Accession Number:

ADA242297

Title:

Case Bond Liner Systems for Solid Rocket Motors

Descriptive Note:

Technical rept.

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA MATERIALSSCIENCES LAB

Personal Author(s):

Report Date:

1991-04-01

Pagination or Media Count:

21.0

Abstract:

Construction of a case bond liner system for solid rocket motors involves a series of processes designed to satisfy a variety of launch vehicle parameters. An attempt to understand the chemistry and processing variables and how they affect the interfacial bonding properties in barrier liner propellant formulations is presented. Inter diffusion rates and the rate of cure of each to the layers must be considered together to minimize changes in cure stoichiometries in the interfacial zones. The control of barrier layer cure is essential, not only to reduce migration of reactants and plasticizer from liner and propellant, but also to provide an active surface for adhesion to the liner. The importance of the proper characterization of the hydroxylterminated polybutadiene binder should not be underestimated. Because the binder material is a constituent of both the liner and the propellant, variation in cure times can impact diffusion rates. The complexity of case bond liner systems has increased over time, and with it, the number of variables. As more than one variable operates near its specification limit, the potential for failure becomes statistically significant. It is recommended that, in the present system, studies be directed toward refining the process variables further with the goal of increasing the reliability of bonds at all interfaces between layers.

Subject Categories:

  • Solid Propellant Rocket Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE