Final rept. Nov 1981-Feb 1984
AIR FORCE ROCKET PROPULSION LAB EDWARDSAFB CA
Pagination or Media Count:
Ablative materials protect aerodynamic surfaces, propulsion structures, and ground equipment from the very high temperatures and the velocity of the gases in the exhaust. This paper describes current efforts to evaluate an ablative coating based on a low-cost polymer and a low-cost filler. The objective was to develop a low-cost, ablativeinsulating material for routine application to protect costly test facilities. Experiments were conducted at the AFRPL using the standard 15-pound Ballistic Test and Evaluation System BATES solid propellant rocket motors containing aluminized propellants. This type of propellant produces an erosive exhaust gas which is the best condition for evaluating the ablative coating formulations. Other motors were also used for evaluation purposes, such as Peacekeeper Stages I, II, and III Short-Length Super High Internal Pressure-Producing Orifice HIPPO Super BATES and the STS-5 Space Shuttle launch. Ablative samples were tested, evaluated, and compared to commercially available ablative materials under the same conditions. It was found that the low-cost ablativeinsulating materials withstood the high temperature exhaust as well as, or better than, the commercially available ablative products. Using the best candidate, the Low-Cost Insulator in the one-gallon mix, cost approximately 13.00 compared to 147.00 for the same amount of the commercially available ablative material. The AFRPL ablative material can be processed in the field for easy application and the material cures at ambient temperature.
- Miscellaneous Materials
- Solid Propellant Rocket Engines