Fully dense, undoped AIN is found to have the following average mechanical properties: hardness, 12.2 GPa; strength, 377 MPa; and fracture toughness (based on the fracture load sustained by indented disks), 3.6 MPa·m½. The addition of 2 wt% CaO to AIN changes the fracture mode from transgranular to intergranular while concurrently decreasing the hardness, strenght, and toughness. Increasing the grain size of CaO‐doped AlN decreases strength and increases toughness. Toughness estimates based on the fracture load sustained by indented disks are about twice the value determined for crack extension after indentation.
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Witek et al. (1989) studied this question.
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