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Up to now, commercially available alumina ceramics were claimed to have strength between 400 and 550MPa. However, our study shows strength ~ 2 times higher for commercially available alumina than commonly believed. The average and characteristic strength, measured on 31 pure alumina ceramic discs by ball on three balls (B3B) test, were 1205 ± 93MPa and 1257MPa, respectively, with a Weibull modulus...
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