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

Personal Author(s) : Freiman, S W ; White, G S ; Baker, T L ; Wiederhorn, S M ; Coyle, T D

PDF Url : ADA190501

Report Date : Nov 1987

Pagination or Media Count : 64

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 (LEC)/GaAs 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.

Descriptors :   *CERAMIC MATERIALS, *STRESS CORROSION, AMMONIA, CAPACITORS, CARBINOLS, CRACK PROPAGATION, CRACKS, CRYSTALS, CZOCHRALSKI CRYSTALS, DETECTION, DYNAMICS, ENCAPSULATION, FATIGUE, FRACTURE(MECHANICS), GALLIUM ARSENIDES, LIQUIDS, METHODOLOGY, MICROSTRUCTURE, NONDESTRUCTIVE TESTING, TOPOGRAPHY, TOUGHNESS, WATER, X RAYS, SINGLE CRYSTALS, GLASS, WAFERS, FERROELECTRIC MATERIALS, BARIUM TITANATES, LEAD TITANATES

Subject Categories : Ceramics, Refractories and Glass
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE