抄録
Fracture toughness of solid-state-bonded Al2O3/Ni and Al2O3/Ni-Y interfaces was studied. Fracture toughness of the Al2O3/Ni interface was smaller than Al2O3, while that of the Al2O3/Ni-Y interface was larger than Al2O3. Cracks in the Al2O3/Ni system propagated along the interface and no reaction was observed at the interface. Cracks in the Al2O3/Ni-Y system propagated not along the interface but in Al2O3. From the results of the microstructural and fractographic observations and EPMA, it is concluded that the higher fracture toughness in the Al2O3/Ni-Y system is due to the keying effect of the products formed by the reaction between Al2O3 and Y at the interface.
