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| The Relationship between Thermal Decomposition Characteristics and Slow Cook-off Behaviour of PBT-based Propellants |
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| DOI：10.7643/issn.1672-9242.2022.10.006 |
| KeyWord:PBT-based propellant slow cook-off thermal decomposition low vulnerability dynamics aerospace material |
| Author | Institution |
| LI Yang |
Jianghe Chemical Technology Co., Ltd., Hubei Yichang, , China |
| WANG Xiao-qian |
Jianghe Chemical Technology Co., Ltd., Hubei Yichang, , China |
| LIU Jie |
Jianghe Chemical Technology Co., Ltd., Hubei Yichang, , China |
| NIU Cao-ping |
Jianghe Chemical Technology Co., Ltd., Hubei Yichang, , China |
| WU Bin |
Jianghe Chemical Technology Co., Ltd., Hubei Yichang, , China |
| GAN Lu |
Jianghe Chemical Technology Co., Ltd., Hubei Yichang, , China |
| LIN Feng |
Jianghe Chemical Technology Co., Ltd., Hubei Yichang, , China |
| ZOU Yan-hong |
Jianghe Chemical Technology Co., Ltd., Hubei Yichang, , China |
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| Abstract: |
| This paper aims to study the relationship between the slow cook-off response of PBT-based propellant and the thermal decomposition characteristics. Adopting DSC and slow cook-off experiments, we studied the thermal decomposition temperature that changes in the content of pushing agents in different solid content (changing the AP content) and different aluminum powder content as well as calculated the thermal decomposition dynamic parameters of the promotion agent under different component content. Also, we compared and analyzed the impaction of PBT base pushing agent solid content, aluminum powder content to thermal decomposition characteristics and slow roasting behavior. The results showed that when the solid content decreased from 78% to 75%, the thermal decomposition temperature and activation energy of AP in the formula decreased at high temperature and low temperature. When the aluminum power content decreased from 18% to 5%, the high temperature and low temperature decomposition temperature and activation energy in the formula also decreased. When the solid content of 78% is used, the recipe fails the slow cook-off, while using 75% solids, both 18% and 5% aluminum power passed the slow cook-off. According to the results of thermal analysis and slow cook-off tests, it can be seen that the change of solid content has a great influence on the response of slow cook-off, and the change of aluminum power content has little effect on it. The slow cook-off response of the formula is mainly controlled by AP pyrolysis. The lower the activation energy of AP pyrolysis, the better the propellant can pass the slow cook-off test. |
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