摘要
基于铅丹和硅的物理化学特性,对铅丹-硅系延期药在常温封闭贮存下发生自发氧化还原反应的可能性及其反应机理进行了研究。给出了药剂贮存中可能发生的化学反应方程式,计算了各反应的主要热力学参数ΔrGθm、ΔrHθm、ΔrSθm,通过对热力学参数的分析,讨论了各反应的自发性。结合固体化学和薄膜生长理论,建立了药剂氧化还原反应的扩散模型和硅粉表面的氧化模型。结果表明,单一Pb3O4在贮存中不会自发分解,但是,当Pb3O4与Si混合后贮存时,两者发生氧化还原反应,部分反应产物PbO会驻留在SiO2的网络结构中。
Based on the physical and chemical properties of red lead and silicon, the possibilities and reaction mecha- nism of the spontaneous redox reaction occurred in the red lead/silicon delay composition were researched, which were stored at normal temperature and closed environment. The possible chemical reaction equations in the storage course of delay composition were enumerated. The thermodynamic parameters of these reactions, such as ArGθm , Ar Hθm, ArSθmwere calculated. The spontaneity of each reaction was discussed by analyzing the thermodynamic parame- ters. Combined the theory of solid chemistry with thin film growth, the redox diffusion model of the delay composi- tion and the oxidation model on the surface of silicon powder were established. Results indicate that the single Pb3 O4 has no spontaneous decomposition reaction in the storage, but when Pb304 is mixed with silicon and then stored, the redox reaction happens in the two components, and part of the reaction product PbO will reside in net- work structure of SiO2.
出处
《火炸药学报》
EI
CAS
CSCD
北大核心
2014年第2期86-90,共5页
Chinese Journal of Explosives & Propellants
关键词
物理化学
氧化还原反应
表面氧化模型
化学热力学
化学动力学
铅丹-硅系延期药
physical chemistry
redox reaction
surface oxidation model
chemical thermodynamics
chemical kinet-ics
red lead/silicon delay composition
