Evolution of alumina phase structure in thermal plasma processing

Kimmo Kaunisto (Corresponding Author), Juha Lagerbom, Mari Honkanen, Tommi Varis, Aloshious Lambai, Gaurav Mohanty, Erkki Levänen, Päivi Kivikytö-Reponen, Erkka Frankberg

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
133 Downloads (Pure)


Alumina (Al2O3) remains one the most important engineering ceramic for industrial applications. In addition to the α phase, transition alumina phases have interesting characteristics. Controlling the obtained phase structure from alumina melt requires processes with extreme cooling rates and therefore limits the tailoring capabilities. This study investigates how the cooling rate of pure alumina affects its microstructural properties and phase structure in plasma-based processing. The paper reports phase changes in micron sized granulated alumina particles in high-temperature plasma spheroidization and compares the results to plasma sprayed alumina coatings. Both plasma processes involve melting of the material followed by subsequent rapid cooling. Direct comparison on the alumina phase transitions is obtained for the two methodically distinct processing routes, creating unique microstructures due to difference in their cooling rates.

Original languageEnglish
Pages (from-to)21346-21354
Number of pages9
JournalCeramics International
Issue number13
Publication statusPublished - 1 Jul 2023
MoE publication typeA1 Journal article-refereed


This work was supported by Academy of Finland -project “PlaCeEra – Plastic deformation mechanisms in ceramic materials“, grant numbers 315451, 326426, 315452. The EBSD work made use of Tampere Microscopy Center facilities at Tampere University.


  • AlO (D)
  • Electron microscopy (B)
  • Powders: solid state reaction (A)
  • Transition phases
  • X-ray methods (B)


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