Explosives are a class of materials that are chemically or energetically unstable, with heat production and a rapid rise in pressure, accompanied by a flash of light and a sound.
Usually explosives do not release as much potential energy as petroleum fuels, but the rapid release of energy can also produce a tremendous amount of explosive pressure. Explosives can be pure compounds such as nitroglycerin, or mixtures of oxidizers and fuels such as black powder. The development of new types of explosives requires the use of simultaneous thermal analysis.
Test conditions.
Temperature range: RT…300°C
Sample mass: 2.32mg
Temperature rise and fall rate: 5K/min
Crucible: Pt
Atmosphere: synthetic air, 70 ml/min
Sensor: TG-DSC S type
Test Conclusion.
The high-explosive explosive, Black Sorkin (also known as RDX, cyclotrimethylene trinitramine), begins to sublimate slightly above 150°C in the TG curve, and a sample fusion peak with an enthalpy of 123 J/g begins to appear at 206°C in the DSC curve.
A strong exothermic reaction occurs at 200°C to 250°C, releasing 1382 J/g of heat. The experiments were performed with synthetic air at a heating rate of 5 K/mim and an initial sample mass of only 2.32 mg. Using the synchrothermal analysis technique, specific detonation temperatures and heat release values can be obtained for the explosives.
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