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Cavitation wear characteristics of Al2O3-ZrO2-ceramic coatings deposited by APS and HVOF -processes

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Details

Original languageEnglish
Title of host publicationInternationl Thermal Spray Conference ITSC 2017, Conference Proceedings
Subtitle of host publication June 7-9, 2017, Düsseldorf, Germany.
Place of PublicationDüsseldorf
PublisherDVS Media GmbH
Pages928-933
Number of pages6
Volume336
ISBN (Electronic)978-3-96144-000-9
Publication statusPublished - 9 Jun 2017
Publication typeB3 Non-refereed article in conference proceedings
EventInternational Thermal Spray Conference -
Duration: 1 Jan 1900 → …

Publication series

NameDVS-Berichte / DVS - Deutscher Verband für Schweißen und Verwandte Verfahren e.V.
PublisherDVS Media GmbH
ISSN (Electronic)0418-9639

Conference

ConferenceInternational Thermal Spray Conference
Period1/01/00 → …

Abstract

Thermally sprayed ceramic coatings are used in environments requiring good wear- and corrosion resistance among others. However, a typical issue with ceramic coatings is their low impact resistance and tendency to fail catastrophically by cracking. In bulk ceramics, the Al2O3-ZrO2–composition has been of interest for long since already small additions of ZrO2 into Al2O3 have shown improvements in fracture toughness compared to pure Al2O3. Efforts are being made to induce this increased resistance to fracturing in thermally sprayed coatings as well, resulting in higher wear resistance due to a more predictable behavior and damage-tolerance. In this work, Al2O3-ZrO2-coatings have been deposited by atmospheric plasma spray (APS) and high-velocity oxy-fuel spray (HVOF) processes. The wear characteristics of the coatings were evaluated with cavitation erosion, delving into the mechanics of the erosion and the resulting microstructural changes in the coatings. Evidence of phase transformation of t-ZrO2 to m-ZrO2 was found during the erosion. The HVOF-sprayed coating exhibited greater wear resistance against the cavitating bubbles due to its finer microstructure.

Keywords

  • Thermal spray coating, HVOF spraying, Cavitation damage, alumina-yttria-stabilized zirconia, Erosion testing, PLASMA SPRAY

Publication forum classification

Field of science, Statistics Finland