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  • Composite Materials  (3)
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  • 1
    facet.materialart.
    Unknown
    An Insidious Mode of Oxidative Degradation in a SiC-SiC Composite (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The oxidative durability of a SiC-SiC composite with Hi-Nicalon fiber and BN interphase was investigated at 800 C (where pesting is known to occur in SiC-SiC composites) for exposure durations of up to 500 hours and in a variety of oxidant mixes and flow rates, ranging from quasi-stagnant room air, through slow flowing O2 containing 30-90% H2O, to the high-velocity flame of a burner rig. Degradation of the composite was determined from residual strength and fracture strain in post-exposure mechanical tests and correlated with microstructural evidence of damage to fiber and interphase. The severest degradation of composite behavior was found to occur in the bumer rig, and is shown to be connected with the high oxidant velocity and substantial moisture content, as well as a thin sublayer of carbon indicated to form between fiber and interphase during composite processing.
    Keywords: Composite Materials
    Type: Journal of the American Ceramic Society
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Recent Developments in the Environmental Durability of Sic/sic Composites (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two types of pest behavior in SiC/BN/SiC composites are distinguished and illustrated: one intrinsic and progressive, the other extrinsic and catastrophic. Their similarities and differences are presented. Some recent remedies for SiC/BN/SiC pest are discussed.
    Keywords: Composite Materials
    Type: NASA/CR-2002-211687 , NAS 1.26:211687 , E-13416 , CIMTEC 2002 International Conferences on Modern Materials and Technologies; Jul 14, 2002 - Jul 19, 2002; Florence; Italy
    Format: application/pdf
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  • 3
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    Unknown
    Pest Oxidation Regime in the Hi-Nicalon(Trademark)/BN/SiC Composite (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: SiC-SiC composites are prone to pest degradation at intermediate temperatures where the formation of a protective scale of silica by direct oxidation of SiC is too slow to offer effective protection from attack by ambient gases. The attack results in the removal of the BN interphase and its replacement by a borosilicate liquid (which dissolves and weakens the fiber) and finally by SiO2, (which embrittles the composite by bonding fiber to fiber or to matrix). This paper reports a study aimed at mapping out the temperature range of such pest degradation and the severity of its effect.
    Keywords: Composite Materials
    Type: CIMTEC-9: World Ceramic Congress 1998; Jun 14, 1998 - Jun 19, 1998; Florence; Italy
    Format: text
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