B-46 窒化けい素セラミックスのき裂治癒挙動と強度特性

概要

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To investigate crack healing behavior and the static and cyclic fatigue of crack healing part of silicon nitride with SiC particles, two kinds of Si_3N_4/SiC composites with different sintering additives were prepared by hot-press sintering. From the sintered bodies, four points bend specimens were cut out. A semi-circular crack was introduced on the center of tensile surface of the test specimen with a Vickers hardness tester. The dimension of the standard semi-circular crack was about 110μm. Bending strength was measured at room and elevated temperature up to 1400℃. In several crack-healed specimens, failure occurred from outside of crack-healed zone even at 1300℃ and the strength shows the same as smooth specimen. The static and cyclic fatigue test was confirmed at 1000℃ and room temperature in air. In Si_3N_4/SiC composites with sintering additive of Y_2O_38wt%, the crack healed specimen showed any degradation in strength under static and cyclic fatigue test.
一般社団法人日本機械学会の論文
2000-03-29