The joining technique based on the use of a glass powder as bonding interlayer between two ceramic pieces is applied to systems formed by liquid phase sintered Si3N4 or SiC as the ceramic part and Y-Al-Silicate as the glassy interlayer. The features influencing the adhesion and reaction between the ceramics and the glass are studied. The microstructure of the interfacial region is function of the relative mobility of the ceramic grains when the glass wets them. The glass tends to penetrate in Si3N4 joints through grain boundaries, because the van der Waals attractive forces between the Si3N4 grains are weak. In case of SiC, the glass forms an interlayer characterized by well defined interfaces with the ceramic, because the strong attractive forces among the SiC grains inhibits the glass penetration. Mechanical properties of selected bonded samples are presented.
Joining by Liquid Wetting and Capillarity of silicon nitride and silicon carbide
Esposito L;Bellosi A
2002
Abstract
The joining technique based on the use of a glass powder as bonding interlayer between two ceramic pieces is applied to systems formed by liquid phase sintered Si3N4 or SiC as the ceramic part and Y-Al-Silicate as the glassy interlayer. The features influencing the adhesion and reaction between the ceramics and the glass are studied. The microstructure of the interfacial region is function of the relative mobility of the ceramic grains when the glass wets them. The glass tends to penetrate in Si3N4 joints through grain boundaries, because the van der Waals attractive forces between the Si3N4 grains are weak. In case of SiC, the glass forms an interlayer characterized by well defined interfaces with the ceramic, because the strong attractive forces among the SiC grains inhibits the glass penetration. Mechanical properties of selected bonded samples are presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
