Abstract
The impact of carbonyl-iron microparticles on a hot aluminium target (300 ≤ T ≤ K) has been studied. The velocities of micro-sized impinging microparticles range from 20 to 200 ms -1. Within this experimental range the same phenomena as those noticed at room temperature were observed, namely the coefficient of restitution e decreases when impact velocity increases; impact is highly inelastic; and spherical indentations appear on the target surface. However, e decreases with increasing temperature, the size of indentations increases and the electrical-charge exchange between microparticles and the target is significantly altered. These preliminary data do not seem likely to alter the mechanisms of breakdown initiation by microparticles in vacuum.
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