Durability of YZA ceramic foams in a porous burner

The durability of YZA cellular ceramic foams was investigated in the demanding environment of an instrumented porous burner. Following exposure to the combustion environment, the ceramic foam coupons suffered moderate damage. Coupons exposed to extended duration tests in the burner did not show addi...

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Bibliographic Details
Published in:Journal of materials science 2005, Vol.40 (1), p.155-164
Main Authors: ELVERUM, P. J, ELLZEY, J. L, KOVAR, D
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Cermets, ceramic and refractory composites
Chemical analysis
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Damage
Discount coupons
Durability
Exact sciences and technology
Exposure
Failure
Foams
Materials science
Miscellaneous
Morphology
Other materials
Physics
Specific materials
Technical ceramics
Temperature gradients
Thermal shock
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Description
Summary:The durability of YZA cellular ceramic foams was investigated in the demanding environment of an instrumented porous burner. Following exposure to the combustion environment, the ceramic foam coupons suffered moderate damage. Coupons exposed to extended duration tests in the burner did not show additional damage compared to coupons exposed to short duration tests indicating that damage occurred during start-up, when temperature gradients were most severe. To compare the results of the burner tests to conventional thermal shock experiments, samples were also exposed to a water quench test. Coupons removed from the burners and coupons exposed to the water quench from high temperatures exhibited similar failure morphologies. In both cases a marked transition in failure morphology was observed as the magnitude of the peak temperatures and thermal gradients were increased. Chemical analysis combined with these thermal shock measurements show that damage sustained by the foams in the burner results from thermal shock and not from chemical degradation.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-5701-6