Journal
ADVANCES IN APPLIED CERAMICS
Volume 115, Issue 5, Pages 308-312Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1743676115Y.0000000068
Keywords
Ultrahigh temperature ceramics; Spark plasma sintering; Mechanical properties; Structural applications
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Funding
- Science Foundation of Xiamen University of Technology [YKJ13009R, XYK201408]
- Science and Technology Project of Xiamen City [3502Z20143036]
- NSFC [51402248]
- Project for the Education Department of Fujian Province [JA14236]
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ZrB2 based composites containing 10 vol.-% carbon nanotubes (CNTs) are synthesised by spark plasma sintering at temperatures ranging from 1600 to 1800 degrees C and at an applied pressure of 25 MPa. The effects of sintering temperature on densification behaviour, microstructural evolutions and mechanical properties are presented. Results indicate that ZrB2-CNT composites fabricated at 1650 degrees C have the optimal combination of dense microstructure and properties. The fracture toughness is sensitive to the temperature change and reaches 7.2 MPa m(1/2) for the CNT toughened ZrB2 ceramics, which is higher than the measured result for monolithic ZrB2 (3.3 MPa m(1/2)). The crack deflection and CNT pullout are the dominant toughening mechanisms.
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