Evolution of alumina phase structure in thermal plasma processing

• DOI: 10.1016/j.ceramint.2023.03.263
• Publication Date: 2023-03-30T08:41:24Z
• Authors: Kimmo Kaunisto; Juha Lagerbom; Mari Honkanen; Tommi Varis; Aloshious Lambai; Gaurav Mohanty; Erkki Levänen; Päivi Kivikytö-Re...; Erkka Frankberg
• Keywords: Plasma Processing

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