503 超塑性セラミックス粉末をインサートに用いたセラミックス接合体の機械的特性

概要

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Ceramics powder of 3Y-TZP, which can show superplasticity during and after its sintering process, was used as an insert material for solid-state bonding of a typical structural ceramic, Al_2O_3. The bonding temperature and stress were used as variables for the bonding experiments. The bonded states were observed by SEM and the bonding strengths were evaluated by four-point bending tests at room temperature. When the bonding stress was relatively low at each bonding temperature, insufficient flow as well as incomplete sintering of the insert material resulted, showing a very weak bonding strength, while when the bonding stress was quite high, the bonding strength was also relatively low. A maximum bonding strength was observed at a medium bonding stress. It was found that these results related closely with the amount of residual pores, which could partly relax residual thermal stresses, left in the insert material.
2002-08-23