Understanding and quantification of grain growth mechanism in ZrO2‑carbon nanotube composites

Understanding and quantification of grain growth mechanism in ZrO2‑carbon nanotube composites The high temperature grain growth behaviour of Y2O3 partially stabilised ZrO2 and ZrO2-CNT (0.5 and 2vol%) composites was investigated in a series of isothermal experiments carried out between 1500 and 1800°C. The grain growth activation energy was found to be 417±20kJmol−1 for the ZrO2, which increased with the addition of CNTs to 509±41 and 497±17 kJ mol−1 for the 0.5 and 2vol% composites respectively. A sintering exponent of 2 was observed for the ZrO2, corresponding to normal grain growth, whilst the nanocomposites showed a CNT drag dominated sintering mechanism, with exponents of 2.7 and 3.2 for the 0.5 and 2vol% composites respectively. This work confirms and quantifies the direct influence of CNTs on the grain growth mechanism and activation energy of ZrO2-CNT composites. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials & design Elsevier

Understanding and quantification of grain growth mechanism in ZrO2‑carbon nanotube composites

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0264-1275
eISSN
0141-5530
D.O.I.
10.1016/j.matdes.2017.07.040
Publisher site
See Article on Publisher Site

Abstract

The high temperature grain growth behaviour of Y2O3 partially stabilised ZrO2 and ZrO2-CNT (0.5 and 2vol%) composites was investigated in a series of isothermal experiments carried out between 1500 and 1800°C. The grain growth activation energy was found to be 417±20kJmol−1 for the ZrO2, which increased with the addition of CNTs to 509±41 and 497±17 kJ mol−1 for the 0.5 and 2vol% composites respectively. A sintering exponent of 2 was observed for the ZrO2, corresponding to normal grain growth, whilst the nanocomposites showed a CNT drag dominated sintering mechanism, with exponents of 2.7 and 3.2 for the 0.5 and 2vol% composites respectively. This work confirms and quantifies the direct influence of CNTs on the grain growth mechanism and activation energy of ZrO2-CNT composites.

Journal

Materials & designElsevier

Published: Nov 5, 2017

References

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