Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 11, Pages 8411-8417Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.03.188
Keywords
ZrB2; SiC; Carbon black; Hot pressing; Microstructure; Mechanical properties
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Funding
- Islamic Azad University, Quchan Branch, Iran
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The effect of nano-sized carbon black on densification behavior, microstructure, and mechanical properties of zirconium diboride (ZrB2) - silicon carbide (SiC) ceramic was studied. A ZrB2-based ceramic matrix composite, reinforced with 20 vol% SiC and doped with 10 vol% nano-sized carbon black, was hot pressed at 1850 degrees C for 1 h under 20 MPa. For comparison, a monolithic ZrB2 ceramic and a ZrB2-20 vol% SiC composite were also fabricated by the same processing conditions. By adding 20 vol% SiC, the sintered density slightly improved to similar to 93%, compared to the relative density of similar to 90% of the monolithic one. However, adding 10 vol% nano-sized carbon black to ZrB2-20 vol% SiC composite meaningfully increased the sinterability, as a relatively fully dense sample was obtained (RD=similar to 100%). The average grain size of sintered ZrB2 was significantly affected and controlled by adding carbon black together with SiC acting as effective grain growth inhibitors. The Vickers hardness, flexural strength and fracture toughness of SiC reinforced and carbon black doped composites were found to be remarkably higher than those of monolithic ZrB2 ceramic. Moreover, unreacted carbon black additives in the composite sample resulted in the activation of some toughening mechanisms such as crack deflections.
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