Abstract
Functionally graded materials (FGMs) are multi-component composites with a gradual change in composition and/or structure. ZrO2-Ni FGMs in the form of a bonding interlayer with thicknesses in the range 40–100 μm were capable of joining dense ZrO2 pieces (a) or ZrO2 to Ni specimens (b). The number of composition steps in these FGMs was adjusted according to the end joining parts in order to reduce residual stresses. The small formation of Ni7Zr2 at temperatures of 1200 °C favoured the interfacial contact giving a maximum shear stress of 20MPa for the ZrO2/FGM/ZrO2 joints.
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