Abstract
The microstructure and the mechanical properties of hot‐pressed tetragonal ZrO2 polycrystals (TZP) reinforced with up to 30 vol% SiC whiskers were studied. The SiC whisker‐TZP composites were stable under the hot‐pressing conditions at 1450°C. Annealing in an oxidizing atmosphere at ∼1000°C resulted in glass formation and microcracking caused by whisker oxidation and transformation of the ZrO2 grains near the whiskers to monoclinic symmetry. The fracture toughness was markedly improved by the dispersed whiskers (∼12 Mpa·m1/2 at 30 vol% SiC) compared to the values measured for the matrix (∼6 Mpa·m1/2). The flexural strength of the hot‐pressed TZP‐30 vol% SiC whisker composite at 1000°C (∼400 MPa) was twice that of the TZP matrix.
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