107 Control of Microstructure and Electrical Conductivity of CNT-dispersed Si_3N_4 Ceramics by Double Percolation

Abstract

CNT dispersed Si_3N4_ ceramics with double percolation structure were prepared by using granules of Si_3N_4 powder with and without CNTs followed by densification through spark plasma sintering process. Although the single percolation sample having 0.5wt% CNT was insulator because it was below percolation threshold, the electrical conductivity was showen in the double percolation sample having 0.5wt%. Consequently, it was shown that the electrical conductivity of CNT dispersed Si_3N_4 was able to be controlled by double percolation.