Exothermic Effects in Mixtures of Several Low-Molecular Organic Compounds with 50 wt % Aluminum after High-Pressure Plastic Deformation

摘要

DSC and thermogravimetry show that the thermal decomposition of anthracene, adamantane, melamine, pentaerythritol, cyanuric, aspartic and succinic acids is followed by endothermic effects. It is found that the enthalpies of endothermic processes vary from 500 J g(-1) (for adamantane) to 1900 J g(-1) (for pentaerythritol) and depend on the elemental composition of the organic compounds. The plastic deformation of the mixtures of the organic compounds containing 50 wt % of aluminum is done at a pressure of 1 GPa in a high-pressure apparatus of the anvil type. Endothermic peaks are registered in the thermograms of mixtures containing anthracene, melamine, and cyanuric acid in the temperature range of the decomposition of the organic compounds; exothermic peaks are registered in the thermograms of mixtures containing adamantane, succinic acid, pentaerythritol, and aspartic acid. Exothermic processes related to the oxidation and nitriding of aluminum are registered in the thermograms of all mixtures in the temperature range of 400-800 degrees C. The total enthalpies of exothermic processes in deformed samples are determined. They vary from 1.9 kJ g(-1) (for the mixture containing melamine) to 36.0 kJ g(-1) (for the mixture containing pentaerythritol). The dependences of the results from DSC and thermogravimetric studies on the gaseous medium used in measuring (air, nitrogen, or argon) are determined.