Mechanistic Analysis of Time-Dependent Failure of Oxynitride Glass-Joined Silicon Nitride below 1000oC

Autor:	Dennis N. Coon, Michael H. O'Brien
Rok vydání:	1991
Předmět:	Auger electron spectroscopy Materials science Metallurgy Nitride chemistry.chemical_compound Devitrification Silicon nitride chemistry Creep Cavitation visual_art Service life Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material
Zdroj:	Journal of the American Ceramic Society. 74:103-108
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1991.tb07304.x
Popis:	Time-dependent failure at elevated temperatures currently governs the service life of oxynitride glass-joined silicon nitride. Creep, devitrification, stress-aided oxidation-controlled slow crack growth, and viscous cavitation-controlled failure are examined as possible controlling mechanisms. Creep deformation failure is observed above 1000°C. Fractographic evidence indicates cavity formation and growth below 1000°C. Auger electron spectroscopy verified that the oxidation rate. Time-to-failure is independent of oxygen concentration. Reasonable agreement is found between the observed time-to-failure data and those predicted using the Tsai and Raj, and Raj and Dang viscous cavitation models. It is concluded that viscous relaxation and isolated cavity growth control the rate of failure in oxynitride glassfilled silicon nitride joints below 1000°C. Several possible methods are also proposed for increasing the service lives of these joints.
Databáze:	OpenAIRE
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