Title of article :
Toughening of laminated ZrB2–SiC ceramics with residual surface compression
Author/Authors :
Zhang، نويسنده , , Xinghong and Zhou، نويسنده , , Peng-Jie Hu، نويسنده , , Ping and Han، نويسنده , , Wenbo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Abstract :
Laminated ZrB2–SiC ceramics with residual surface compression were prepared by stacking layers with different SiC contents. The maximum apparent fracture toughness of these laminated ZrB2–SiC ceramics was 10.4 MPam1/2, which was much higher than that of monolithic ZrB2–SiC ceramics. The theoretical predictions showed that the apparent fracture toughness was strongly dependent on the position of the notch tip, which was confirmed by the SENB tests. Moreover, laminated ceramics showed a higher fracture load when the notch tip located in the compressive layer, whereas showed a lower fracture load as the notch tip within the tensile layer. The toughening effect of residual compressive stresses was verified by the appearance of crack deflection and pop-in event. The influence of geometrical parameters on the apparent fracture toughness and residual stresses was analyzed. The results of theoretical calculation indicated that the highest residual compressive stress did not correspond to the highest apparent fracture toughness.
Keywords :
D. Borides , Laminated structure , C. Toughness and toughening , C. Fracture
Journal title :
Journal of the European Ceramic Society
Journal title :
Journal of the European Ceramic Society