以ZrOCl_2·8H_2O、Sm_2O_3为原料通过化学共沉淀法制备Sm_2Zr_2O_7粉体,并运用传统固相法,热压(1300 ℃,40 MPa)制备2.5%、5%、7.5%、10%SiCp(质量分数)的Sm_2Zr_2O_7/SiC块体复合材料.压痕法测定材料的断裂韧性并结合场发射扫描电镜观察,分析裂纹扩展方式.结果显示,随着复合材料中SiC_p含量的增加,裂纹偏转增加,材料的断裂韧性明显提高.裂纹偏转分叉机制为其主要的增韧机制.
Rare-earth zirconate Sm_2Zr_2O_7 powders were synthesized by co-precipitation, and then mixed with SiC powder homogeneously. The Sm_2Zr_2O_7/SiC bulk composite was prepared by hot-pressing sintering process. The fracture toughness was tested by the indentation method. The propagation path of cracks was analysed by SEM. The results showed that the fracture toughness of the composite rises with the increasing of the SiC content. The crack deflection and branch are the main mechanism of toughening.
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