MACROLAMINATE PARTICLE COMPOSITE MATERIAL DEVELOPMENT.
Summary rept., 1 Jun 65-1 Jul 66.
BOEING CO SEATTLE WASH AEROSPACE GROUP
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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 mgsq cm and 8 mgsq cm after 100 hour exposure at 2000 and 2400F, respectively, which is 15 that of TD nickel.
- Ceramics, Refractories and Glass
- Laminates and Composite Materials
- Fabrication Metallurgy