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Explosibility of micron- and nano-size titanium powders
journal contribution
posted on 2023-05-18, 03:13 authored by Boilard, SP, Amyotte, PR, Faisal KhanFaisal Khan, Dastidar, AG, Eckhoff, RKExplosibility of micron- and nano-titanium was determined and compared according to explosion severity and likelihood using standard dust explosion equipment. ASTM methods were followed using a Siwek 20-L explosion chamber, MIKE 3 apparatus and BAM oven. The explosibility parameters investigated for both size ranges of titanium include explosion severity (maximum explosion pressure (Pmax) and size-normalized maximum rate of pressure rise (KSt)) and explosion likelihood (minimum explosible concentration (MEC), minimum ignition energy (MIE) and minimum ignition temperature (MIT)). Titanium particle sizes were -100 mesh (<150 μm), -325 mesh (<45 μm), ≤20 μm, 150 nm, 60-80 nm, and 40-60 nm. The results show a significant increase in explosion severity as the particle size decreases from -100 mesh with an apparent plateau being reached at -325 mesh and ≤20 μm. Micron-size explosion severity could not be compared with that for nano-titanium due to pre-ignition of the nanopowder in the 20-L chamber. The likelihood of an explosion increases significantly as the particle size decreases into the nano range. Nano-titanium is very sensitive and can self-ignite under the appropriate conditions. The explosive properties of the nano-titanium can be suppressed by adding nano-titanium dioxide to the dust mixture. Safety precautions and procedures for the nano-titanium are also discussed. © 2013 Elsevier Ltd.
History
Publication title
Journal of Loss Prevention in the Process IndustriesVolume
26Issue
6Pagination
1646-1654ISSN
0950-4230Department/School
Australian Maritime CollegePublisher
Elsevier Sci LtdPlace of publication
The Boulevard, Langford Lane, Kidlington, Oxford, England, Oxon, Ox5 1GbRepository Status
- Restricted