Improvement of the tribological properties of alumina coatings by zirconia addition

Mathew, Jacob Shiby (author), Marcinauskas, Liutauras (author), Kalin, Mitjan (author), Keželis, Romualdas (author), Kavaliauskas, Žydrunas (author), Gecevičius, Giedrius (author), Čapas, Vytautas (author)

Al$_2$O$_3$ and Al$_2$O$_3$-ZrO$_2$ coatings were deposited on stainless steel using atmospheric plasma spraying. The influence of arc current and zirconia addition on the surface morphology of the coating, phase composition and tribological properties under dry sliding conditions were investigated. The addition of zirconia reduced the surface roughness of the coatings. The X-ray diffraction measurements indicated that the Al$_2$O$_3$ coatings were composed of β-Al$_2$O$_3$, α-Al$_2$O$_3$, and γ-Al$_2$O$_3$ phases. The addition of zirconia led to the formation of tetragonal and monoclinic phases of zirconia in the as-sprayed coatings. The friction coefficients of Al$_2$O$_3$ and Al$_2$O$_3$-ZrO$_2$ coatings were similar and varied in the range of 0.72–0.75. The specific wear rates of the as-sprayed coatings were reduced with the increase of arc current. It was obtained that the wear rates of the Al$_2$O$_3$-ZrO$_2$ coatings were at least three times lower compared to Al$_2$O$_3$ coatings.

• Language: English
• Keywords: tribology, plasma spraying, air-hydrogen plasma, alumina-zirconia, friction coefficient
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 14 str.
• Numbering: Vol. 11, iss. 8, art. 991
• PID: 20.500.12556/RUL-136173
• UDC: 539.92
• ISSN on article: 2079-6412
• DOI: 10.3390/coatings11080991
• COBISS.SI-ID: 73681923
• Publication date in RUL: 14.04.2022

Record is a part of a journal

• Title: Coatings
• Shortened title: Coatings
• Publisher: MDPI AG
• ISSN: 2079-6412
• COBISS.SI-ID: 523035673

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 20.08.2021

Secondary language

• Language: Slovenian
• Keywords: tribologija, napraševanje s plazmo, zrak-vodikova plazma, cirkonijev dioksid, koeficient trenja