为分析磷酸二氢铵 (ABC)、三聚氰胺焦磷酸盐 (MPP)、三聚氰胺氰尿酸盐(MCA) 3 种阻燃粉体抑制锆粉云爆炸强度的效果和机理，采用 20L 近球形爆炸实验系统和热重 － 差热分析仪开展研究。结果表明: ABC、MPP、MCA 阻燃粉体对锆粉云爆炸强度都有抑制作用; ABC 粉对锆粉云爆炸的抑制效果占有极大的优势，200g/m 3 ABC 粉可完全抑制住锆粉云在最猛烈状态时的爆炸; 在锆粉中分别添加这 3 种阻燃粉体的混合体系在空气中被加热都是增重 － 失重 － 再增重、放热 － 吸热 － 再放热的过程; 阻燃粉体的分解温度越低，对抑制锆粉的氧化越有利; 当锆粉与阻燃粉体的质量比为 2 ∶ 1 时，锆粉分别添加 ABC、MPP、MCA 粉后，锆粉快速氧化反应的起始温度从 257. 08 ℃分别提升到 591. 45、581. 43 和 401. 30℃; ABC 粉对锆粉云爆炸的抑制效果较佳，其原因是这种粉体更好地延长了锆粉发生快速氧化反应的时间，提升了锆粉发生快速氧化的起始温度，最大化抑制了锆粉燃烧过程。

In order to analyze the effect and mechanism of three flame retardant powders，namely，Ammonium dihydrogen phosphate (ABC)，Melamine Pyrophosphate (MPP)，and Melamine Cyanurate (MCA)，on suppressing the explosion intensity of zirconium dust clouds，A 20-L near-spherical explosion test system and a thermogravime-tric and differential thermal analyzer were used to carry out experiments． The results show that all three flame retar-dant powders can effectively inhibit the explosion intensity of zirconium dust clouds． ABC powder has a significant advantage in inhibiting the explosion of zirconium dust clouds，and ABC powder of 200g/m 3 can completely inhibit the most violent explosion of zirconium dust clouds． When the mixture of zirconium powder and these three kinds of flame retardant powders are heated in air atmosphere，the process of variation appears to be from weight gain to weight loss then to weight gain，and from exothermic reaction to endothermic recreation then to exothermic reaction．The lower decomposition temperatures of flame retardant powder are，the better inhibiting performance of oxidation of zirconium powder is． When the mass ratio of zirconium powder to flame retardant powder is 2∶ 1，the starting temperature of the rapid oxidation reaction of zirconium powder augment from 257. 08 ℃ to 591. 45，581. 43 and 401. 30℃ with the additions of ABC，MPP，and MCA powder，respectively． ABC powder possesses the best inhi-bition effect on the explosion of zirconium dust clouds among the tested samples because of ABC powder prolonging the time of rapid oxidation reaction of zirconium powder，enhancing the starting temperature of rapid oxidation of zirconium powder，and maximizing the inhibition of the combustion process of the zirconium powder．