Dielectric Properties of Porous Si3N4 Ceramics Prepared by In Situ Cordierite Bonding
In situ bonding porous silicon nitride (Si3N4) ceramics were fabricated in air using a conventional ceramic process using Si3N4, Al2O3 and MgO as the starting materials. The effects of additives content, sintering temperature and holding time on phase composition, microstructure, dielectric properties and porosity were studied. The porous Si3N4 ceramics were composed of α- Si3N4, SiO2 (cristobalite) and cordierite. Porous Si3N4 ceramics with porosities of 34.12~50.22%, dielectric constant of 2.95~4.45 and dielectric loss of ~0.0025 were obtained.
Wei Pan and Jianghong Gong
Y. F. Xia et al., "Dielectric Properties of Porous Si3N4 Ceramics Prepared by In Situ Cordierite Bonding", Key Engineering Materials, Vols. 434-435, pp. 701-704, 2010