Preparation of Si3N4 Ceramics with 3 wt % Y2O3–Al2O3 (2 : 1, 1 : 1, 3 : 5) Additions by Spark Plasma Sintering
Tóm tắt
α-Si3N4-based powder composites containing 3 wt % Y2O3–Al2O3 sintering aids with 2 : 1, 1 : 1, and 3 : 5 stoichiometries have been prepared by the Pechini process and spray drying. We have studied four ceramic samples produced by spark plasma sintering of the powder composites. The sintering process was run under a load of 70 MPa at a heating rate of 50°C/min as long as shrinkage of the powder composites continued. We have analyzed the shrinkage behavior of the powder composites during the sintering process; evaluated the activation energy for sintering; and measured the density, microhardness, and fracture toughness (cracking resistance) of the ceramic samples. The highest hardness, HV = 16.5 GPa, in combination with a fracture toughness KIc = 3.8 MPa m1/2, was offered by the material with an Y2O3 : Al2O3 molar ratio of 3 : 5 sintered at 1860°C. The corresponding densification factor was 99.0%. The starting mixture for this material was synthesized using spray drying.
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