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Fracture Toughness of Advanced Ceramics at Room Temperature
George D Quinn1, Jonathan Salem2, Isa Bar-On3
1National Institute of Standards and Technology, Gaithersburg, MD 20899.
Abstract:
This report presents the results obtained by the five U.S. participating laboratories in the Versailles Advanced Materials and Standards (VAMAS) round-robin for fracture toughness of advanced ceramics. Three test methods were used: indentation fracture, indentation strength, and single-edge pre-cracked beam. Two materials were tested: a gas-pressure sintered silicon nitride and a zirconia toughened alumina. Consistent results were obtained with the latter two test methods. Interpretation of fracture toughness in the zirconia alumina composite was complicated by R-curve and environmentally-assisted crack growth phenomena.
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