Si3N4 powders have been pre-treated by shock activating and hot-pressed into Si3N4 ceramics. Three kinds of shock pressure, and three different sintering temperatures are used in the experiments, SEM, TEM and X-ray Diffraction have been used to analysis the structure of the Si3N4 powders and ceramics. The properties of Si3N4 ceramic have been tested. The results show that shock activation give positive action to the densification of Si3N4 powder and the increase of properties of the Si3N4 ceramics; the ceramic parts shocked under 40 GPa and sintered under 1800℃ have the best properties. The bend strength reaches 1107.2 MPa, at the same time, the fracture toughness reaches 12. 20MPa.m1/2.
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刘静宇,蔡清裕,张术华.冲击波活化热压烧结氮化硅粉末[J].国防科技大学学报,2000,22(3):65-69. LIU Jingyu, CAI Qingyu, ZHANG Shuhua. Shock Activation and Hot-Press Sintering of Si3N4 Powder[J]. Journal of National University of Defense Technology,2000,22(3):65-69.