无预固化衬层成型工艺对界面粘接强度的影响

采用钢/ 三元乙丙绝热层/ 衬层( K/ J/ B) 粘接试件和钢/ 三元乙丙绝热层/ 衬层/ 推进剂( K/ J/ B/ Y)矩形试件,对三元乙丙(EPDM)绝热层、无预固化衬层界面粘接强度进行测试,研究了EPDM 绝热层表面处 理工艺、衬层成型厚度以及衬层成型后装药间隔时间对界面粘接性能的影响。结果表明:无预固化衬层与表面 未处理的EPDM 绝热层粘接强度约1. 0 MPa,而EPDM 绝热层表面处理后,无预固化衬层与绝热层和推进剂界 面的粘接良好。无预固化衬层成型厚度为0. 3 ~0. 5 mm,界面粘接强度基本不变;衬层成型厚度增大到0. 7 mm,则界面粘接强度逐步增加。K/ J/ B/ Y 断裂面均在推进剂间,界面良好无异常;装药间隔时间从4 h 延长至 24 h,对K/ J/ B/ Y 粘接强度影响较小,无预固化衬层完全可以按照现行装药工艺进行装药。

Effects of Non-Precure Lining Process on Interface Bonding Strength of Double Pulse SRM

Effects of insulator surface treatment, liner thickness, and the time between the lining and casting on interface bonding property had been investigated in the way that interface bonding strength was tested using K/ J/ B and K/ J/ B/ Y rectangular specimen. The results show that bonding strength between non-precure liner and non-roughened EPDM insulator is only 1. 0 MPa. In order to ensure good bonding ,the surface of EPDM insulator must be roughened and cleaned first. When liner thickness is between 0. 3 to 0. 5mm, the bonding strength does not change. But when it increace to 0. 7 mm , the bonding strength is increasing. K/ J/ B/ Y specimen test is OK, break took place inside propellant. Time from 4h to 24h of end of lining and casting has little effects on interface bonding strength. Non-precure liner has no effects on standing process procedure.