PURPOSE:To improve the strength of a bonded body at a high temp. by applying build up spraying of a specified bonding material on the bonded part, and then heat-treating the bonded part at the time of bonding Al2O3-based ceramics. CONSTITUTION:When the split Al2O3-based ceramics are bonded, build up spraying of an Al2O3-ZrO2-3Al2O3.2SiO2 based bonding material is applied on the bonded part, and then the bonded part is heat-treated at 900-1200 deg.C for =1hr. In this case, the surface roughness of 20-60mu Rmax is previously imparted to the bonding parts or the bonding base material is preheated at =800 deg.C, and then the build up spraying is preferably applied to the bonded part. Furthermore, a groove or a groove having a flat face or a curved face is formed at the bonding parts, and then build up spraying is preferably applied on the bonded part.
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