Advantages of SiC Hi-Nicalon or NLM 202 Fibers in SiCf-SiBC Composites

SiCf–SiBC composites were produced using NLM 202 and Hi‐Nicalon SiCf fibers. Tensile creep tests were performed under a reduced pressure of argon. These composites show a good creep resistance at 1473 K with a strain rate ranging from 10−9 to 10−7 s−1, depending on the stress level. The creep streng...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2005-07, Vol.88 (7), p.1967-1972
Main Authors: Darzens, Séverine, Chermant, Jean-Louis, Sangleboeuf, Jean-Christophe
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Engineering Sciences
Exact sciences and technology
Materials and structures in mechanics
Materials science
Mechanical engineering
Mechanics
Mechanics of materials
Other materials
Physics
Specific materials
Structural ceramics
Technical ceramics
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Summary:SiCf–SiBC composites were produced using NLM 202 and Hi‐Nicalon SiCf fibers. Tensile creep tests were performed under a reduced pressure of argon. These composites show a good creep resistance at 1473 K with a strain rate ranging from 10−9 to 10−7 s−1, depending on the stress level. The creep strength was improved by using Hi‐Nicalon instead of NLM 202 SiCf fibers, to the extent of increasing the loadability by 50 MPa at the same operating temperature or increasing the temperature by 50 K for the same load. The damage observed in SEM micrographs and the use of the damage mechanics provide evidence that creep is governed by a damage‐creep mechanism in two steps.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2005.00241.x