Damage resistance, R-curve behavior and toughening mechanisms of ZrB2-based composites with SiC whiskers and ZrO2 fibers

作者：Lin Jia^*; Huang Yu; Zhang Houan

来源：Ceramics International, 2015, 41(2): 2690-2698.

DOI：10.1016/j.ceramint.2014.10.083

• Hot pressing
• Composites
• Fracture

The damage tolerance and R-curve behavior of ZrB2-based composites with SiC whiskers and ZrO2 fibers were investigated by using the envelope method. Obvious R-curve behavior was further observed in these composites, as a result of the combined effect of whisker toughening and transformation toughening. The SiC whiskers with high aspect ratio exhausted more fracture energy by deflection, bridging and pull-out during failure, and promoted the transformation toughening of ZrO2 fibers. It was found that these interactions produced a notable increase in toughness to 8.2 MPa m(1/2). The relatively contribution of each toughening mechanism was estimated. This calculated value was in good agreement with the experimental results (8.0 +/- 0.5 MPa m(1/2)) and the predictions of R-curve behavior (8.026 MPa m(1/2)).

• 出版日期2015-3
• 单位厦门理工学院