Abstract This paper reported the preparation, fire suppression efficiency, and suppression mechanism of a new suppression powder. In present work, the new suppressant was designed for combining the ability of terminating the chain reactions into the powder extinguishing agent. The trifluoroacetyl group (COCF3) was grafted onto the silicon dioxide (SiO2), and called the compound SiO2–F. Several tests for characterizing the structure and morphology of the compound powder were done. The results indicated that the powder was prepared successfully. Then, the burning velocity of methane-air flame with powder addition and minimum extinguishing concentration were measured to evaluate the fire suppression efficiency. In comparison with NaHCO3 and SiO2 powders, the SiO2–F powder had more pronounced fire suppression efficiency. Furthermore, the fire suppression mechanism of the powder was systematically studied. The physical and chemical suppression mechanisms worked together to suppress the flame. The physical suppression mainly stemmed from the heat absorption of solid substances, and occupied 23.1% of the total suppression effect. The chemical suppression was mainly due to the termination of chain reactions by the fluorinated species which were released when the powder was exposed to high temperature.

中文翻译：

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一种复合二氧化硅-三氟乙酰基粉体灭火剂的制备、表征及抑制机理探讨

摘要 本文报道了一种新型抑制火药的制备、灭火效率和抑制机理。在目前的工作中，新型抑制剂被设计用于将终止链式反应的能力结合到粉末灭火剂中。三氟乙酰基（COCF3）接枝到二氧化硅（SiO2）上，称为化合物SiO2-F。进行了一些表征复合粉末结构和形态的测试。结果表明粉末制备成功。然后，通过测量添加粉末的甲烷-空气火焰的燃烧速度和最小灭火浓度来评估灭火效率。与 NaHCO3 和 SiO2 粉末相比，SiO2-F 粉末具有更显着的灭火效率。此外，系统研究了粉体的灭火机理。物理和化学抑制机制共同作用来抑制火焰。物理抑制主要来源于固体物质的吸热，占总抑制效果的23.1%。化学抑制主要是由于粉末暴露于高温时释放的氟化物质终止了链式反应。