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Materials 2016, 9(12), 967;

ZrB2-CNTs Nanocomposites Fabricated by Spark Plasma Sintering

National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, China
Author to whom correspondence should be addressed.
Academic Editor: It-Meng (Jim) Low
Received: 16 October 2016 / Revised: 18 November 2016 / Accepted: 22 November 2016 / Published: 29 November 2016
(This article belongs to the Special Issue The Failure Micromechanics and Toughening Mechanisms of Materials)
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ZrB2-based nanocomposites with and without carbon nanotubes (CNTs) as reinforcement were prepared at 1600 °C by spark plasma sintering. The effects of CNTs on the microstructure and mechanical properties of nano-ZrB2 matrix composites were studied. The results indicated that adding CNTs can inhibit the abnormal grain growth of ZrB2 grains and improve the fracture toughness of the composites. The toughness mechanisms were crack deflection, crack bridging, debonding, and pull-out of CNTs. The experimental results of the nanograined ZrB2-CNTs composites were compared with those of the micro-grained ZrB2-CNTs composites. Due to the small size and surface effects, the nanograined ZrB2-CNTs composites exhibited stronger mechanical properties: the hardness, flexural strength and fracture toughness were 18.7 ± 0.2 GPa, 1016 ± 75 MPa, and 8.5 ± 0.4 MPa·m1/2, respectively. View Full-Text
Keywords: nanocomposites; carbon nanotubes (CNTs); ZrB2; fracture toughness; strength nanocomposites; carbon nanotubes (CNTs); ZrB2; fracture toughness; strength

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Jin, H.; Meng, S.; Xie, W.; Xu, C.; Niu, J. ZrB2-CNTs Nanocomposites Fabricated by Spark Plasma Sintering. Materials 2016, 9, 967.

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