Accession Number:

ADA190501

Title:

Stress Corrosion of Ceramic Materials.

Descriptive Note:

Annual rept. 1 Oct 85-30 Sep 86,

Corporate Author:

NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD CERAMICS DIV

Report Date:

1987-11-01

Pagination or Media Count:

64.0

Abstract:

Environmentally enhanced crack growth data was obtained on Gallium Arsenide in water and methanol. No effect of ammonia was observed. Strains in the liquid encapsulated Czochralski LECGaAs crystals were mapped using x-ray topography. Critical fracture toughness and dynamic fatigue data were obtained on capacitor ceramics of varying composition and microstructure. A wide range of values for KIC and crack growth exponent, N, were observed. Collaborative work with Draper Labs and North American Phillips was performed in an effort to develop a non-destructive crack detection procedure.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE