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Microstructure and Phase Composition of Cold Isostatically Pressed and Pressureless Sintered Silicon Nitride
O A Lukianova1, V V Krasilnikov1, A A Parkhomenko2
1Belgorod National Research University, 85, Pobedy Str., 308015, Belgorod, Russia.
Nanoscale Research Letters
|March 17, 2016
Summary
New silicon nitride ceramics doped with Y2O3 and Al2O3 oxides exhibit enhanced microstructures and mechanical properties. These advanced materials show promise for high-temperature structural applications due to their fine grain size and low weight loss.
Area of Science:
- Materials Science
- Ceramic Engineering
- Nanotechnology
Background:
- Silicon nitride (Si3N4) ceramics are crucial for high-temperature applications.
- Improving the mechanical properties and thermal stability of Si3N4 is an ongoing research area.
- Oxide doping offers a route to tailor ceramic properties.
Purpose of the Study:
- To investigate the microstructure and physical properties of Y2O3 and Al2O3 co-doped silicon nitride.
- To analyze the phase composition of the fabricated ceramics at various temperatures.
- To evaluate the suitability of these new ceramics for demanding structural applications.
Main Methods:
- Fabrication of ceramics using cold isostatic pressing and free sintering.
- Microstructural analysis using advanced imaging techniques.
- Phase composition determination via X-ray diffraction at room and elevated temperatures.
Main Results:
- The ceramics exhibited a microstructure dominated by Si5AlON7 grains with fine-grained α-Si3N4 and a minor Y2SiAlON5 phase.
- The doped silicon nitride demonstrated a beneficial combination of fine-grained structure and improved mechanical properties.
- Minimal weight loss was observed, indicating good thermal stability.
Conclusions:
- The Y2O3 and Al2O3 co-doped silicon nitride ceramics possess a unique microstructure.
- These ceramics offer an attractive combination of mechanical strength, fine grain size, and low weight loss.
- The developed materials are well-suited for high-temperature structural applications.
