Abstract
The effect of indentor load F and V-notch tip radius r on the crack resistance factor K Ic of ZrO2 + 3 mol.% Y2O3 ceramic is studied by microindentation and bending methods. Materials composed of 100% tetragonal phase (T-phase) and 70 – 80% T-phase were used. In both materials, an increase in F and a decrease in r cause a decrease in K Ic . The higher sensitivity of K Ic to F and r is observed in 100% T-phase specimens. This effect is explained by the involvement of martensite-type phase transformations.
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