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Ah, the typo I just corrected (aluminum to alumina) appears to be widespread (many sources), the article text seems to have been lifted from one of those. "Zirconia toughened aluminum oxide" or "Zirconia toughened aluminum ceramic" might be the intention, but I could find no references that refer to it as a metal. Adx (talk) 23:54, 22 August 2015 (UTC)