Case to insulation bonding system

Abstract

A metal case to non-metal bonding system that has a long shelf life and will withstand high temperature and pressure operating conditions and that satisfies requirements relating to material compatibility, surface preparation, strength, aging, ease of application and stability over a broad range of temperatures comprises a cylindrical metal case and a non-metallic insulation attached to the interior surface of the case wherein the case interior surface is sand blasted and cleaned, a corrosive resistant coating is applied and cured, a metal to rubber adhesive coating is brush applied and cured, uncured insulation material is laid up against the interior surface of the cured adhesive, several layers of insulation material are used wherein a vacuum bag is used between layers to attach adjacent layers, the uncured insulation, adhesive and metal liner are cured and vulcanized bonded, and the interior surface is machined to final dimensions to receive a solid propellant grain assembly.

What is claimed is: 
     
       1. A method for bonding a non-metal insulation to an interior surface of a metal case, said method comprising the steps of: (a) sand blasting the interior surface of said metal case;   (b) cleaning said sand blasted surface with a solvent;   (c) brush applying a corrosive resistant coating to said cleaned sand blasted surface;   (d) curing said corrosive resistance coating;   (e) brush applying an adhesive coating to said cured corrosive resistant coating;   (f) curing said adhesive coating;   (g) laying-up a first sheet of uncured insulation material against said adhesive coating;   (h) laying up a second sheet of uncured insulation material against said first sheet and attaching said second sheet to said first sheet by applying force thereto;   (i) repeat step (h) until desired insulation thickness is achieved; and   (j) curing said insulation.   
     
     
       2. The bonding system of claim 1 wherein the sand blasted surface of step (a) has a surface roughness not to exceed 125 microinches, and said solvent is methyl ethyl ketone.