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Characterization of powder-precursor HVOF-sprayed Al2O3-ZrO2 coatings

Research output: Other conference contributionPaper, poster or abstract

Details

Original languageEnglish
StatePublished - 2018
EventInternational Thermal Spray Conference 2018, ITSC2018 - Gaylord Palms Resort & Convention Center, Orlando, United States
Duration: 7 May 201810 May 2018
https://www.asminternational.org/web/itsc-2018

Conference

ConferenceInternational Thermal Spray Conference 2018, ITSC2018
CountryUnited States
CityOrlando
Period7/05/1810/05/18
Internet address

Abstract

Enhancing mechanical and chemical properties of ceramic coatings is a perpetual objective in the thermal spraying community. Introducing either novel feedstock or thermal spray processes are the most plausible ways to achieve the improvements, such as improved corrosion resistance or damage tolerance. Properties such as quasi-plasticity and ultra-high yield strength of ceramics can be obtained by increasing the number of nanoscale features in the as-sprayed ceramic coating. Currently, thermal spraying using liquid feedstock can produce coatings with very fine microstructures either by utilizing submicron particles in the form of a suspension or through in-situ synthesis. The focus of this work was to obtain bimodal microstructure by using simultaneous powder-precursor HVOF spraying. Nanostructure was achieved from YSZ and ZrO2 solution-precursor and structure with microscale features from conventional Al2O3 spray powder. The microstructure, phase composition and cavitation erosion resistance of the coatings were compared to the conventional HVOF-sprayed Al2O3-coating.