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采用热分析仪和可视化管式炉研究了包覆剂高氯酸铵(AP)对纳米铝粉(nAl)在CO_2中热反应特性及点火燃烧特性的影响.结果表明,由于热分析仪及可视化管式炉中升温速率不同导致AP分解过程不同,使nAl的点火燃烧特性有一定差别;升温速率较慢时,包覆AP的nAl着火温度比未包覆nAl升高,但由于AP分解产生的O_2能促进nAl反应,所以包覆的nAl增重率大于未包覆的nAl,且随包覆剂浓度升高,样品增重率增大;升温速率较快时,包覆AP的nAl着火温度比未包覆的nAl均有明显降低,包覆10%与15%AP的nAl由于AP剧烈分解对着火影响明显,使着火温度下降约200℃.
The effects of coating agent ammonium perchlorate (AP) on the thermal reaction characteristics and ignition and combustion characteristics of nano-aluminum powder (nAl) in CO_2 were investigated by means of thermal analysis and visualized tube furnace. The results showed that thermal analysis and visualization Different heating rates in tube furnace lead to different decomposition process of AP, which makes the ignition and combustion characteristics of nAl different. When the heating rate is slow, the nAl ignition temperature of coated AP is higher than that of uncoated nAl, but due to AP decomposition O 2 can promote the nAl reaction, so the weight gain of coated nAl is larger than that of uncoated nAl. With the increase of coating concentration, the sample weight gain rate increases. When the heating rate is faster, the nAl ignition temperature Compared with uncoated nAl, the average particle size of nAl coated with 10% and 15% AP was significantly affected by the severe decomposition of AP, which decreased the ignition temperature by about 200 ℃.