1. Understanding and quantification of grain growth mechanism in ZrO2‑carbon nanotube composites.
- Author
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Milsom, Ben, Porwal, Harshit, Viola, Giuseppe, Gao, Zhipeng, and Reece, Micheal J.
- Subjects
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METAL crystal growth , *ZIRCONIUM oxide , *CARBON nanotubes , *METALLIC composites , *NANOCOMPOSITE materials , *HIGH temperatures - Abstract
The high temperature grain growth behaviour of Y 2 O 3 partially stabilised ZrO 2 and ZrO 2 -CNT (0.5 and 2 vol%) 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 ± 20 kJ mol − 1 for the ZrO 2 , which increased with the addition of CNTs to 509 ± 41 and 497 ± 17 kJ mol − 1 for the 0.5 and 2 vol% composites respectively. A sintering exponent of 2 was observed for the ZrO 2 , 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 2 vol% composites respectively. This work confirms and quantifies the direct influence of CNTs on the grain growth mechanism and activation energy of ZrO 2 -CNT composites. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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