Abstract In order to analyze the inhibition effect of the additive on the thermal decomposition characteristics of ammonium nitrate (AN), thermal stability and thermal decomposition behavior of AN and its mixtures with various concentrations of ammonium dihydrogen phosphate (ADP) are systematically investigated by DSC-TG, DSC-TG-QMS and TG-FTIR. Breaking point value of the samples is obtained as an evaluation parameter for thermal safety. Experimental results show that the AN-ADP mixtures show higher onset decomposition temperatures, narrower reaction temperature region and lower enthalpy values than those of pure AN. The main evolved decomposition gases of AN are NH3, H2O, NO, N2O, NO2 and HNO3, while the major gaseous products of the AN mixture with ADP are NH3, H2O, NO, N2O and NO2. Furthermore, the generation of NO and NO2 is obviously postponed in the AN mixture. In addition, the breaking point value of AN is markedly improved by ADP. The decomposition mechanism of AN-ADP mixture is concluded and the inhibition mechanism of ADP is proposed. It is concluded that ADP is an effective inhibitor for AN and its thermal stability is effectively enhanced.

中文翻译：

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磷酸二氢铵对硝酸铵热分解特性和热敏性的抑制作用

摘要 为了分析添加剂对硝酸铵（AN）热分解特性的抑制作用，采用DSC-系统研究了硝酸铵及其与不同浓度磷酸二氢铵（ADP）混合物的热稳定性和热分解行为。 TG、DSC-TG-QMS 和 TG-FTIR。获得样品的断点值作为热安全性的评价参数。实验结果表明，与纯 AN 相比，AN-ADP 混合物显示出更高的起始分解温度、更窄的反应温度范围和更低的焓值。AN 的主要分解气体是 NH3、H2O、NO、N2O、NO2 和 HNO3，而 AN 与 ADP 混合物的主要气态产物是 NH3、H2O、NO、N2O 和 NO2。此外，NO 和 NO2 的生成在 AN 混合物中明显推迟。此外，ADP 显着提高了 AN 的断点值。总结了AN-ADP混合物的分解机理，提出了ADP的抑制机理。结论是ADP是AN的有效抑制剂，其热稳定性得到有效增强。