Strong and tough Hi-Nicalon-fiber-reinforced celsian-matrix composites
Journal Article
·
· Journal of the American Ceramic Society
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
Strong, tough, and almost fully dense BN/SiC-coated Hi-Nicalon-fiber-reinforced celsian-matrix composites have been fabricated by impregnation of the fiber tows with the matrix slurry, winding on a drum, stacking the prepreg tapes in the desired orientation, and hot pressing. The monoclinic celsian phase in the matrix was produced in situ, during hot pressing, from a mixed oxide precursor. The unidirectional composites having {approx}42 vol% of fibers exhibited graceful failure with extensive fiber pullout in three-point bend tests at room temperature. Values of stress and strain at the proportional limit were 435 {+-} 35 MPa and 0.27 {+-} 0.01%, respectively, and an apparent ultimate strength of 900 {+-} 60 MPa was observed. Young`s modulus of the composites was 165 {+-} 5 GPa.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 554025
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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