Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 3, Pages 4819-4826Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.09.031
Keywords
Whiskers; Mechanical properties; Fibers; ZrB2; Microstructure
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ZrB2-based composites were toughened by the simultaneous additions of SiC chopped fibers and SiC whiskers. The fracture toughness measured by Chevron Notched Beam in flexure was of the order of 6 MPa m(1/2) and the 4-pt flexural strength around 500 MPa. The values of mechanical properties are compared to those of unreinforced ZrB2 and composites reinforced by solely fibers or whiskers in order to understand whether a synergistic whiskers-fibers toughening action is present or not in these composites. The combination of two different reinforcing agents is a successful strategy to obtain a super reinforcement provided that densification, reinforcing agents chemical integrity and secondary phases composition and amount are properly controlled. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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