ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The oxidative durability of a SiC-SiC composite with Hi-Nicalon fiber and a BN interphase was investigated at 800°C (where pesting is known to occur in SiC-SiC composites) for exposure durations of up to 500 h and in a variety of oxidant mixes and flow rates, ranging from quasi-stagnant room air, through slow-flowing oxygen that contained 30%-90% H2O, to the high-velocity flame of a burner rig. Degradation of the composite was determined from residual strength and fracture stain in post-exposure mechanical tests and correlated with microstructural evidence of damage to the fiber and interphase. The most-severe degradation of composite behavior occurred in the burner rig and has been shown to be associated with the high oxidant velocity and substantial moisture content, as well as a thin sublayer of carbon that is indicated to form between the fiber and the interphase during composite processing.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.1998.tb02696.x
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