Evaluation of the wear resistance of Al2O3 and Al2O3-Y2O3 composite coatings deposited by atmospheric plasma spraying

Document Type : Original Articles

Authors

Hossein Aghajani ¹

saied taghiramezani ²

zia valefi ²

masud mirjani ²

¹ Faculty of Materials and Manufacturing Technologies, Malek Ashtar university of Technology,Iran.

² Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Iran.

10.22067/jmme.2025.92886.1200

Abstract

In this study, microni alumina and Al2O3-20%Y2O3 composite coatings were applied by atmospheric plasma spraying. The aim of this work was to investigate the effect of adding a secondary phase of yttria on the microstructure, hardness and adhesion strength of alumina coatings. The coatings were evaluated using scanning electron microscopy, X-ray diffraction, microhardness testing and adhesion strength testing. Also, in order to investigate the wear behavior of the coatings, pin-on-disk wear test was used with forces of 2, 10 and 20 N. The results showed that the hardness of the alumina coating was 110 Vickers higher than its composite with yttrium oxide, while the adhesion strength of the Al2O3-20%Y2O3 composite coating was 4.6 MPa higher than that of the pure alumina coating, and the reason for this is the better adhesion of the splats due to the chemical bonding of yttria and alumina in the composite coatings. Also, in the composite coating, although it had a lower hardness than the single-component alumina coating, its higher toughness and better microstructure had a dominant effect and led to improved wear resistance performance against tungsten carbide abrasive. In addition, the weight loss data also showed that the composite coating had a better performance in wear resistance at all test forces.

Keywords

Alumina

Yttria secondary phase

Atmospheric Plasma Spraying

Wear resistance

Micro-hardness

Adhesion

Subjects

• Surface and Interface Metallurgy (Coating)

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