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采用双槽口剪切法(double-notched shear,DNS)研究了二维(two dimensional,2D)碳纤维增强碳化硼-碳化硅[2DC/(BCx-SiC)n]复合材料的高温层间剪切性能,用扫描电子显微镜观察断口形貌。结果表明:在25～1200℃范围内,温度对2DC/(BCx-SiC)n复合材料的层间剪切强度有明显影响,在900℃时材料的层间剪切强度最高可达40.0MPa,分别比25℃和1200℃的高约13%和8%,略高于700℃的。此外,C/(BCx-SiC)n的层间剪切强度始终高于C/SiC的强度,且2种材料的层间剪切强度随温度变化规律相似。断口分析表明:层间剪切失效发生在基体内部或基体/纤维界面上,而纤维并没有受到损伤。
Double-notched shear (DNS) was used to study the interfacial shear of two dimensional (2D) carbon fiber reinforced boron carbide-SiC [2DC / (BCx-SiC) n] Performance, scanning electron microscopy fracture appearance. The results show that the interlaminar shear strength of 2DC / (BCx-SiC) n composites is significantly affected by the temperature in the range of 25-1200 ℃. The interlaminar shear strength of the composites at 900 ℃ is up to 40.0 MPa, Respectively, about 13% and 8% higher than 25 ° C and 1200 ° C, slightly higher than 700 ° C. In addition, the interlaminar shear strength of C / (BCx-SiC) n is always higher than that of C / SiC, and the interlaminar shear strength of C / (BCx-SiC) n is similar to that of C / SiC. Fracture analysis shows that interlaminar shear failure occurs inside the matrix or on the matrix / fiber interface, while the fibers are not damaged.