Abstract
Small Al2O3 additions (∼ 4 vol%) made to Y‐TZP using an infiltration technique increased the fracture toughness and strength by ∼15% and the amount of transgranular fracture. Ionic conductivity measurements showed decreased grain‐boundary conductivity, confirming a change in the grain‐boundary composition. The predominant failure origins for both the unmodified Y‐TZP and the Al2O3—Y‐TZP were surface flaws related to agglomerates in the original powder. Finishing reduced the severity of these flaws and substantially increased the strength of both materials (>50%). The infiltration approach introduced a new flaw population in some specimens; however, this problem was overcome by a simple processing modification.
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