碳对无定形硼颗粒的点火燃烧特性影响

Effect of Carbon on the Ignition and Combustion Characteristics of Amorphous Boron Particles

碳是硼一次燃烧产物的主要成分,对硼的二次点火燃烧有重要的影响。采用热重差示量热扫描(TG-DSC)、X射线衍射(XRD)和激光点火试验系统研究了不同配比的碳对无定形硼颗粒点火燃烧特性的影响。试验采用的硼、碳混合样品碳含量分别为0%、10%、20%、50%和100%,结果表明,碳的添加降低了样品加热过程中的增重量。碳含量对加热过程的影响是复杂的。当样品的碳含量不大于10%,样品的氧化反应推迟,放热量增加。当样品的碳含量进一步升高,又会使样品的氧化反应提前,放热量减少。在氧气气氛下,随碳含量的增加,样品的燃烧峰值强度减弱,燃烧时间从2436 ms增加到2909 ms,但碳对样品的点火时间的延迟较小,最多不超过3 ms。样品燃烧产物呈黑色块状固体,主要成分有氧化硼和单质碳等。对样品燃烧产物的分析表明,样品的点火燃烧反应并不充分。

Carbon is the main component of a combustion products of boron. It has important influence to secondary ignition combustion.The influence of different contents of carbon on the ignition and combustion characteristics of boron particles was studied by thermogravimetry（TG） and differential scanning calorimetry（ DSC）,X-ray diffractometer（ XRD） and laser ignition test system. The mass contents of carbon in the mixture of boron and carbon samples were set to be 0%,10%,20%,50% and 100%. Results indicate that the addition of carbon make the sample weight gain lower during the process of heating. The influence of the mass content of carbon on the heating process is complex. When the content of carbon is low,the oxidation reaction delays and the heat release increases,while as it increases,the results turn to be opposite. Under oxygen atmosphere,with an increase in the mass content of carbon,the maximum combustion peak intensity of the sample decreases,the burning time of the sample is prolonged from 2436 ms to 2909 ms,but the ignition delay of carbon to the sample is less,not more than 3 ms. The combustion products are black massive solid,which mainly consist of boron oxide and carbon,etc. The analysis of the combustion products of the sample shows that the ignition combustion reaction of the sample is not sufficient.