Effect of oxidation on mechanical properties of fibrous monolith Si3N4/BN at elevated temperatures in air

Young-Hag Koh, Hae Won Kim, Hyoun Ee Kim, John W. Halloran

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The oxidation behavior and its effect on the mechanical properties of fibrous monolith Si3N4/BN after exposure to air at temperatures ranging from 1000° to 1400°C for up to 20 h were investigated. After exposure at 1000°C, only the BN cell boundary was oxidized, forming a B2O3 liquid phase. With increasing exposure temperature, the Si3N4 cells began to oxidize, forming crystalline Y2Si2O7, SiO2, and silicate glass. However, in this case, a weight loss was observed due to extensive vaporization of the B2O3 liquid. After exposure at 1400°C, large Y2Si2O7 crystals with a glassy phase formed near the BN cell boundaries. The oxidation behavior significantly affected the mechanical properties of the fibrous monolith. The flexural strength and work-of-fracture decreased with increasing exposure temperature, while the noncatastrophic failure was maintained.

Original languageEnglish
Pages (from-to)3123-3125
Number of pages3
JournalJournal of the American Ceramic Society
Volume85
Issue number12
Publication statusPublished - 2002 Dec 1
Externally publishedYes

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mechanical property
oxidation
Oxidation
Mechanical properties
air
Air
Silicates
temperature
Liquids
Vaporization
Bending strength
Temperature
liquid
vaporization
Crystalline materials
Glass
Crystals
silicate
glass
silicon nitride

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Effect of oxidation on mechanical properties of fibrous monolith Si3N4/BN at elevated temperatures in air. / Koh, Young-Hag; Kim, Hae Won; Kim, Hyoun Ee; Halloran, John W.

In: Journal of the American Ceramic Society, Vol. 85, No. 12, 01.12.2002, p. 3123-3125.

Research output: Contribution to journalArticle

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