利用压痕-强度法测定了不同弱层成分的SiC/BN层状陶瓷的阻力曲线行为,研究了BN弱层成分对SiC/BN层状陶瓷的阻力曲线行为的影响,并与SiC块体陶瓷作对比.结果表明:与SiC块体陶瓷相比,SiC/BN层状陶瓷具有更为明显的升值阻力曲线行为,且其阻力曲线行为受弱层成分的影响.其中,BN弱层中加入30%Al2O3的SiC/BN层状陶瓷显示出更为优越的抗裂纹扩展能力,其阻力曲线上升最陡,上升幅度最大.分析认为,这与它们不同的增韧机制和界面的结合状态有关.原位增韧是SiC块体陶瓷韧性提高的主要原因.裂纹遇到弱界面时发生偏转、分叉以及脱层等是层状陶瓷材料抗裂纹扩展能力提高的主要原因.而弱层成分又影响着裂纹的偏转,适当结合强度的界面有利于裂纹的偏转,结合强度太弱太强的界面都不利于裂纹的偏转.
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