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• W1997321504 abstract "The role of starting powder in the resistance of silicon nitride (Si 3 N 4 ) ceramics to strength-impairing contact damage is studied. Si 3 N 4 materials are prepared from three starting powders, at selectively increasing hot-pressing temperatures to coarsen the microstructures : (i) from relatively coarse α-phase powder, essentially equiaxed α-Si 3 N 4 grains, with limited, slow transformation to β-Si 3 N 4 grain toward the latter half of the temperature range ; (ii) from relatively fine α-phase powder, a more rapid transformation to β-Si 3 N 4 , with attendant grain elongation ; (iii) from fine β-phase powder, an essentially equiaxed β-Si 3 N 4 structure over the entire temperature range. The resulting microstructures thereby provide a spectrum of β/α phase ratios and grain sizes and shapes for investigation. Indentations with hard spheres (Hertzian test) are used to induce damage into the Si 3 N 4 specimens. Examination of the indentation sites indicates a competition between brittle and quasi-plastic damage modes : in structures with relatively equiaxed grains, the damage takes the form of classical cone cracking ; in structures with large elongate grains, the damage is distributed beneath the contact as grain-localized microfailures within a subsurface yield zone. Bend tests on specimens containing single-cycle contact damage reveal those structures with well-developed cone cracks to be highly susceptible to strength degradation. The microstructures with the greatest resistance to strength loss are those formed from fine α-phase starting powder at intermediate firing temperatures (1700°C), with characteristic large, elongate β grains. Implications of the results in the context of other mechanical properties, e.g., toughness, wear, and fatigue resistance, are discussed." @default.
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• W1997321504 date "2005-01-20" @default.
• W1997321504 modified "2023-09-25" @default.
• W1997321504 title "Effect of Starting Powder on Damage Resistance of Silicon Nitrides" @default.
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• W1997321504 doi "https://doi.org/10.1111/j.1151-2916.1998.tb02588.x" @default.
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