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This paper describes the influence of sodium-containing contaminants on the corrosion of Si(3)N(4) in a combustion exhaust gas. The ceramic, containing 9 % (by weight) Y(2)O(3), was exposed to the salt-contaminated gas in a low-velocity burner rig in the temperature range 800 C to 1300 C. Below 1000 C, the compound Na(2)SO(4) was deposited continuously on specimen surfaces throughout exposure. Nevertheless, a protective silicon-rich oxide surface scale was formed. No deposition occurred at temperatures above 1000 C, where sodium played a more active role in the corrosion process. Specific aspects of the test methodology are addressed and the results of burner rig corrosion tests are presented.

Additional information

Authors: BAXTER D J, JRC Petten (NL)
Bibliographic Reference: Paper presented: Corrosion of Advanced Ceramics : Measurement and Modelling, Tübingen (DE), August 30 - September 3, 1993
Availability: Available from (1) as Paper EN 37828 ORA
Record Number: 199311285 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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