Effect of a Weak Fiber Interface Coating in ZrB2 Resuborced with Long SiC Fibers
This study reports the microstructural analysis and mechanical properties of a ZrB2 ceramic containing long BN-coated Hi-Nicalon SiC fibers. A composite was produced and thoroughly characterized by transmission electron microscopy to study the interfaces at the nanoscale level. Full densification was accomplished by hot pressing at 1450⁰C. The fiber in the sintered material retained its pristine aspect, confirming that the coating was effective in preventing degradation due to interactions with the matrix. Pull-out was observed on fractured surfaces, but toughness values were about 4.5MPam, which was comparable to those of ZrB2 materials with SiC additions in the form of particles or short fibers. However, the composites exhibited a controlled fracture behavior, as confirmed by a notably higher work of fracture, 140J/m2, compared with 20-30J/m2 of unresuborced ZrB2 or ZrB2 containing chopped fibers.
L. Silvestroni et al., "Effect of a Weak Fiber Interface Coating in ZrB2 Resuborced with Long SiC Fibers," Materials and Design, vol. 88, pp. 610-618, Elsevier Ltd, Dec 2015.
The definitive version is available at http://dx.doi.org/10.1016/j.matdes.2015.08.105
Materials Science and Engineering
Keywords and Phrases
Ceramic-matrix composites (CMCs); Fibers; Fracture toughness; Transmission electron microscopy; ZrB2; Ceramic materials; Coatings; Electron microscopy; Fracture mechanics; High resolution transmission electron microscopy; Hot pressing; Resuborced plastics; Silicon carbide; Sintering
International Standard Serial Number (ISSN)
Article - Journal
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