Abstract
The development of bimodal microstructure in Si3N4 ceramics was crucial to the thermal conductivity and fracture toughness. Silicothermic reduction treatment (SRT) combined with gas-pressure sintering (GPS) were conducted to promote the development of bimodal microstructure. SRT leads to a reduced amount of liquid phase and an increased N/O ratio in the liquid phase, resulting in a faster phase transformation rate relative to densification and a promoted grain growth during GPS. Consequently, large β-Si3N4 grains were well developed in a porous fine β-Si3N4 matrix skeleton without grain impingement. Dense Si3N4 ceramics with exaggerated bimodal microstructure was obtained after sintered at 1900 °C for 4 h. Summarily, the addition of Si leads to the improvement of thermal conductivity and fracture toughness simultaneously.
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