INVESTIGATION OF BONDING IN OXIDE-FIBER (WHISKER) REINFORCED METALS.
Progress rept. no. 5, 18 Apr 67-18 Apr 68,
GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV
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In a continued study of the effects of wetting, bonding and interfacial reactions in the system Ni-alloyAl2O3 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
- Laminates and Composite Materials