Accession Number : AD0649509

Title :   DEVELOPMENT OF FILAMENT-REINFORCED METALS.

Descriptive Note : Final rept., 24 Jun 65-24 Dec 66,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OHIO COLUMBUS LABS

Personal Author(s) : Niesz,Dale E. ; Kistler,Charles W. , Jr. ; Fleck,James N.

Report Date : 16 JAN 1967

Pagination or Media Count : 95

Abstract : An investigation was conducted to develop filament-reinforced metals for use at elevated temperatures. The use of carbon filaments to reinforce nickel, cobalt, aluminum and platinum, and the use of silicon carbide filaments to reinforce aluminum and nickel were considered. Uniform microstructures were obtained by fabricating composites from metal-coated filaments where the coating becomes the matrix of the composite. Of the coating techniques investigated, electroless deposition was found to be the most suitable for obtaining uniform coatings on the individual filaments of Thornel yarn. Although the phosphorus content of nickel obtained from conventional electroless-nickel plating baths made this material useless as a matrix, conventional electroless-cobalt produced an attractive matrix material. Phosphorus-free nickel and platinum coatings of relatively high purity were obtained by electroless deposition using hydrazine as a reducing agent. These materials are attractive matrices. Cobalt-Thornel composites were fabricated by swaging and hot isostatically compacting cobalt-coated Thornel filaments. The microstructural stability of these composites at 1800 F was excellent, but their oxidation behavior was erratic. The maximum tensile strength attained in room temperature measurements was approximately 50 percent of the theoretical strength, as calculated using a continuous-filament model, and was attained for a filament content of approximately 50 volume percent. The tensile strengths at 1400 and 1800 F were also low. These low strengths were attributed to the low aspect ratio of the filaments due to breakup during fabrication. (Author)

Descriptors :   (*COMPOSITE MATERIALS, *HEAT RESISTANT MATERIALS), (*REINFORCING MATERIALS, *FILAMENTS), (*CARBON FIBERS, COMPOSITE MATERIALS), (*SILICON CARBIDES, WHISKERS(CRYSTALS)), (*WHISKERS(CRYSTALS), COMPOSITE MATERIALS), NICKEL, COBALT, ALUMINUM, PLATINUM, MECHANICAL PROPERTIES, MICROSTRUCTURE, METAL COATINGS, ELECTROLESS PLATING, OXIDATION, TENSILE PROPERTIES, MODULUS OF ELASTICITY

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE