O3-TiO2 (Al2TiO5 and Al2−xTi1+xO5). The obtained results confirmed that desired α-Al2O3 or α-Al2O3, together with rutile-TiO2 phases, may be preserved more easily in alumina-titania coatings sprayed by liquid feedstocks.

scholarly journals Investigations of microstructure and selected mechanical properties of Al2O3 + 40 wt.% TiO2 coatings deposited by Atmospheric Plasma Spraying (APS)

2019 ◽  
Vol 91 (8) ◽  
pp. 7-11 ◽  
Author(s):  
Monika Michalak ◽  
Leszek Łatka ◽  
Paweł Sokołowski ◽  
Andrzej Ambroziak
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Good Adhesion ◽  
Spraying Parameters ◽  
Tio2 Coatings

Atmospheric Plasma Spraying (APS) enables deposition of coatings from different materials, including those based on Al2O3 and TiO2. In this work, Al2O3 + 40 wt.% TiO2 coatings were tested. The relationships between mechanical properties, microstructure and spraying parameters (namely: spraying distance and torch scan velocity) were investigated. Commercial -45 + 5 μm powders in agglomerated as- produced state were sprayed onto the stainless steel 1.4301 substrates. The aim of the study was to determine the adhesion, microhardness and roughness of coatings but also to characterize their microstructure. It was observed that coatings sprayed from shorter distance were well melted and revealed good adhesion, but at the same time they were more porous and of lower microhardness than those deposited from the longer spraying distance.

scholarly journals The microstructure and selected mechanical properties of Al2O3 + 3 wt.% TiO2 plasma sprayed coatings

2019 ◽  
Vol 91 (6) ◽  
pp. 39-45 ◽  
Author(s):  
Monika Michalak ◽  
Leszek Łatka ◽  
Paweł Sokołowski
Keyword(s):  
Surface Engineering ◽  
High Hardness ◽  
Atmospheric Plasma ◽  
Spray Distance ◽  
Lower Porosity ◽  
Plasma Sprayed Coatings ◽  
Tio2 Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings ◽  
Pure Al2o3

The Al2O3+TiO2 coatings are of the interest of surface engineering due to their high hardness and wear resistance but also increased toughness, when compared to pure Al2O3 ones. This article describes the deposition of Al2O3+3 wt.% TiO2 coatings by Atmospheric Plasma Spraying (APS) technique. The commercial AMI 6300.1 powder (-45 + 22 μm) was used as a feedstock. The 2k+1 spraying experiment, based on two variables, namely spray distance and torch velocity, was designed. The samples were characterized in the terms of morphology, microstructure, microhardness and roughness. It was observed that the shorter spray distance resulted in lower porosity, higher microhardness and lower roughness of coatings.

scholarly journals Mechanical Properties and Sliding Wear Resistance of Suspension Plasma Sprayed YSZ Coatings

2020 ◽  
Vol 14 (4) ◽  
pp. 307-314
Author(s):  
Leszek Łatka ◽  
Mirosław Szala ◽  
Wojciech Macek ◽  
Ricardo Branco
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Sliding Wear ◽  
Plasma Sprayed

Research on Laser Remelting of Plasma Sprayed Ceramic Nanometer Coatings on the Inner Wall of the Cylinder Liner

2014 ◽  
Vol 912-914 ◽  
pp. 301-304
Author(s):  
Jun Yuan Mao ◽  
Wei Gang Zheng
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Composite Ceramic ◽  
Working Environment ◽  
Laser Remelting ◽  
Pressure Shock ◽  
Coating Technology ◽  
Plasma Sprayed

The Cylinder liner is one of the working environment of the worst parts in internal combustion engine ,it is required to have good wear resistance, corrosion resistance, resistance to high temperature and high pressure shock, etc. After tests showed, better comprehensive mechanical properties of cylinder liner is got by using Plasma Spray composite ceramic nanometer coating technology, and after laser remelting treatment.

Tribological behavior of CrN coating on aluminum alloys deposited by arc ion plating

2002 ◽  
Vol 17 (12) ◽  
pp. 3133-3138 ◽  
Author(s):  
Fei Zhou ◽  
Chang-Min Suh ◽  
Seock-Sam Kim ◽  
Ri-Ichi Murakami
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Normal Load ◽  
Dry Sliding Wear ◽  
Wear Volume ◽  
Arc Ion Plating ◽  
Crn Coating ◽  
Ion Plating ◽  
Wear And Friction

Dry sliding wear and friction tests of CrN coating on two types of aluminum alloy substrates, 6061 Al and 7075 Al, deposited by arc ion plating were performed with a ball-on-disk tribometer. The effects of normal load and the mechanical properties of the substrate on the friction coefficient and wear resistance of CrN coating were investigated. The worn surfaces were observed by scanning electron microscopy. The results show that surface microhardness of CrN-coated 7075 Al is higher than that of CrN-coated 6061 Al. With an increase in normal load, wear volume increases, while the friction coefficient decreases. The friction coefficient of CrN-coated 6061 Al is higher than that of CrN-coated 7075 Al, while the wear resistance of CrN-coated 6061 Al is lower than that of the CrN-coated 7075 Al. This indicates that the substrate mechanical properties have strong influence on the friction coefficient and wear of CrN coating. The main wear mechanism was fragments of CrN coating, caused by apparent plastic deformation of substrate during wear tests.

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