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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Sn/Mn/Bi2O3 Ternary Pyrotechnic Time Delay Compositions
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Sn/Mn/Bi2O3 Ternary Pyrotechnic Time Delay Compositions

机译：SN / MN / BI2O3三元烟火时间延迟组成

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摘要

Pyrotechnic compositions are usually employed in time delay detonators to facilitate controlled initiation of explosive charges in mining and quarrying operations. Traditional slow-burning formulations are problematic, as they contain heavy metals which are bio-accumulative and toxic to the environment. A combination of traditional thermite and intermetallic reactions using “green” reagents was therefore investigated as a possible alternative. It was hypothesized that the high thermite reaction temperature would ensure a sustained intermetallic reaction, resulting in the desired slow-burning effect. A ternary composition comprising manganese and tin as fuels mixed with bismuth oxide as an oxidizer was used to explore this concept. Burn rates ranging from 2.9 to 10.9 mm·s~(–1) were obtained and were dependent on the relative proportions of the reagents. Burn rate predictions, using a Padè mixture model, were in close agreement with the measured data. The reaction products consisted of mixtures of metal oxides, manganese stannate, and Mn_(3)Sn, which was the only intermetallic formed. The slowest burning compositions were those associated with the formation of this intermetallic compound.
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