EFFECTS OF STEAM ENVIRONMENT ON CREEP BEHAVIOUR OF NEXTEL720/ALUMINA-MULLITE CERAMIC COMPOSITE AT ELEVATED TEMPERATURE

The tensile creep behaviour of an oxide-oxide continuous fibre ceramic composite was investigated at 1000 and 1100 C in laboratory air and in steam. The composite consisted of a porous alumina-mullite matrix reinforced with laminated, woven mullite/alumina (Nextel720) fibres, had no interface betwee...

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Bibliographic Details
Published in:Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2010-01, Vol.41 (12), p.1807-1816
Main Authors: Ruggles-Wrenn, M B, Kutsal, T
Format: Article
Language:English
Subjects:
Ceramics
Creep (materials)
Creep rate
Degradation
Fibre
Stress-strain relationships
Tensile creep
Tensile properties
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Summary:The tensile creep behaviour of an oxide-oxide continuous fibre ceramic composite was investigated at 1000 and 1100 C in laboratory air and in steam. The composite consisted of a porous alumina-mullite matrix reinforced with laminated, woven mullite/alumina (Nextel720) fibres, had no interface between the fibre and matrix, and relied on the porous matrix for flaw tolerance. The tensile stress-strain behaviour was investigated and the tensile properties measured. Tensile creep behaviour was examined for creep stresses in the 70-140 MPa range. The presence of steam accelerated creep rates and dramatically reduced creep lifetimes. The degrading effects of steam became more pronounced with increasing temperature. At 1000 C, creep run-out (set to 100 h) was achieved in all tests. At 1100 C, creep run-out was achieved in all tests in air and only in the 87.5 MPa test in steam. Composite microstructure and damage and failure mechanisms were investigated.
ISSN:1359-835X