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