CNT dispersed Si_3N_4 ceramics were fabricated by adding HfO_2 and TiO_2 to Si_3N_4Y_2O_3Al_2O_3-AIN system. As a result, dense sintered body was obtained; especially the relative density of the 5HOT sample was 98.7% after hot isostatic pressing process. It was found that a large amount of CNT existed in Si_3N_4 ceramics. Consequently, HfO_2 and TiO_2 addition was effective in fabrication of dense CNT dispersed Si_3N_4 ceramics at lower temperature.
