A COMPARISON OF TRIBOLOGICAL PERFORMANCES OF Al2O3 AND Al2O3 + 40 wt .% TiO2 COATINGS MANUFACTURED BY ATMOSPHERIC PLASMA SPRAYING

Tribologia ◽  
2019 ◽  
Vol 286 (4) ◽  
pp. 63-71
Author(s):  
Aneta NIEMIEC ◽  
Monika MICHALAK ◽  
Leszek ŁATKA ◽  
Paweł SOKOŁOWSKI
Keyword(s):  
Fracture Toughness ◽  
Plasma Spraying ◽  
Dry Friction ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Al2o3 Coating ◽  
Average Grain Size ◽  
Tio2 Coatings ◽  
Scanning Electron ◽  
Ball On Disc

In this paper, the results of tribological, microscopic and mechanical research of Al2O3 and Al2O3 + 40 wt.% TiO2 coatings manufactured by atmospheric plasma spraying (APS) were presented. The feedstock materials were Al2O3 (Metco 6103, Oerlikon Metco) and Al2O3 + 40 wt.% TiO2 (Metco 131VF, Oerlikon Metco) powders with the average grain size of 30 μm. The stainless steel (X5CrNi18-10) coupons had a diameter equal to 25 mm and 2 mm of thickness. The morphology and microstructure of obtained coatings were tested by scanning electron microscope (SEM). Then adhesion tests and tribological examinations by ball-on-disc (BoD) mode in technical dry friction conditions were carried out. During BoD testing, the load of 5 N was used. It was concluded that the Al2O3 coating was characterized by higher wear resistance and microhardness, but, at the same time, it was of lower fracture toughness than the Al2O3 + 40 wt.% TiO2 coating.

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

TRIBOLOGICAL PROPERTIES OF Al2O3 + TiO2 COATINGS MANUFACTURED BY PLASMA SPRAYING

Tribologia ◽  
2019 ◽  
Vol 283 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Leszek ŁATKA ◽  
Aneta NIEMIEC ◽  
Monika MICHALAK ◽  
Paweł SOKOŁOWSKI
Keyword(s):  
Plasma Spraying ◽  
Dry Friction ◽  
Plasma Torch ◽  
Spray Parameters ◽  
Good Adhesion ◽  
Spray Distance ◽  
Compact Structure ◽  
Tio2 Coatings ◽  
Made In ◽  
Ball On Disc

In the paper the results of tribological, microscopic, and mechanical research of Al2O3 + TiO2 coatings manufactured by plasma spraying are presented. The feeding material was a powder Al2O3 + 13 wt.% TiO2 (Metco 6221, OerlikonMetco) with grain size – 45 ± 15 μm. The cylinder substrates made from stainless steel (X5CrNi18-10) had a diameter equal to 25 mm and 2 mm of thickness. The variable spray parameters were plasma torch velocity in terms of substrate and spray distance. The morphology of obtained coatings was tested by scanning electron microscope (SEM), and the microstructure was investigated by light optical microscopy (LOM) and SEM. The results of mechanical properties examinations revealed the dependence of the microhardness and fracture toughness on the spray parameters. Tribological examinations were made in the ball-on-disc mode in technical dry friction conditions. Two loads were used, 5 N and 10 N. Based on the carried out tests, it could be concluded that a shorter spray distance and a reduction of the torch velocity allows one to achieve a more compact structure, which is characterized by good adhesion at the coating-substrate interface (in range from 11 to 14 MPa) and good wear resistance.

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

scholarly journals Thermal Shock Behavior and Particle Erosion Resistance of Toughened GZ Coatings Prepared by Atmospheric Plasma Spraying

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1477
Author(s):  
Zining Yang ◽  
Weize Wang ◽  
Shujuan Deng ◽  
Huanjie Fang ◽  
Ting Yang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Thermal Shock ◽  
Plasma Spraying ◽  
Erosion Resistance ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Thermal Shock Test ◽  
Particle Erosion ◽  
Shock Test ◽  
Gadolinium Zirconate

Gadolinium zirconate with excellent high-temperature phase stability and sintering resistance has become a very promising candidate material for a new generation of thermal barrier coatings (TBCs). However, the low fracture toughness of gadolinium zirconate greatly limits its application. In this study, gadolinium zirconate (GZ) and two kinds of toughened gadolinium zirconate (GZ/YSZ prepared by mixed powder of Gd2Zr2O7 and YSZ and GSZC prepared by (Gd0.925Sc0.075)2(Zr0.7Ce0.3)2O7 powder) double-layered TBCs were prepared by atmospheric plasma spraying (APS). The fracture toughness of the GZ/YSZ coating and GSZC coating were 9 times and 3.5 times that of GZ coating, respectively. The results of thermal shock test showed that the three TBCs exhibit different failure mechanisms. During the thermal shock test, cracking occurred at the interfaces between the YSZ layer and the BC or GZ/YSZ layer, while GSZC TBC failed due to premature cracking inside the GSZC layer. The particle erosion rate of the GZ, GZ/YSZ, and GZSC coatings were 1.81, 0.48, and 1.01 mg/g, respectively, indicating that the erosion resistance of coatings is related to their fracture toughness. Furthermore, the superior erosion resistance of the GZ/YSZ and GSZC coatings can be attributed to the conversion of crack propagation path during the erosion test.

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.

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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