金属燃料在不同气氛中的点火温度

Ignition Temperature of Metal Fuel in Different Atmosphere

利用自行设计的金属燃料点火温度测试系统,测试了常压下分别在空气和氧气中的镁包覆硼粉(包覆度20%)、镁粉及铝合金am-Al的点火温度。结果表明,与在空气中相比,3种金属燃料在氧气中的点火温度均有所降低;镁包覆硼粉有效降低了硼的燃点,促进了硼的点火和燃烧,且镁包覆硼粉在氧气中更易燃烧,其点火温度仅为约195.92℃;am-Al在氧气中可点燃,其点火温度低于镁,且燃烧放出的热量最高。在充足的氧气环境下,镁包覆硼粉及am-Al的点火温度均低于300℃,二者均可用作高热值金属燃料。

Ignition temperature ofMg, B coated by Mg （coating rate 20%） and alloy am-A1 in air and oxygen at ambient pressure were studied, by use of self-designed experiment system. The result shows, ignition temperature in oxygen of all three metals are lower than that in air, B coated by Mg can significantly lower ignition point of B, and accelerate ignition and burning of B. Meanwhile, it is much easier for B coated by Mg to bum in oxygen, and the ignition temperature is only 195.92℃. Alloy am-Al can be ignited in oxygen, and the ignition temperature is lower than that of Mg. Among these three metal, alloy am-A1 release much more heat during combustion compared with other two powders, ignition temperature of B coated by Mg and alloy am-A1 are lower than 300 ℃, thus, both of them can be used as high calorific value metal fuel.