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

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...

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Main Authors:	Monika Michalak, Leszek Łatka, Paweł Sokołowski, Aneta Niemiec, Andrzej Ambroziak
Format:	Article
Language:	English
Published:	MDPI AG 2020-02-01
Series:	Coatings
Subjects:	plasma spraying coating morphology microstructure phase composition roughness microhardness fracture toughness sliding wear resistance
Online Access:	https://www.mdpi.com/2079-6412/10/2/173

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spelling	doaj-33beaa1067784c2a942f6b1fa3cfb94d2020-11-25T02:29:53ZengMDPI AGCoatings2079-64122020-02-0110217310.3390/coatings10020173coatings10020173The Microstructure and Selected Mechanical Properties of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> Plasma Sprayed CoatingsMonika Michalak0Leszek Łatka1Paweł Sokołowski2Aneta Niemiec3Andrzej Ambroziak4Faculty of Mechanical Engineering, Wrocław University of Science and Technology, Łukasiewicza 5, 50-371 Wrocław, PolandFaculty of Mechanical Engineering, Wrocław University of Science and Technology, Łukasiewicza 5, 50-371 Wrocław, PolandFaculty of Mechanical Engineering, Wrocław University of Science and Technology, Łukasiewicza 5, 50-371 Wrocław, PolandFaculty of Mechanical Engineering, Wrocław University of Science and Technology, Łukasiewicza 5, 50-371 Wrocław, PolandFaculty of Mechanical Engineering, Wrocław University of Science and Technology, Łukasiewicza 5, 50-371 Wrocław, PolandThe Al<sub>2</sub>O<sub>3</sub> + TiO<sub>2</sub> coatings are of the interest of surface technology and tribology due to their good wear resistance and enhanced toughness comparing to pure Al<sub>2</sub>O<sub>3</sub> coatings. However, the detailed effect of the used feedstock powder, is often neglected. Here, this work focuses on the deposition of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> 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 2<i><sup>k</sup></i> + 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 (<i>Kc</i>) 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.https://www.mdpi.com/2079-6412/10/2/173plasma sprayingcoatingmorphologymicrostructurephase compositionroughnessmicrohardnessfracture toughnesssliding wear resistance
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Monika Michalak Leszek Łatka Paweł Sokołowski Aneta Niemiec Andrzej Ambroziak
spellingShingle	Monika Michalak Leszek Łatka Paweł Sokołowski Aneta Niemiec Andrzej Ambroziak The Microstructure and Selected Mechanical Properties of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> Plasma Sprayed Coatings Coatings plasma spraying coating morphology microstructure phase composition roughness microhardness fracture toughness sliding wear resistance
author_facet	Monika Michalak Leszek Łatka Paweł Sokołowski Aneta Niemiec Andrzej Ambroziak
author_sort	Monika Michalak
title	The Microstructure and Selected Mechanical Properties of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> Plasma Sprayed Coatings
title_short	The Microstructure and Selected Mechanical Properties of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> Plasma Sprayed Coatings
title_full	The Microstructure and Selected Mechanical Properties of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> Plasma Sprayed Coatings
title_fullStr	The Microstructure and Selected Mechanical Properties of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> Plasma Sprayed Coatings
title_full_unstemmed	The Microstructure and Selected Mechanical Properties of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> Plasma Sprayed Coatings
title_sort	microstructure and selected mechanical properties of al<sub>2</sub>o<sub>3</sub> + 13 wt % tio<sub>2</sub> plasma sprayed coatings
publisher	MDPI AG
series	Coatings
issn	2079-6412
publishDate	2020-02-01
description	The Al<sub>2</sub>O<sub>3</sub> + TiO<sub>2</sub> coatings are of the interest of surface technology and tribology due to their good wear resistance and enhanced toughness comparing to pure Al<sub>2</sub>O<sub>3</sub> coatings. However, the detailed effect of the used feedstock powder, is often neglected. Here, this work focuses on the deposition of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> 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 2<i><sup>k</sup></i> + 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 (<i>Kc</i>) 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.
topic	plasma spraying coating morphology microstructure phase composition roughness microhardness fracture toughness sliding wear resistance
url	https://www.mdpi.com/2079-6412/10/2/173
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The Microstructure and Selected Mechanical Properties of Al<sub>2</sub>O<sub>3</sub> + 13 wt % TiO<sub>2</sub> Plasma Sprayed Coatings

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