添加剂对PTFE/Zr70Cu13Ni10Al7反应活性的影响OA

To investigate the influence of different types and contents of additives on the reaction activity and thermal sensitivi-ty of composite materials,the formulations of PTFE/Zr70Cu13Ni10Al7-based composite systems were designed based on the oxy-gen balance principle.Using a wet mixing method,composites containing four types of additives:oxygen-supplying,catalytic,metal and non-metal,and energetic ignition types(with mass fractions of 5％,7.5％,and 10％),were prepared.Their re-activity and thermal sensitivity were evaluated through thermogravimetric analysis and 5 s explosion point tests.The results showed that all investigated additives could reduce the initial thermal decomposition temperature of the systems with various degrees(compared to 536.83 ℃ for pure PTFE/Zr70Cu13Ni10Al7).Among them,Fe2O3(mass fraction 10％)and KClO3(mass fraction 5％)exhibited the most significant effects,lowering the initial temperature to 490.04 ℃ and 494.41 ℃,re-spectively.Meanwhile,the systems containing KNO3(mass fraction 7.5％),B/KNO3(mass fraction 5％),and NC(mass fraction 7.5％)maintained relatively low initial thermal decomposition temperatures while demonstrated high 5s explosion points(304.8,309.9,and 311.7 ℃,respectively),indicating superior thermal safety.This demonstrates that the investiga-ted additives can effectively regulate the reaction characteristics of the PTFE/Zr70Cu13Ni10Al7 system,the additives with cata-lytic and oxygen-supplying features have the most prominent effects on enhancing reactivity,while energetic ignition additives help balance reactivity and thermal safety.