Effect of microstructural characteristics on thermal and electrical properties of thermally sprayed ceramic coatings

F. Azarmi, E. Mironov, I. Shakhova, A. Safonov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

Thermal and electrical properties of alumina (Al2O3) coating produced via atmospheric plasma spraying (APS) was investigated in this research work. Formation of layered microstructure, which contains splats and pores, was experimentally observed. Splats as building blocks of the coating had average transverse size of about 3±0.5 pm. X-ray diffraction revealed that feedstock powder contained pure α-Al2O3, while deposited alumina coating was a mixture of α-Al2O3 and γ-Al2O3 phases. The measured hardness of the coating was 783±55 Hv, which was reasonably high despite the porosity level of 10±2 %. The electrical properties were measured using the pseudo two-contact impedance spectroscopy method that allowed separating the electrical resistivity of splats and their boundaries within coating microstructure. The obtained results showed significant difference between these two types of elements with the resistivity of splats being 5 times smaller than that of the splat boundaries. Finally, the measurements of thermal conductivity gave value of 3.3±0.8 W/m·K, which indicated a good agreement between experimental, analytical and numerical models.

Original languageEnglish
Title of host publicationCeramic Engineering and Science Proceedings
EditorsJonathan Salem, Jerry C. LaSalvia, Roger Narayan, Dongming Zhu
PublisherAmerican Ceramic Society
Pages115-124
Number of pages10
Edition2
ISBN (Print)9781119040439
DOIs
Publication statusPublished - 2018
Event41st International Conference on Advanced Ceramics and Composites, ICACC 2017 - Daytona Beach, United States
Duration: 22 Jan 201727 Jan 2017

Publication series

NameCeramic Engineering and Science Proceedings
Number2
Volume38
ISSN (Print)0196-6219

Conference

Conference41st International Conference on Advanced Ceramics and Composites, ICACC 2017
Country/TerritoryUnited States
CityDaytona Beach
Period22/01/1727/01/17

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