纳米CoFe_2O_4与Al/CoFe_2O_4的制备及对RDX热分解性能的影响

Preparation of Nano-CoFe_2O_4,Al/CoFe_2O_4 and Their Effects on Thermal Decomposition Performance of RDX

采用水热法制备出纳米CoFe2O4颗粒,再通过超声混合法制备出Al/CoFe2O4混合物,用X射线粉末衍射(XRD)和扫描电子显微镜-能谱仪(SEM-EDS)测试了其成分和形貌特征。按CoFe2O4或Al/CoFe2O4与RDX质量比1∶4、通过超声混合法分别制备出CoFe2O4/RDX、Al/CoFe2O4/RDX样品,并用差示扫描量热法(DSC)研究了CoFe2O4和Al/CoFe2O4对RDX热分解的影响。结果表明,纳米CoFe2O4和Al/CoFe2O4的加入不会改变RDX热分解过程遵循的最可几机理函数,但混合物的热分解峰温明显降低;且CoFe2O4/RDX和Al/CoFe2O4/RDX混合体系的表观活化能相对于RDX有所降低,说明CoFe2O4和Al/CoFe2O4的加入促进了RDX的分解。

Nanoparticle CoFe2O4 and Al/CoFe2O4 were prepared by hydrothermal method and ultrasonic mixing method,respectively.Their composition and morphology features were measured using X-ray diffraction(XRD)and Scanning Electron Microscope-Energy Dispersive Spectrometry(SEM-EDS).CoFe2O4/RDX and Al/CoFe2O4/RDX,according to the mass ratio of 1∶4,were prepared by ultrasonic mixing method.The effects of CoFe2O4 and Al/CoFe2O4 on the thermal decomposition of RDX were investigated by a differential scanning calorimetry(DSC).The results show that the addition of nano CoFe2O4 and Al/CoFe2O4 does not change the most probable mechanism function of the decomposition process of RDX.While after CoFe2O4 and Al/CoFe2O4 being added,the peak temperature of the thermal decomposition for the mixture exhibits a significant decrease.Moreover,the apparent activation energies of the mixed systems of CoFe2O4/RDX and Al/CoFe2O4/RDX decrease in comparison with that of RDX,indicating that the addition of CoFe2O4 and Al/CoFe2O4 can promote the decomposition of RDX.