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

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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)417-420
Number of pages4
JournalJournal of the American Ceramic Society
Volume87
Issue number3
DOIs
StatePublished - Mar 2004

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