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分别制备了两组粒径的Mn金属燃料(平均粒径分别为18.73和5.24μm),利用激光粒度分析仪测试了其粒径分布,扫描电镜分析了表面形貌,能谱仪确定了所含元素.对NaClO_3,NaClO_3与Co_3O_4,NaClO_3、Co_3O_4与Mn的混合物分别进行了热重与示差扫描量热联合分析实验(TGA-DSC),通过对比各混合物热解起始温度及其他特征温度,探究了Mn金属粒径对NaClO_3热解的催化强度与热解稳定性的影响.研究结果表明:Co_3O_4虽对NaClO_3热解具有催化性,热解开始温度(To)由512.3℃下降为333.0℃,但其可导致NaClO_3热解的不稳定,热解阶梯由1个变为3个;Mn金属燃料对NaClO_3中间产物具有明显的催化性,且随着粒径减小,催化强度逐渐增加,热解终止温度(Tf)由419.8℃下降为351.9℃,同时NaClO_3热解阶梯减少,热解温度区间变窄(由180.6℃减小为19.4℃),热解更加稳定.
Two kinds of Mn metal fuels with average particle sizes of 18.73 and 5.24μm were prepared respectively. The particle size distribution was tested by laser particle size analyzer. The surface morphology was analyzed by scanning electron microscopy. Element.A mixture of NaClO_3, NaClO_3 and Co_3O_4, NaClO_3, Co_3O_4 and Mn were respectively analyzed by TG-DSC and TGA-DSC. By comparing the onset temperature of pyrolysis and other characteristic temperature of each mixture, The effect of Mn particle size on the catalytic strength and pyrolysis stability of NaClO_3 pyrolysis was studied.The results show that Co_3O_4 has a catalytic effect on the thermal decomposition of NaClO_3 and the starting temperature (To) of pyrolysis is decreased from 512.3 ℃ to 333.0 ℃ Which can lead to the instability of the pyrolysis of NaClO_3, and the pyrolysis step changes from 1 to 3. Mn metal fuel has obvious catalytic activity on the NaClO_3 intermediate product. With the decrease of the particle size, the catalytic strength gradually increases and the pyrolysis stops The temperature (Tf) decreased from 419.8 ℃ to 351.9 ℃. At the same time, the pyrolysis temperature of NaClO_3 decreased and the pyrolysis temperature range narrowed from 180.6 ℃ to 19.4 ℃. The pyrolysis was more stable.