ZTA-SiC_w-TiC复相陶瓷材料强韧化机理研究

Studies on ZTA SiC w TiC Multiphase Composite Ceramics

四方氧化锆相变增韧、碳化硅晶须补强、碳化钛粒子弥散强化，同时引入一个新的陶瓷基复合材料系统中产生了叠加的强韧化效果．热压ＺＴＡ－ＳｉＣｗ－ＴｉＣ复相陶瓷材料与Ａｌ２Ｏ３－ＳｉＣｗ－ＴｉＣ相比具有更好的综合机械性能．碳化钛在基体中形成连续的骨架阻碍晶粒的长大，随着碳化钛含量的增加，基体的硬度明显增加．主要强韧化机理有相变增韧、晶须拔出、载荷转移、裂纹偏转等．

The ZrO 2( t ) phase transformation, SiC w whisker and TiC particle dispersion were all introduced into a new ceramic composite system, leading to accumulated strengthening and toughening effects. Compared with Al 2O 3 SiC w TiC, hot pressed ZTA SiC w TiC multiphase ceramics has better comprehensive mechanical properties. TiC forms a continuous skeleton structure, preventing the growth of crystallites in the matrix. The hardness of the matrix increases with the increase of TiC content in it. Main strengthening and toughening mechanism could be explained by phase transformation, whisker pullout, load transfer, crack deflection, etc. The major fracture mode of matrix is transgranular cleavage.