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This paper investigates the influence of a simulated coal gasification environment on the mechanical properties of a commercial hot pressed silicon nitride. In a first approach sequential interaction testing is used, in which high temperature mechanical tests are carried out in a vacuum or in an inert environment following pre-exposure to identical corrosion conditions. The results of such experiments show that the rupture times of the pre-exposed material exceed those of the material in the as-received condition. An alternative testing method has also been explored, applying a mechanical load during the exposure to the aggressive environment. In these simultaneous interaction tests, continued straining during mechanical loading may inhibit the formation of a protective scale, and the ingress of the aggressive gas to the bulk of the material may significantly change its mechanical behaviour. A description of the test facility is given and preliminary results are presented.

Additional information

Authors: HOFFMANN M, JRC Petten (NL);STEEN M, JRC Petten (NL);MARTINS C S, CEMUL Instituto Superior Técnico, Lisboa (PT);DANZER R, Montanuniversität Leoben, CD Laboratorium für Hochleistungskeramik am Institut für Struktur- und Funktionskeramik (AT)
Bibliographic Reference: Paper presented: Second International Conference on Ceramics in Energy Applications, London (GB), April 20-21, 1994
Availability: Available from (1) as Paper EN 38216 ORA
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