纳米Bi_2O_3·SnO_2的制备及对RDX热分解特性的影响

Synthesis of Nanocomposite Bi_2O_3·SnO_2 and Its Effect on Thermal Decomposition of RDX

为了研究纳米Bi2O3·SnO2对推进剂燃烧的催化作用,以BiCl3和SnCl4·5H2O为原料,采用共沉淀法制备出纳米Bi2O3·SnO2粉体,产物的粒径约为5nm。用DSC测试了纳米Bi2O3·SnO2对RDX热分解特性的影响。结果表明,纳米Bi2O3·SnO2对RDX热分解有明显的催化效果,使RDX的分解峰温前移了13.7℃,放热量增加665J/g,活化能降低49.42kJ/mol。

Nanocomposite oxide Bi2O3·SnO2 was synthesized by coprecipitation method using BiCl3 and SnCl4·5H2O as the reactant. The particle size, crystal form and phase were determined with XRD and TEM. Average particle size of samples were about 5 nm. The effect of nanocomposite oxide Bi2O3·SnO2 on the thermal decomposition characteristics of RDX was investigated by DSC. The results show that due to the effect of nanocomposite oxide Bi2O3·SnO2, the peak temperature of thermal decomposition of RDX shifts 13.7℃ downward, the decomposite enthalpy ΔH of RDX increases 665 J/g(about 59.9%), and the apparent activation energy of the thermal decomposition of RDX decreases 48.42 kJ/mol.