To understand the influence of the physical properties of carbon on the thermal decomposition behavior of ammonium nitrate (AN) and carbon mixtures, Raman spectroscopic analysis, differential scanning calorimetry (DSC), thermogravimetry- differential thermal analysis with infrared spectrometry (TG-DTA-IR), thermogravimetry-mass spectrometry (TG -MS), and flash pyrolysis mass spectrometry (Py-MS) were carried out. From DSC scanning analysis, AN mixed with activated carbon or carbon nanotubes exhibited violent reactions after the melting of AN, while AN mixed with graphite or fullerene showed mild exothermic peaks, the same as for pure AN. From the TG-IR results, the formation of carbon dioxide was more pronounced for AN and activated carbon and AN and carbon nanotube mixtures than other mixtures. Mass spectra of decomposition gases for AN and activated carbon and AN and graphite mixtures showed different patterns at a heating rate of 100 K min-1 with TG-MS, but they showed similar spectra when instantaneous heating with a flash pyrolyzer was performed. It is concluded that AN mixed with carbon of low crystallinity showed violent reactions after melting, while AN mixed with carbon of high crystallinity showed the same behavior as pure AN. The thermal decomposition behavior of AN/carbon mixtures was not influenced by the crystallinity of carbon when heated instantaneously.
硝酸アンモニウム（硝安）／炭素混合系の熱分解に及ぼす炭素物性の影響を検討するため，ラマン分光分析，示差走査 熱量測定（DSC），熱重量−示差熱分析熱−赤外分光分析（TG-DTA-IR），熱重量−質量分析（TG-MS），瞬間熱分解 質量分析（Py-MS）の各測定を行った。DSC昇温測定より，硝安に活性炭またはカーボンナノチューブを加えた混合系 では硝安の融解後に激しい発熱を観測したが，黒鉛またはフラーレンとの混合系では硝安単体同様の穏やかな発熱であっ た。TG-IR結果より，硝安と活性炭またはカーボンナノチューブとの混合系では他の組成に比べ二酸化炭素の発生が顕 著であった。硝安／活性炭および硝安／黒鉛の熱分解ガスは，昇温速度が100 K min-1時の発生ガスは異なるものの，瞬 間熱分解時には同様の組成を示した。以上より，硝安と低結晶化度炭素との混合系の熱分解は硝安の融解後に激しい発 熱を示すのに対し，高結晶化度炭素との混合系では硝安単体と同様の分解挙動を示すこと，および瞬間加熱時には，炭 素の結晶化度は硝安／炭素混合系の熱分解特性にほとんど影響を及ぼさないことが明らかとなった。
Ammonium nitrate, Carbon, Thermal decomposition, Evolved gas analysis