Figure 3
From: The thermal stability of Eyjafjallajökull ash versus turbine ingestion test sands
SEM images of impregnated thin section showing the different degrees of sintering from quasi-initial conditions after 60 minutes at 950°C (a overview, b detail), through considerable neck formation after 60 minutes at 1000°C (c overview, d detail) to complete textural densification after 60 minutes at 1050°C (e overview, f detail).