Steam chemical reactivity of Be pebbles and Be powder

This paper reports the results of chemical reactivity experiments for Be pe bbles (2-mm and 0.2-mm diameter) and Be powder (14-31 mum diameter) exposed to steam at elevated temperatures, 350 to 900 degreesC for pebbles and 400 to 500 degreesC for powders. We measured BET specific surface areas of 0.1 2 m(2)/g for 2-mm pebbles, 0.24 m(2)/g for 0.2mm pebbles and 0.66 to 1.21 m (2)/g for Be powder samples. These experiments showed a complex reactivity behavior for the material, dependent primarily on the test temperature. Ave rage H-2 generation rates for powder samples, based on measured BET surface areas, were in good agreement with previous measurements for fully-dense C PM-Be. Rates for the Be pebbles, based on measured BET surface areas, were systematically lower than the CPM-Be rates, possibly because of different s urface and bulk features for the pebbles, especially surface-layer impuriti es, that contribute to the measured BET surface area and influence the oxid ation process at the material surface.