The elimination of halon and frequent fire accidents have caused an urgent need for the development of high-efficient fire extinguishing agents. ABC dry powder has been paid much attention, and has become one of the most extensively used fire extinguishing agents nowadays owing to its wide applications in various fire protection fields. Therefore, to enhance the fire-extinguishing properties of ABC dry powder, ferrocene was used as the additive to develop a new composite ultrafine dry powder based on an ultrafine ABC dry powder product. Through flame inhibition tests, two performance indexes of the inhibition process, namely temperature drops and flame height variations, were adopted to measure the degree of flame suppression. The experimental results revealed that the temperature drops and flame height variations both increased and then decreased. Moreover, the composite ultrafine dry powder containing 0.7% ferrocene displayed the best inhibitory effect with the maximum temperature drop (152.9°C) and variation rate of flame height (14.01%). Thermogravimetric analysis and differential scanning calorimetry were used to analyze the thermal decomposition of the sample powders. Furthermore, based on the analysis results of the thermal decomposition temperature, weight loss, and other thermodynamic parameters of the sample powders, the reasons for performance advantages of composite ultrafine dry powder containing 0.7% ferrocene were clarified as the faster pyrolysis rate, more absorption of heat, stronger suffocation and chemical inhibition effect. Finally, possible speculations on the suppression mechanisms of composite ultrafine dry powder containing 0.7% ferrocene were proposed.

中文翻译：

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复合超细干粉中二茂铁最佳浓度的实验研究

哈龙的消除和火灾事故的频繁发生，迫切需要开发高效的灭火剂。ABC干粉因其在各个消防领域的广泛应用而备受关注，成为当今应用最广泛的灭火剂之一。因此，为增强ABC干粉的灭火性能，以二茂铁作为添加剂，在超细ABC干粉产品的基础上开发了新型复合超细干粉。通过火焰抑制试验，采用温度下降和火焰高度变化这两个抑制过程的性能指标来衡量火焰抑制的程度。实验结果表明，温度下降和火焰高度变化均先增大后减小。此外，含有0.7%二茂铁的复合超细干粉表现出最好的抑制效果，最大温降（152.9℃）和火焰高度变化率（14.01%）。热重分析和差示扫描量热法用于分析样品粉末的热分解。此外，根据样品粉末的热分解温度、失重等热力学参数的分析结果，阐明了含有0.7%二茂铁的复合超细干粉性能优势的原因是热解速度更快，吸收更多。热，有较强的窒息和化学抑制作用。最后，对含0.7%二茂铁的复合超细干粉的抑制机理提出了可能的推测。含0.7%二茂铁的复合超细干粉抑制效果最好，最大温降（152.9℃）和火焰高度变化率（14.01%）。热重分析和差示扫描量热法用于分析样品粉末的热分解。此外，基于样品粉末的热分解温度、失重等热力学参数的分析结果，阐明了含有0.7%二茂铁的复合超细干粉性能优势的原因是热解速度更快，吸收更多。热，有较强的窒息和化学抑制作用。最后，对含0.7%二茂铁的复合超细干粉的抑制机理提出了可能的推测。含0.7%二茂铁的复合超细干粉抑制效果最好，最大温降（152.9℃）和火焰高度变化率（14.01%）。热重分析和差示扫描量热法用于分析样品粉末的热分解。此外，基于样品粉末的热分解温度、失重等热力学参数的分析结果，阐明了含有0.7%二茂铁的复合超细干粉性能优势的原因是热解速度更快，吸收更多。热，有较强的窒息和化学抑制作用。最后，对含0.7%二茂铁的复合超细干粉的抑制机理提出了可能的推测。