Abstract
For fabricating porous Si3N4–SiO2 ceramics with good moisture resistance and mechanical and dielectric properties, a technique combining oxidation–bonding, sol–gel directional infiltration and sintering is explored. The sol–gel infiltration time has great effect on the microstructure and properties of the porous Si3N4–SiO2 ceramics. As the infiltration time increases, the porous Si3N4–SiO2 ceramics improve obviously in mechanical properties and decline little in dielectric properties. With the increase of infiltration time from 0.5 to 2.0h, the porous Si3N4–SiO2 ceramics increase obviously in flexural strength from 46 to 121MPa and in Vickers hardness from 2.4 to 5.3GPa, increase slightly in dielectric constant from 3.32 to 3.76 and in dielectric loss from 3.36×10−3 to 3.65×10−3. Due to their dense surface, the porous Si3N4–SiO2 ceramics possess good resistances to moisture and mechanical shock.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.