Resin/Graphite Fiber Composites.
Abstract
During the course of the program, techniques were developed that provided thermo-oxidatively stable A-type polyimide/graphite fiber composites using the novel approach of in situ polymerization of monomeric reactants directly on reinforcing fibers, rather than employing separately prepared prepolymer varnish. This was accomplished by simply mixing methylene dianiline and two ester-acids and applying this solution to the fibers for subsequent molding. Five different formulated molecular weight resins were examined, and an optimized die molding procedure established for the 1500 formulated molecular weight system. Extensive ultrasonic inspection of composites was successfully utilized as a technique for monitoring laminate quality. Composite mechanical property studies were conducted with this polyimide resin at room temperature and after various time exposures in a thermo-oxidative environment at 561K (550F), 589K (600F) and 6l7K (650F). It was determined that such composites have a long term life in the temperature range of 561K to 585K. The final phase involved the fabrication and evaluation of a series of demonstration airfoil specimens. (AN)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 15, 1974
- Accession Number
- ADA305012
Entities
People
- P. J. Cavano