Microstructure of Atmospheric Plasma Sprayed (Al,Cr)2O3-TiO2 Coatings from Blends

2021 ◽  
Author(s):  
Maximilian Grimm ◽  
Rico Drehmann ◽  
Thomas Lampke ◽  
Susan Conze ◽  
Lutz-Michael Berger
Keyword(s):  
Solid Solution ◽  
Plasma Spraying ◽  
Chromium Content ◽  
Defect Density ◽  
Deposition Efficiency ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Tio2 Content ◽  
Tio2 Coatings ◽  
Plasma Sprayed

Abstract This study investigates the microstructure and hardness of coatings produced by atmospheric plasma spraying using a commercial (Al,Cr)2O3 solid solution (ss) powder blended with various amounts of TiO2. The microstructures were analyzed using SEM, EDS, and XRD measurements. It was shown that blending with TiO2 reduces porosity and defect density while increasing deposition efficiency and microhardness. Small amounts of Ti in ss (Al,Cr)2O3 splats were detected in coatings prepared from blends with higher TiO2 content. Variations in aluminum and chromium content were also observed.

Effects of La2O3 on the microstructure and tribological properties of plasma-sprayed Cr2O3–TiO2 coatings

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744033 ◽  
Author(s):  
Qingjun Ding ◽  
Aihua Zhang ◽  
Gai Zhao ◽  
Hanmin Peng ◽  
Wei Gao
Keyword(s):  
Solid Solution ◽  
Surface Roughness ◽  
Tribological Properties ◽  
Adhesive Wear ◽  
Microscopic Analysis ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Properties Of Coatings ◽  
Hardness Tester ◽  
Plasma Sprayed

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.

Influence of atmospheric plasma spraying on the solar photoelectro-catalytic properties of TiO2 coatings

2016 ◽  
Vol 189 ◽  
pp. 151-159 ◽  
Author(s):  
Sergi Dosta ◽  
Marco Robotti ◽  
Sergi Garcia-Segura ◽  
Enric Brillas ◽  
Irene Garcia Cano ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Catalytic Properties ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Tio2 Coatings

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.

Fast Regime-Fluidized Bed Machining (FR-FBM) of Atmospheric Plasma Spraying (APS) TiO2 coatings

2008 ◽  
Vol 203 (5-7) ◽  
pp. 855-861 ◽  
Author(s):  
Massimiliano Barletta ◽  
Gianluca Rubino ◽  
Stefano Guarino ◽  
Giovanni Bolelli ◽  
Luca Lusvarghi ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Tio2 Coatings

Structure and photocatalytic activity of TiO2 coatings deposited by atmospheric plasma spraying

2011 ◽  
Vol 205 ◽  
pp. S229-S231 ◽  
Author(s):  
Maryamossadat Bozorgtabar ◽  
Mohammadreza Rahimipour ◽  
Mehdi Salehi ◽  
Mohammadreza Jafarpour
Keyword(s):  
Photocatalytic Activity ◽  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Tio2 Coatings

Comparison of Dry Sliding Tribological Behavior of Nanostructured Al2O3–13 wt% TiO2 Coatings Prepared by High-Efficiency Supersonic Plasma Spraying and Atmospheric Plasma Spraying

2020 ◽  
Vol 143 (7) ◽  
Author(s):  
Zi-ang Jin ◽  
Jian-long Ma ◽  
Li-na Zhu ◽  
Hai-dou Wang ◽  
Guo-lu Li ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Friction And Wear ◽  
High Efficiency ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Wear Volume ◽  
Dry Sliding ◽  
Wear Protection ◽  
Supersonic Plasma ◽  
Tio2 Coatings

Abstract Plasma-sprayed ceramic coatings have been widely used in friction and wear protection of mechanical parts. In this paper, the nanostructured Al2O3–13 wt% TiO2 coatings were prepared by high-efficiency supersonic plasma spraying (HESP) and atmospheric plasma spraying (APS), respectively. The surface and section morphology of the coatings were observed by scanning electron microscopy (SEM). The phase composition of the coatings was analyzed by X-ray diffraction (XRD). The dry sliding friction properties of the coatings were tested on UMT-3 friction and wear testing machine. The results show that after plasma spraying, a large amount of γ-Al2O3 phase appears, while the TiO2 phase almost disappears in the coatings; compared with APS, the coatings sprayed by HESP have fewer defects and better coating quality; under dry friction condition, the steady-state friction coefficient of the coatings sprayed by HESP and APS all decreases with the increase of load, and the wear volume all increases with the increase of load. When the load is more than 40 N, wear volume of the coatings sprayed by APS is basically twice that of HESP; the wear mechanism of the coatings sprayed by HESP is the laminar cracking, peeling off and the adhesive wear.

scholarly journals Effect of Particle In-Flight Behavior on the Microstructure and Fracture Toughness of YSZ TBCs Prepared by Plasma Spraying

Coatings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 309 ◽  
Author(s):  
Yanqiu Xiao ◽  
Erzhou Ren ◽  
Mingyang Hu ◽  
Kun Liu
Keyword(s):  
Fracture Toughness ◽  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Flight Behavior ◽  
Structural Defects ◽  
Yttria Partially Stabilized Zirconia ◽  
Higher Temperature ◽  
Plasma Sprayed ◽  
Unmelted Particles

The present study aims to elaborate particle in-flight behavior during plasma spraying and its significance in determining the microstructure and mechanical properties of plasma sprayed yttria partially stabilized zirconia (YSZ) thermal barrier coatings (TBCs). The as-sprayed YSZ coatings were characterized in terms of defects (such as pores, unmelted particles and cracks) and fracture toughness. The results showed that, due to the higher temperature and velocity of in-flight particles in a supersonic atmospheric plasma spraying (SAPS) compared to that of atmospheric plasma spraying (APS), denser coatings were formed leading to a better fracture toughness. The percentage of defects of the microstructure was similar to the temperature and velocity of particles in-flight during plasma spraying. Furthermore, the structural defects had a strong effect on its mechanical behavior. The total defect percentage and fracture toughness in SAPS-TBCs spanned 6.9 ± 0.17%–13.26 ± 0.22% and 2.52 ± 0.06 MPa m1/2–1.78 ± 0.19 MPa m1/2; and 11.11 ± 0.36%–17.15 ± 0.67% and 2.13 ± 0.08 MPa m1/2–1.4 ± 0.12 MPa m1/2 in APS-TBCs.

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