Single particle impact tests on blo

Single particle impact tests on block specimens (45 mm× 45 mm× 100 mm) in high temperature corrosive environments were conducted with a compact gas gun schematically shown in Fig. 2. Glass beads with 2, 3 and 5 mm in diameter were impacted on the specimens with corrosion product or oxide films at 50 and 70 ms−1. The specimen surfaces were observed with a video camera connected to a computer. The indented and spalled and detached areas of the films were measured by using image processing. Impact tests with the same particle size were performed on metal surfaces at room temperature to obtain height distributions of piling-up surfaces around the indentations.