Properties of Al2O3 coatings by High Velocity Suspension Flame Spraying (HVSFS): Effects of injection systems and torch design

Detailed analyses of both coatings and single splats also reveal that extremely fast quenching of very small molten droplets caused the formation of ≈ 20 wt.% glassy Al2O3. Glass transition at 527 °C and three crystallisation reactions at about 800, 1000 and 1180 °C were revealed by differential thermal analysis (DTA).