通过对热压成形的ZrB_2+SiC、HfB_2+SiC体系以及原位合成的ZrB_2+SiC体系的压痕试验,分析了SiC颗粒增韧防热陶瓷的增韧机制.从力学角度阐述了各体系的增韧机制,从裂纹的扩展方式及耗能角度比较了各体系增韧模式的异同.分析指出,裂纹偏转、裂纹桥联、裂纹分叉钉扎等多种机制的协同作用是SiC颗粒增韧防热陶瓷韧性大幅提高的主要原因.基体与增强相之间的化学匹配关系也是影响增韧效果的原因之一.
Through the indentation test for hot-pressed ZrB_2+SiC, HfB_2+SiC and in situ ZrB_2+SiC, the toughening mechanism of SiC particle reinforced thermal protective ceramics was analyzed mechanically. The difference in different toughening modes was given through crack development and energy dissipation, which shows that the synergistic effects of crack deflection, crack bridging, crack bifurcation and crack pinning are the main reason to increase the toughness of SiC particle reinforced thermal protective ceramics. Further, the chemical matching between matrix and reinforcement also influences the toughening effects.
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