Ignition temperatures and flame velocities of metallic nanomaterials |
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Institution: | 1. Physikalisch Technische Bundesanstalt, Bundesallee 100, Braunschweig 38116, Niedersachsen, Germany;2. FBI - V?B Technical University of Ostrava, Listopadu 2172, Ostrava 70800, Moravskoslezský kraj, Czech Republic;3. Otto von Guericke University, Universitätsplatz 2, Magdeburg 39106, Saxony-Anhalt, Germany;4. Bundesanstalt fuer Materialforschung und -pruefung, Unter den Eichen 87, Berlin 12205, Germany |
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Abstract: | The production of materials with dimensions in the nanometre range has continued to increase in recent years. In order to ensure safety when handling these products, the hazard potential of such innovative materials must be known. While several studies have already investigated the effects of explosions (such as maximum explosion pressure and maximum pressure rise) of powders with primary particles in the nanometre range, little is known about the ignition temperatures and flame velocities. Therefore, the minimum ignition temperature (MIT) of metallic nano powders (aluminium, iron, copper and zinc) was determined experimentally in a so called Godbert-Greenwald (GG) oven. Furthermore, the flame velocities were determined in a vertical tube. In order to better classify the test results, the tested samples were characterised in detail and the lower explosion limits of the tested dust samples were determined. Values for the burning velocity of aluminium nano powders are higher compared to values of micrometre powders (from literature). While MIT of nanometre aluminium powders is within the range of micrometre samples, MIT of zinc and copper nano powders is lower than values reported in literature for respective micrometre samples. |
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Keywords: | Dust explosion Nanomaterials Minimum ignition temperature (MIT) Flame velocity |
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