Role of SiC nanoparticles on tribological properties of atmospheric plasma sprayed 5 wt% SiC–Ni60 coatings

Cr2O3–TiO2 coatings with different proportions of La2O3 were deposited by atmospheric plasma spraying. The coatings were evaluated by hardness tester, surface roughness tester, SEM and wear tester. The experiment results showed that the addition of La2O3 could improve the microhardness and decrease porosity, wear rate and surface roughness of the coating. The coating containing 2 wt.% La2O3 had the best tribological properties. The dominant wear mechanism is a mixture of abrasive wear and adhesive wear. The microscopic analysis suggests that the addition of La2O3 could refine the microstructure and promote the formation of solid solution powder, and then affect the properties of coatings.

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Effects of CeO2 on the microstructure and tribological properties of atmospheric plasma-sprayed Cr2O3-TiO2 coatings

Industrial Lubrication and Tribology ◽

10.1108/ilt-06-2019-0229 ◽

2019 ◽

Vol 72 (3) ◽

pp. 341-347 ◽

Cited By ~ 1

Author(s):

Qingjun Ding ◽

Gai Zhao

Keyword(s):

Tribological Properties ◽

Design Methodology ◽

Solution Structure ◽

Adhesive Wear ◽

Atmospheric Plasma Spraying ◽

Atmospheric Plasma ◽

Micro Hardness ◽

Properties Of Coatings ◽

Content Type ◽

Plasma Sprayed

Purpose The purpose of this paper is to study the mechanism and effect of rare earth oxides on the properties of Cr2O3-TiO2 coating. Design/methodology/approach Cr2O3-TiO2 coatings with different proportion of CeO2 were deposited by atmospheric plasma spraying on aluminum alloy 7005. The mechanical, microstructure and tribological properties were studied. Findings The addition of CeO2 could improve the micro-hardness; decrease porosity, wear rate and surface roughness of the coating; and increase the bonding strength between the coating and substrate. The wear mechanism is a mixture of abrasive and adhesive wear. Originality/value The addition of CeO2 could refine microstructure, and promote the formation of solid solution structure, and then affect the properties of coatings.

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The Role of Different Atmospheric Plasma Spray Parameters on Microstructure of Abradable AlSi-Polyester Coatings

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.270.224 ◽

2017 ◽

Vol 270 ◽

pp. 224-229

Author(s):

David Jech ◽

Ladislav Čelko ◽

Pavel Komarov ◽

Jindřich Ziegelheim ◽

Zdeněk Česánek ◽

...

Keyword(s):

Deposition Efficiency ◽

Atmospheric Plasma ◽

Spray Parameters ◽

Technological Parameters ◽

Coating Microstructure ◽

Two Parameters ◽

Plasma Sprayed ◽

Abradable Coatings ◽

And Control

One of the approaches to increase the thermic efficiency of aerospace engines is the application of abradable coatings enabling minimization and control of the clearance between the stator and the rotating blades tips. The main purpose of this contribution is to define the role of different technological parameters utilized for atmospheric plasma spraying of AlSi-polyester coating on its resulting microstructure. Deposition of abradable coatings on the real engine parts is mostly dependent on spraying stand-off distance and on spraying angle. These two parameters influence not only the coating microstructure but also the deposition efficiency itself, which is directly connected with economical aspects of the coating production. The set of experimental samples with atmospheric plasma sprayed Ni-based bond coat and two in chemical composition same initial powders delivered from different powder manufacturers were used to spray thick AlSi-polymer top coats with different spraying stand-off distances and angles. Subsequently some of the samples were also heat treated to burn-out the polymer phase from the coating microstructure. The Rockwell HR15Y hardness was measured on all samples and the microstructure and coating thickness were evaluated by means of light microscopy and image analysis methods.

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