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 language | English |
|---|---|
| Pages (from-to) | 3123-3125 |
| Number of pages | 3 |
| Journal | Journal of the American Ceramic Society |
| Volume | 85 |
| Issue number | 12 |
| Publication status | Published - 2002 Dec 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Ceramics and Composites
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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 journal › Article
}
TY - JOUR
T1 - Effect of oxidation on mechanical properties of fibrous monolith Si3N4/BN at elevated temperatures in air
AU - Koh, Young-Hag
AU - Kim, Hae Won
AU - Kim, Hyoun Ee
AU - Halloran, John W.
PY - 2002/12/1
Y1 - 2002/12/1
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=0036970065&partnerID=8YFLogxK
M3 - Article
VL - 85
SP - 3123
EP - 3125
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 12
ER -