Figure 2
From: The thermal stability of Eyjafjallajökull ash versus turbine ingestion test sands
Photos of the samples (a) after 60 min at 700°C (no observable change), (b) after 60 min at 900°C, (c) after 60 min at 1100°C and (d) after 60 min at 1200°C (each crucible has a diameter of 22 mm). Arrangement of samples in (a) through (c): top row from left to right: EYJA, ATD and MIL (all ϕ < 63 μm); bottom row from left to right: EYJA, ATD and MIL (all 90 < ϕ < 125 μm). Arrangement of samples in (d): top row from left to right: ATD and MIL (all ϕ < 63 μm); bottom row from left to right: ATD and MIL (all 90 < ϕ < 125 μm). After 60 minutes at 700°C (a), all samples are still loose powders. After 60 minutes at 900°C (b), EYJA samples show signs of sintering (crusted surface), all other samples are still loose powders. After 60 minutes at 1100°C (c), EYJA samples are completely sintered whereas all other samples are still loose. After 60 minutes at 1200°C (d), ATD is partially sintered (90 < ϕ < 125 μm) and completely welded (ϕ < 63 μm), respectively, whereas MIL samples are still loose powders.