Advancements in fire safety technology have led to the development of expanded graphite (EG)/NaCl composite powder, a dry powder fire extinguishing agent specifically for metal fires. This study used custom apparatus to examine the fire suppression properties of this composite powder in relation to its constituent elements, EG and NaCl. Compared to pure EG, this composite powder has a smaller particle size and better thermal stability. The flames of a sodium metal fire were effectively suppressed using only 8 g of the EG/NaCl composite powder. The powder suppressed the flames within 22 s. This performance surpassed that of the use of EG or NaCl alone. Moreover, after the fire was extinguished, the temperature decreased at a rate of 1.23 °C/s within the temperature range of 350–250 °C. This rate was 15.44% and 44.78% faster than those of EG and NaCl, respectively. The suppressive effects of the EG/NaCl composite powder are primarily attributed to heat absorption—which prevents contact between combustible metals and air—and the adsorption of depleting H∙ and OH∙ radicals. These results indicate that EG/NaCl composite powder has promising firefighting applications, particularly in fires involving the burning of metals.

消防安全技术的进步导致了膨胀石墨（EG）/氯化钠复合粉末的开发，这是一种专门用于金属火灾的干粉灭火剂。本研究使用定制设备来检查这种复合粉末的灭火性能与其组成元素 EG 和 NaCl 的关系。与纯EG相比，这种复合粉末具有更小的粒径和更好的热稳定性。仅使用 8 克 EG/NaCl 复合粉末即可有效抑制钠金属火灾的火焰。粉末在 22 秒内抑制了火焰。该性能超过了单独使用 EG 或 NaCl 的性能。而且，火灾扑灭后，在350~250℃的温度范围内，温度以1.23℃/s的速率下降。该速率分别比EG和NaCl快15.44%和44.78%。EG/NaCl 复合粉末的抑制作用主要归因于吸热（防止可燃金属与空气接触）以及消耗 H∙ 和 OH∙ 自由基的吸附。这些结果表明EG/NaCl复合粉末具有广阔的消防应用前景，特别是在涉及金属燃烧的火灾中。