中文摘要：

采用热分析仪和可视化管式炉研究了添加KNO3对纳米铝粉在CO2气氛中的热反应特性和点火燃烧特性的影响.结果表明,随KNO3添加量增加,纳米铝粉着火点降低.添加1%和5%（ω）KNO3可分别使着火点温度降低18.3和37.9℃,并使燃烧特性指数增加,但增加程度逐渐降低.添加KNO3可加速纳米铝粉在CO2气氛中的点火过程,使铝粉氧化反应更剧烈.添加KNO3后纳米铝粉的燃烧产物中除有大量γ-Al2O3与少量单质Al外,还存在部分γ-Al2O3.

英文摘要：

The effects of KNO3 on the thermal reaction characteristics and ignition combustion phenomenon of nano-aluminum powder in CO2 were studied by thermal analysis techniques and visualization tube furnace. The results show that ignition temperature of nano-aluminum powder decreases with the increase of KNO3 concentration, the ignition temperature of nano-aluminurn powder with 1%（ω） and 5%（ω） KNO3 can be reduced by 18.3 and 37.9 ℃, respectively, and the combustion characteristic index of nano-aluminum powder increases, but the incremental rate gradually declines. Ignition of nano-aluminum powder with addition of KNO3 can be accelerated, so the oxidation of aluminum powder is more violent. Furthermore, the combustion products of nano-aluminum powder with KNO3 not only contain a large amount of γ-Al2O3 and a small amount of activated Al, but also have γ-Al2O3.