Charakterystyka mikrostruktury powłok Ni-Al2O3 natryskanych zimnym gazem

Góral, A.; Żórawski, W.

doi:10.26628/ps.v87i9.448

Cited by 3 publications

(3 citation statements)

References 6 publications

(6 reference statements)

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“…Nowadays thermal spraying of coatings is a relevant issue in the surface industry [1]. A lot of attention is paid to the complex deposits, derived from powders which are composed of different metals, hardmetals, and/or oxides [1][2][3]. One of those intensively studied powders are Al 2 O 3 + TiO 2 powders, most commonly sprayed with the Atmospheric Plasma Spraying (APS) method [1].…”

Section: Introductionmentioning

confidence: 99%

“…One of those intensively studied powders are Al 2 O 3 + TiO 2 powders, most commonly sprayed with the Atmospheric Plasma Spraying (APS) method [1]. Such powders combined from two oxides (Al 2 O 3 and TiO 2 ) have better technological properties than each of them separately [2]. The addition of TiO 2 to Al 2 O 3 results in lower melting point of the Al 2 O 3 + TiO 2 powder, and thus enables the production of less porous and more durable coatings [4].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Atmospheric Plasma Spray Parameters on Cavitation Erosion Resistance of Al₂O₃-13% TiO₂ Coatings

et al. 2019

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In this paper the results of cavitation erosion test of ceramic coatings are presented. The Al2O3-13% TiO2 coatings were manufactured by powder atmospheric plasma spraying. The plasma spray experimental parameters included two variables: (i) spray distance varying from 80 to 100 mm and (ii) torch linear speed varying from 300 to 500 mm/s.The as sprayed surface roughness was measured. The coatings structure was investigated using SEM. Porosity was investigated according to the ASTM E2109-01 Standard procedure. Additional microhardness measurements were conducted. The cavitation tests were carried out on vibratory test rig according to the ASTM G-32 standard regarding to the stainless steel (grade 304) reference sample. The cavitational worn areas were examined using SEM microscopy and roughness measurements. The influence of coatings microstructure and microhardness on the cavitation erosion resistance was investigated. The coatings microstructure was strongly dependent on spray distance as well as torch linear velocity. Decrease of the hardness was a result of less compact structure and lower degree of well molten particle. On the contrary, the best cavitation erosion resistance was characteristic for coatings which have quite good and compact structure but on the other hand the heat flux was lower. Higher heat flux caused thermal stresses, which were visible as cracks in the structure. Moreover, the type of the structure was important because from the point of view of the cavitation erosion resistance, lamellar architecture is more preferred than the columnar one. Finally, the structure type was linked to the process parameters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Atmospheric Plasma Spray Parameters on Cavitation Erosion Resistance of Al₂O₃-13% TiO₂ Coatings

et al. 2019

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“…In this group one of the most frequently used are Al2O3 and TiO2. Powders which have agglomerated and sintered morphology are very interesting from an application point of view [3,4]. Coatings based on pure alumina are used when the wear resistance and corrosion against chemical agents is required [5].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties investigations of the plasma sprayed coatings based on alumina powder

Spyra¹,

Michalak²,

Niemiec³

et al. 2020

Weld. Tech. Rev.

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In this paper Al2O3 + 13 wt% TiO2 ceramic coatings manufactured by Atmospheric Plasma Spraying (APS) have been investigated. The commercial feedstock materials, Metco 6221 (top coat) and Amdry 4535 (bond coat) have been deposited on stainless steel coupons. The main goal of researches was to determine the influence of critical plasma spray parameters (CPSP) on structure and properties of the coatings. In present studies, the electrical power was a variable parameter. Coatings have been characterized by in the terms of microstructure, topography, bond strength adhesion, fracture toughness and wear resistance. As a result, it was observed, that coatings sprayed with higher value of the electrical power exhibit higher mechanical properties due to better cohesion as well as higher melting degree.

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TRIBOLOGICAL PROPERTIES OF Al2O3 + TiO2 COATINGS MANUFACTURED BY PLASMA SPRAYING

et al. 2019

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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.

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Charakterystyka mikrostruktury powłok Ni-Al2O3 natryskanych zimnym gazem

Cited by 3 publications

References 6 publications

Impact of Atmospheric Plasma Spray Parameters on Cavitation Erosion Resistance of Al₂O₃-13% TiO₂ Coatings

Impact of Atmospheric Plasma Spray Parameters on Cavitation Erosion Resistance of Al₂O₃-13% TiO₂ Coatings

Mechanical properties investigations of the plasma sprayed coatings based on alumina powder

TRIBOLOGICAL PROPERTIES OF Al2O3 + TiO2 COATINGS MANUFACTURED BY PLASMA SPRAYING

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Charakterystyka mikrostruktury powłok Ni-Al2O3 natryskanych zimnym gazem

Cited by 3 publications

References 6 publications

Impact of Atmospheric Plasma Spray Parameters on Cavitation Erosion Resistance of Al2O3-13% TiO2 Coatings

Impact of Atmospheric Plasma Spray Parameters on Cavitation Erosion Resistance of Al2O3-13% TiO2 Coatings

Mechanical properties investigations of the plasma sprayed coatings based on alumina powder

TRIBOLOGICAL PROPERTIES OF Al2O3 + TiO2 COATINGS MANUFACTURED BY PLASMA SPRAYING

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Product

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Impact of Atmospheric Plasma Spray Parameters on Cavitation Erosion Resistance of Al₂O₃-13% TiO₂ Coatings

Impact of Atmospheric Plasma Spray Parameters on Cavitation Erosion Resistance of Al₂O₃-13% TiO₂ Coatings