Oxidation behavior and effect of oxidation on strength of Si3N4/SiC nanocomposites

Hae Won Kim; Young Hag Koh; Hyoun Ee Kim

doi:10.1557/JMR.2000.0212

Oxidation behavior and effect of oxidation on strength of Si₃N₄/SiC nanocomposites

Hae Won Kim, Young Hag Koh, Hyoun Ee Kim

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

The oxidation behavior and the effect of oxidation on the flexural strength of Si₃N₄/SiC nanocomposites were investigated. Parabolic weight gains, with respect to the oxidation time, were observed for all the specimens containing different amounts of SiC. However, the parabolic rate constant decreased with increasing SiC content. The main oxidation product, being in equilibrium with SiO₂, was Y₂Si₂O₇. The oxidation product became denser and retained more crystalline phase as the amount of SiC increased. The flexural strength of the nanocomposites increased by up to 40%, while that of pure Si₃N₄ decreased after oxidation at 1300 or 1400 °C for 100 h. This excellent oxidation resistance of Si₃N₄ nanocomposite was attributed to the enhancement of the crystallization of the oxidation product and the grain boundary phase by the SiC nanoparticles.

Original language	English
Pages (from-to)	1478-1482
Number of pages	5
Journal	Journal of Materials Research
Volume	15
Issue number	7
DOIs	https://doi.org/10.1557/JMR.2000.0212
Publication status	Published - 2000 Jul
Externally published	Yes

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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abstract = "The oxidation behavior and the effect of oxidation on the flexural strength of Si3N4/SiC nanocomposites were investigated. Parabolic weight gains, with respect to the oxidation time, were observed for all the specimens containing different amounts of SiC. However, the parabolic rate constant decreased with increasing SiC content. The main oxidation product, being in equilibrium with SiO2, was Y2Si2O7. The oxidation product became denser and retained more crystalline phase as the amount of SiC increased. The flexural strength of the nanocomposites increased by up to 40%, while that of pure Si3N4 decreased after oxidation at 1300 or 1400 °C for 100 h. This excellent oxidation resistance of Si3N4 nanocomposite was attributed to the enhancement of the crystallization of the oxidation product and the grain boundary phase by the SiC nanoparticles.",

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AU - Kim, Hae Won

AU - Koh, Young Hag

AU - Kim, Hyoun Ee

PY - 2000/7

Y1 - 2000/7

N2 - The oxidation behavior and the effect of oxidation on the flexural strength of Si3N4/SiC nanocomposites were investigated. Parabolic weight gains, with respect to the oxidation time, were observed for all the specimens containing different amounts of SiC. However, the parabolic rate constant decreased with increasing SiC content. The main oxidation product, being in equilibrium with SiO2, was Y2Si2O7. The oxidation product became denser and retained more crystalline phase as the amount of SiC increased. The flexural strength of the nanocomposites increased by up to 40%, while that of pure Si3N4 decreased after oxidation at 1300 or 1400 °C for 100 h. This excellent oxidation resistance of Si3N4 nanocomposite was attributed to the enhancement of the crystallization of the oxidation product and the grain boundary phase by the SiC nanoparticles.

AB - The oxidation behavior and the effect of oxidation on the flexural strength of Si3N4/SiC nanocomposites were investigated. Parabolic weight gains, with respect to the oxidation time, were observed for all the specimens containing different amounts of SiC. However, the parabolic rate constant decreased with increasing SiC content. The main oxidation product, being in equilibrium with SiO2, was Y2Si2O7. The oxidation product became denser and retained more crystalline phase as the amount of SiC increased. The flexural strength of the nanocomposites increased by up to 40%, while that of pure Si3N4 decreased after oxidation at 1300 or 1400 °C for 100 h. This excellent oxidation resistance of Si3N4 nanocomposite was attributed to the enhancement of the crystallization of the oxidation product and the grain boundary phase by the SiC nanoparticles.

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Oxidation behavior and effect of oxidation on strength of Si₃N₄/SiC nanocomposites

Abstract

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