Influence of carbon nanotubes on thermal and electrical conductivity of zirconia-based composite. Issue 10 (15th May 2023)

• Record Type: Journal Article
• Authors: Wiśniewska, Maria; Laptev, Alexander M.; Marczewski, Mateusz; Leshchynsky, Volf; Lota, Grzegorz; Acznik, Ilona; Celotti, Luca; Sullivan, Alex; Szybowicz, Mirosław; Garbiec, Dariusz
• Is Part Of: Ceramics international. Volume 49:Issue 10(2023)
• Page Start: 15442
• Page End: 15450
• Publication Date: 2023-05-15
• Subjects: ZrO2-based composite -- Carbon nanotube -- Electrical conductivity -- Thermal conductivity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.129
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Carbon nanotubes (CNTs) are widely used in ceramic-matrix composites (CMC) as a filler. An individual carbon nanotube exhibits extremely high thermal conductivity, however, the influence of CNTs on the thermal conductivity of CMCs is moderate. In contrast, even a small quantity of CNTs significantly increases the electrical conductivity of CMCs. The present paper studies this contradictory influence for ZrO2 -CNTs composites with 3, 5, 10 and 20 vol% multi-wall carbon nanotubes (MWCNTs). Their thermal and electrical conductivity was studied by the laser flash method and electrochemical impedance spectroscopy. The analysis reveals that the moderate influence of MWCNTs on the thermal conductivity of composites originates from the similar thermal conductivity of MWCNTs in a bundle and zirconia. On the other hand, the substantial difference in the electrical conductivity of MWCNTs and zirconia leads to an exponential increase in the electrical conductivity of the ZrO2 -CNTs composite even with small additions of nanotubes.