Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si3N4

Irina Tsarenko; Henry H. Du; Woo Y. Lee

doi:10.1111/j.1551-2916.2004.00417.x

Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si₃N₄

Irina Tsarenko
, Henry H. Du
, Woo Y. Lee

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

15 Scopus citations

Abstract

We investigated the effects of a chemically-vapor-deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si₃N ₄ in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si₃N₄ during isothermal oxidation in air at 1400°C, leading to significantly reduced TGO growth as well as markedly improved TGO morphology. This improvement can be attributed to the refractory and viscous nature of the SiO ₂-Al₂O₃ system, compared with SiO₂, when under the influence of alkali and/or alkaline-earth fluxing elements. However, the mullite coating had little effect on the stability of the ceramic in the steam environment at 1200°C, due likely to high activity of SiO ₂ in mullite.

Original language	English
Pages (from-to)	417-420
Number of pages	4
Journal	Journal of the American Ceramic Society
Volume	87
Issue number	3
DOIs	https://doi.org/10.1111/j.1551-2916.2004.00417.x
State	Published - Mar 2004

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title = "Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si3N4",

abstract = "We investigated the effects of a chemically-vapor-deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si3N 4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si3N4 during isothermal oxidation in air at 1400°C, leading to significantly reduced TGO growth as well as markedly improved TGO morphology. This improvement can be attributed to the refractory and viscous nature of the SiO 2-Al2O3 system, compared with SiO2, when under the influence of alkali and/or alkaline-earth fluxing elements. However, the mullite coating had little effect on the stability of the ceramic in the steam environment at 1200°C, due likely to high activity of SiO 2 in mullite.",

author = "Irina Tsarenko and Du, \{Henry H.\} and Lee, \{Woo Y.\}",

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AU - Tsarenko, Irina

AU - Du, Henry H.

AU - Lee, Woo Y.

PY - 2004/3

Y1 - 2004/3

N2 - We investigated the effects of a chemically-vapor-deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si3N 4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si3N4 during isothermal oxidation in air at 1400°C, leading to significantly reduced TGO growth as well as markedly improved TGO morphology. This improvement can be attributed to the refractory and viscous nature of the SiO 2-Al2O3 system, compared with SiO2, when under the influence of alkali and/or alkaline-earth fluxing elements. However, the mullite coating had little effect on the stability of the ceramic in the steam environment at 1200°C, due likely to high activity of SiO 2 in mullite.

AB - We investigated the effects of a chemically-vapor-deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si3N 4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si3N4 during isothermal oxidation in air at 1400°C, leading to significantly reduced TGO growth as well as markedly improved TGO morphology. This improvement can be attributed to the refractory and viscous nature of the SiO 2-Al2O3 system, compared with SiO2, when under the influence of alkali and/or alkaline-earth fluxing elements. However, the mullite coating had little effect on the stability of the ceramic in the steam environment at 1200°C, due likely to high activity of SiO 2 in mullite.

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UR - https://www.scopus.com/pages/publications/1842686817#tab=citedBy

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DO - 10.1111/j.1551-2916.2004.00417.x

M3 - Article

AN - SCOPUS:1842686817

SN - 0002-7820

VL - 87

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EP - 420

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 3

ER -

Effects of Thin Mullite Coating on the Environmental Stability of Sintered Si₃N₄

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