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The Effect of Alumina/Glass Composite Composition on the Adhesion and Strength of a 96% Alumina Joint

An alumina/glass composite was examined for use as a high-temperature ceramic adhesive for bonding of 96% alumina bodies. Four compositions of alumina and glass, 90:10, 80:20, 60:40, and 40:60 by wt.% were studied, referred to here as A, B, C, and D, respectively. Rectangular bend bars were produced from compositions A-D by die pressing. Two half-sized bend bars of 96% alumina were bonded together using pastes produced from compositions A-D. The sintering shrinkage, the phase analysis, the flexural strengths, and the fracture surfaces of the sintered bend bars were examined. The XRD analysis showed a decrease in the alumina and an increase in mullite as the glass content was increased. The dilatometric results found that the onset temperature for sintering shrinkage decreased as the glass content was increased. Composition C was found to have the highest flexural strength of 94 MPa, however the flexural strength of the adhesive joint sample, was only 36 MPa. Composition D had the lowest flexural strength of 43 MPa, but it had the highest flexural strength of the adhesive joint at 61 MPa. The increased adhesive strength of composition D could be due in part to penetration of the excess glass phase into the 96% alumina body. Therefore the flexural strength of the pure compositions alone could not be used to reliably predict the adhesive bond strength. The fracture surfaces of the adhesive joints showed increasing uniformity as the glass content increased, which indicated stronger adhesion.