Accession Number : AD0615817

Title :   INVESTIGATION OF BONDING IN OXIDE-FIBER (WHISKER) REINFORCED METALS.

Descriptive Note : Quarterly rept. no. 2, 1 Oct-31 Dec 64,

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s) : Sutton,Willard H. ; Feingold,Earl

Report Date : MAR 1965

Pagination or Media Count : 32

Abstract : The character of wetting and bonding between single crystal sapphire (alpha-Al2O3) and sessile drops of nickel doped with 1 atomic percent of chromium, titanium or zirconium was studied. Bonding in these systems was found to proceed in the following manner: (a) segregation of the active metal, (b) concentration of the active metal at the interface, (c) reaction of active metal with the sapphire substrate, (d) formation of new crystalling phases at the interface, with (e) diffusion of the active metal into the sapphire. Detailed investigations of metal/sapphire interfaces were conducted using the methods of x-ray diffraction optical and electron microscopy and microhardness. An hypothesis for the mode of bond failure relating to the nature of the underlying sapphire surface is presented. Differences between true interfacial bonding and 'engineering bonding' were noted and are described. (Author)

Descriptors :   (*COMPOSITE MATERIALS, BONDING), (*CERAMIC FIBERS, REINFORCING MATERIALS), (*REINFORCING MATERIALS, CERAMIC FIBERS), NICKEL, SAPPHIRE, SINGLE CRYSTALS, SURFACE ACTIVE SUBSTANCES, ALUMINUM COMPOUNDS, OXIDES, FIBER METALLURGY, CHROMIUM ALLOYS, TITANIUM ALLOYS, ZIRCONIUM ALLOYS, NICKEL ALLOYS, SURFACE PROPERTIES, ELECTRON MICROSCOPY, MICROSCOPY, X RAY SPECTROSCOPY, X RAY DIFFRACTION, DEGRADATION, MICROSTRUCTURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE