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首页> 外文期刊>Combustion, Explosion, and Shock Waves >Ignition, combustion, and oxidation of mixtures of amorphous and crystalline boron powders
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Ignition, combustion, and oxidation of mixtures of amorphous and crystalline boron powders

机译：非晶态和结晶态硼粉混合物的着火，燃烧和氧化

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摘要

Ignition, combustion, and oxidation characteristics of mixtures of amorphous and crystalline boron powders are studied by using a laser ignition system and a thermogravimetric analyzer. Yellow, green, and white-glow flames are observed. When the weight ratio of the amorphous boron powder (K) is lower than 0.33, burning of the mixtures is found to be at the ignition stage, while the combustion stage gradually appears with increasing K. The emission spectrum intensity is weakened by 3/4 as K decreases from 1 to 0.75. No obvious emission spectrum is detected at K < 0.33. The ignition delay time is found to decrease significantly with increasing K, but it does not change much at K < 0.8. Mixtures with larger values of K have a lower peak temperature of differential thermal gravity and a greater weight gain and maximum reaction rate. The Satava-Sestak method is applied to study the kinetics of the oxidation reaction of the mixtures. The calculated apparent activation energy decreases from 297 to 191 kJ/mol as K increases from 0 to 1. For mixtures with K ranging from 0.23 to 0.75, the apparent activation energy mainly stays constant at a value of 280 kJ/mol.
机译：使用激光点火系统和热重分析仪研究了非晶态和结晶态硼粉混合物的点火，燃烧和氧化特性。观察到黄色，绿色和白色发光火焰。当非晶态硼粉（K）的重量比低于0.33时，发现混合物在点火阶段燃烧，而燃烧阶段随着K的增加而逐渐出现。发射光谱强度减弱了3/4随着K从1降低到0.75。在K <0.33处未检测到明显的发射光谱。发现点火延迟时间随着K的增加而显着减少，但在K <0.8时并没有太大变化。具有较大K值的混合物具有较低的差热引力峰值温度和较大的增重和最大反应速率。 Satava-Sestak方法用于研究混合物氧化反应的动力学。随着K从0增加到1，计算得出的表观活化能从297降低到191 kJ / mol。对于K在0.23到0.75之间的混合物，表观活化能主要保持恒定，值为280 kJ / mol。

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