Accession Number : ADA302240

Title :   Research on Graphite Reinforced Glass Matrix Composites.

Descriptive Note : Annual rept.,

Corporate Author : UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CT

Personal Author(s) : Bacon, J. F. ; Prewo, K. M.

PDF Url : ADA302240

Report Date : JUN 1977

Pagination or Media Count : 121

Abstract : This report contains the results obtained in the first twelve months of research under NASA Langley Contract NASl-l4346 for the origination of graphite-fiber reinforced glass matrix composites. Included in the report is a summary of the research by other investigators in this area. The method selected to form the composites consisted of pulling the graphite fiber through a slurry containing powdered glass, winding up the graphite fiber and the glass it picks up on a drum, drying, cutting into segments, loading the tape segment into a graphite die, and hot pressing. During the course of the work, composites were made with a variety of graphite fibers in a C.G.W. 7740 (Pyrex) glass matrix. The graphite fibers used included Hercules HMS, Hercules HTS, Thornel 300S, and Celanese DG-102 and, of these, the Hercules HMS and Celanese DG-102 graphite fibers in C.G.W. 774O gave the most interesting but widely different results. Hercules HMS fiber in C.G.W. 7740 glass (Pyrex) showed an average four-point flexural strength of 848 MPa or l27,300 psi. As the test temperature was raised from room temperature to 560 deg c in argon or vacuum, the strength was higher by 50%. However, in air similar tests at 560 C gave a severe loss in strength. These composites also have good thermal cycle properties in argon or vacuum, greatly increased toughness compared to glass, and no loss in strength in a 100 cycle fatigue test. Celanese DG-102 fiber in C.G.W. 7740 glass (Pyrex) had a much lower flexural strength but did not suffer any loss in this strength when samples were heated to 560 C in air for 4 hrs.

Descriptors :   *FIBER REINFORCED COMPOSITES, *GRAPHITE, *HEAT RESISTANT GLASS, THERMAL PROPERTIES, ALUMINUM ALLOYS, POWDERS, MODULUS OF ELASTICITY, HOT PRESSING, CARBON FIBERS, TOUGHNESS, MATRIX MATERIALS, GLASS, BENDING, FRACTURE(MECHANICS), SLURRIES, FUSED SILICA, FLEXURAL STRENGTH, EPOXY COMPOSITES, ARGON, THERMAL CYCLING TESTS, THERMAL STRESSES, FATIGUE TESTS(MECHANICS), DRYING, CYCLIC TESTS, WINDING.

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE