论文部分内容阅读
文章利用压痕微裂纹法测试了３种Ｓｉ３Ｎ４基陶瓷的Ｒ曲线．结果发现：添加Ｙ２Ｏ３和Ａｌ２Ｏ３的Ｓｉ３Ｎ４材料（１号）具有明显上升的Ｒ曲线；添加ＺｒＯ２的材料（２号）次之；添加ＡｌＮ的材料（３号）的Ｒ曲线变化幅度最小．并结合断口形貌分析发现，材料的Ｒ曲线行为与其微观结构密切相关．
The R curves of three kinds of Si3N4 based ceramics were tested by indentation micro-crack method. The results showed that the R curve of Si3N4 with the addition of Y2O3 and Al2O3 was obviously increased, followed by the ZrO2 addition (No.2), and the change of the R curve with the addition of AlN (No.3) was the smallest. Combined with the analysis of fracture surface morphology, the R curve behavior of the material is closely related to its microstructure.