TiN/Si3N4 nanocomposites were fabricated from β-Si3N4 and TiN nano powders by powder processing routes. The specimens were consolidated at 1600 °C for 3 min by spark plasma sintering, and nearly full densification was obtained in the resulting sintered bulk composites. The TiN phase grows rapidly and a typical twin structure of TiN can be observed in the composites. The grain size and distribution for TiN may affect the electrical resistivity, leading to a pulse current through the sintering compact. The resulting microstructure for the composite containing 10 wt% TiN reveals that grain coarsening behavior for β-Si3N 4 based grains is accelerated, and the composite has the highest toughness of 4.9 MPa m1/2 among all these composites. The other composites show nanosized β-Si3N4 based grains with a fracture toughness of nearly 4.2 MPa m1/2.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry