Microstructure characterization of in situ synthesized porous Si2N2O ceramics using spodumene additive

Porous Si2N2O ceramics was synthesized by the tert-butyl alcohol-based gel-casting method at a relatively low temperature using Si3N4 and SiO2 powders as the starting materials and spodumene (LiAl(SiO3)2) as the sintering additive. Porous Si2N2O ceramics with relative high compressive strength (10.80 MPa) and high porosity (65.5%) were successfully fabricated. The microstructure of porous Si2N2O after sintering at different sintering regimes was studied. The fibers observed in the pores can increase the compressive strength and the specific surface area of the sample.