R-curve behavior of laminated ZrB2–SiC ceramic with strong interfaces
Source abstract
Abstract
Abstract The damage resistance and R-curve behavior of laminated ZrB 2 –SiC ceramic fabricated by hot-pressing were investigated using indentation-strength technique. The difference in fracture resistance properties between the monolithic and laminated ZrB 2 –SiC ceramics was also analyzed and results showed that obvious R-curve behavior was found in laminated ZrB 2 –SiC ceramic, compared with monolithic ZrB 2 –SiC ceramics. Moreover, the indentation strength values of laminated ZrB 2 –SiC ceramic were observed to be insensitive to the increases in the indentation load, which indicated that laminated ZrB 2 –SiC ceramic has excellent damage resistance. The improvement in damage tolerance and R-curve behavior of laminated ZrB 2 –SiC ceramic was attributed to the macroscopic crack deflection due to the presence of residual compressive stresses.
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