Foamed in place igniter and aft-end assembly for rocket motor comprising the same

摘要

A process of forming an igniter in an aft-end assembly for a solid rocket motor, the assembly having an internal cavity and comprising at least one element selected from the group consisting of a nozzle (1), a blast tube (2) and an exit cone (3), which process comprises positioning an ignition package comprising pyrotechnic material (6) and an initiator (7) in the assembly cavity and causing a polymer foam (4) to expand and cure in the assembly cavity and around the ignition package, so as to embed and secure the ignition package, form an aft closure, and form the igniter as an integral portion of the assembly.;In addition, an aft-end assembly for a solid rocket motor is disclosed, which comprises at least one element selected from the group consisting of a nozzle (1), a blast tube (2) and an exit cone (3), the assembly having disposed therein polymer foam (4) surrounding an ignition package comprising pyrotechnic material (6) and an initiator (7) so as to embed and secure the ignition package, provide an aft closure, and form an integral portion of the assembly. The foam (4) is capable of filling an assembly having an internal cavity shaped such that a preformed, form-fitting foam igniter cannot be pushed into the assembly.