摘要
复合固体推进剂中的铝粉在燃烧过程中容易与Al 2O 3形成凝聚相,降低推进剂比冲和喷管效率,并加重对喷管的烧蚀。为了改善铝粉在燃烧中的凝聚态团聚,研究者们选择将含氟物引入到固体推进剂中。本研究选取了一种含氟多元醇(PFD),采用化学接枝的方式将其分别添加到HTPE粘合剂和PET粘合剂体系中,结果表明两种体系的粘合剂聚氨酯胶片的力学性能都得到了明显提升。DSC和TG结果表明:含氟多元醇的加入对聚氨酯胶片的低温热转变性能没有产生较大影响,但是对其第一阶段的热分解表现出不同的结果,含氟多元醇的引入使HTPE第一阶段的热分解提前,且延缓了PET聚氨酯胶片第一阶段的分解。HTPE固体推进剂的激光点火和燃烧样品熄火表面形貌及元素分析结果表明:含氟多元醇的引入有效改善了铝粉的凝聚相团聚,提高了铝粉的燃烧效率。
The aluminum powder in the propellant can easily form a condensed phase with Al 2O 3 during the combustion process,which reduces the the specific impulse of propellant and the efficiency of nozzle,and aggravates the ablation of the nozzle.In order to improve the condensed agglomeration of aluminum powder during combustion,the researchers choose to introduce fluorine into the solid propellant.In this article,a fluorine-containing polyol was selected and added to two commonly used propellant adhesives(HTPE and PET).The mechanical properties of polyurethane film were significantly improved.The results of DSC and TG showed that the addition of fluorine-containing polyols did not have a large effect on the low temperature mechanical properties of the film,but showed different results for the thermal decomposition of the first stage.The introduction of the fluorine-containing polyol advanced the thermal decomposition of the first stage of the HTPE,but delayed the decomposition of the first stage of the PET polyurethane film.The laser ignition of the sample propellant and the surface element analysis of the flameout of the combustion sample showed that the introduction of the fluorine-containing polyol effectively improved the agglomeration of the condensed phase of the aluminum powder and increased the combustion efficiency.
作者
姚启发
杜修忻
张艳杰
夏敏
罗运军
YAO Qifa;DU Xiuxin;ZHANG Yanjie;XIA Min;LUO Yunjun(Key Laboratory of High Energy Density Materials,Ministry of Education,Beijing Institute of Technology,Beijing 100081,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第10期10187-10191,共5页
Materials Reports
基金
火炸药燃烧国防科技重点实验室基金(6142603030504)
中央高校基本科研业务费专项资金(3052017010)。
关键词
含氟多元醇
粘合剂
推进剂
fluorinated polyol
adhesive
propellant
