INVESTIGATION OF BONDING IN OXIDE-FIBER (WHISKER) REINFORCED METALS.
Abstract
In a continued study of the effects of wetting, bonding and interfacial reactions in the system Ni-alloy/Al2O3 (sapphire), the emphasis was placed on the influence of interfacial reactions on the strength of the underlying sapphire. This aspect is of prime importance in the development of high-strength reinforced composites with nickel matrices. High-strength flame-polished sapphire rods were prepared and used to assess quantitatively the effects of surface interactions with Ni-alloys on the strength of sapphire. Severe surface degradation was observed and resulted in relatively low measured strength; similar effects were also observed qualitatively on sapphire whiskers. The need for a protective coating to preserve the surface (and hence the strength) of sapphire filaments was thus indicated. Some studies of possible 'barrier' coatings for use in this application were initiated. Preliminary work was conducted on W, HfC and TiC coatings. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 18, 1968
- Accession Number
- AD0669654
Entities
People
- M. J. Noone
- W. H. Sutton
Organizations
- General Electric