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

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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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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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