Accession Number : AD0637573

Title :   MACROLAMINATE PARTICLE COMPOSITE MATERIAL DEVELOPMENT.

Descriptive Note : Summary rept., 1 Jun 65-1 Jul 66.

Corporate Author : BOEING CO SEATTLE WASH AEROSPACE GROUP

Personal Author(s) : Simpson,F. H.

Report Date : JUL 1966

Pagination or Media Count : 74

Abstract : Nickel-alumina was used as a model system to demonstrate the validity of the Knapp-Shanley concept for combining ductile and brittle materials into composites exhibiting stress relief capability not obtainable in the brittle material alone while achieving improved specific strength and stiffness characteristics not available in the metal. Ni-Al2O3 composites having 3 times the specific strength and 1.5 times the specific stiffness of nickel and impact strength 3 to 5 times that of alumina were produced. These composites retained from 60 to 90 percent of their strength when water quenched from 2000F; alumina cracked and had no strength retention after the same quenching. At 2000F the nickel has essentially zero strength while NiAl2O3 composites maintained a flexural yield strength in excess of 20 ksi. Substitution of higher strength nickel alloys for pure nickel produced significant improvements in the properties of the composite. Flexural strength of 32 ksi at 2000F and 16 ksi at 2400F were obtained in a (Ni . 2ThO2) 13Cr - Al2O3 laminate particle composite. This composite gained 2 mg/sq cm and 8 mg/sq cm after 100 hour exposure at 2000 and 2400F, respectively, which is 1/5 that of TD nickel.

Descriptors :   (*COMPOSITE MATERIALS, LAMINATES), PARTICLES, POWDER METALLURGY, CERMETS, HOT WORKING, NICKEL ALLOYS, ALUMINUM COMPOUNDS, OXIDES, DUCTILITY, BRITTLENESS, METAL COATINGS, NICKEL, FLEXURAL STRENGTH, THORIUM COMPOUNDS, CHROMIUM ALLOYS, SHOCK RESISTANCE

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE