Effects of CNT Addition on Mechanical Properties, Electric Conductivity and Oxidation Resistance of Al₂O₃-TiC Composite

Abstract

Abstract. Effects of carbon nanotubes (CNT) addition on mechanical properties, electric conductivity and oxidation resistance of CNT/Al 2 O 3 -TiC composite were investigated. It was found that flexural strength, Young's modulus and fracture toughness of the composites were improved by addition of more than 2 vol%-CNT. In the composites with more than 3 vol%-CNT, the oxidation resistance of the composite was degraded. In comparison with Al 2 O 3 -26vol%TiC sample as TiC particle-percolated sample, the Al 2 O 3 -12vol%TiC-3vol%CNT sample, which is not TiC particle-percolated sample, shows almost the same mechanical properties and electric conductivity, and also shows thinner oxidized region after oxidation at 1200°C due to less TiC in the composite.