Sol-gel alumina coating for improved cyclic oxidation resistance of silicon nitride

Irina Tsarenko, Sang Park, Honghua Du, Woo Y. Lee

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A 25 nm thick α-alumina layer was deposited on a turbine-grade silicon nitride by sol-gel dip coating and subsequent heat treatment in air at 1200°C. This layer had a nanometer grain structure. Silicon nitride protected by this thin layer showed a significant improvement in oxidation resistance over its uncoated counterpart after 200 cyclic exposures in air at 1250°C. The oxide layer grown on the coated silicon nitride also exhibited superior surface morphology, compared with the uncoated silicon nitride.

Original languageEnglish
Pages (from-to)1622-1624
Number of pages3
JournalJournal of the American Ceramic Society
Volume86
Issue number9
DOIs
StatePublished - Sep 2003

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