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:
A series of 50 vol/% unidirectional Nicalon™ fiber/zirconium titanate matrix composites were fabricated by alkoxide infiltration of the fiber tows. The fibers had a thin, amorphous boron nitride coating that was either heavily or lightly bridged. The bridged coatings were a result of localized excess boron nitride deposits and had the effect of binding adjacent fibers at boron nitride nodules during the immersion process. The resultant composites contained matrix-rich ribbons, which exhibited laminate-like mechanical behavior reported previously. Highest strength was obtained when the composites were loaded parallel to the ribbon orientation, and highest toughness (WOF) was obtained when the composites were loaded perpendicular to the ribbons. The ribbon orientation had a more pronounced effect on composite behavior than the presence or lack of bridging boron nitride nodules. However, the bridging nodules altered the relative orientation of the matrix-rich ribbons during fabrication and, thus, the direction of optimal strength or toughness.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.2000.tb01715.x
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