Abstract
The mechanical properties of β‐SiAlON ceramics joined using β‐SiAlON‐glass‐forming adhesives consisting of mixed Si3N4, Y2O3, Al2O3, and SiO2 powders are described. Use of adhesives with a β‐SiAlON:glass ratio of 60:40 gave an optimum joint strength of 650 MPa in four‐point bending mode, i.e., 85% of that of unbonded material, when joining was carried out at 1600°C for 10 min, under an applied uniaxial pressure of 2 MPa. Bonding pressures in excess of 2 MPa caused excessive compressive creep distortion during the joining operation. The strengths of postjoined HIPed material and HIPed, unbonded material, differed by only 4%, i.e., 975 and 1010 MPa, respectively, which indicates that HIPing reduces the size of critical defects in the joint. Fracture toughness of the joint also improved upon HIPing.
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