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Abstract
Dense β-Si3N4 ceramics were fabricated by hot-pressed sintering at 1800°C with a mixture of α-Si3N4 powders and different amount of CeO2 additive, of which the latter is less frequently used as sintering aid to Si3N4. The effects of sintering additives concentration on grain boundary phase composition, phase transformation and the grain size of silicon nitride ceramics were investigated, followed by the influences of sintering additives content on the densification and mechanical properties of silicon nitride ceramics. The results show that increased CeO2 addition leads to greater growth anisotropy of elongated grains, and the effects of the microstructure on fracture toughness of silicon nitride ceramics were closely related to CeO2.
Acknowledgements
This work was supported by the National Natural Science Foundation of China (grant no. 51372047), the Natural Science Foundation of Heilongjiang Province of China (grant no. E201027) and the Open Fund Program ‘Fabrication and Thermal-Shock performance of Si3N4 with High Thermal Conductivity’ under National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, China.