【摘要】 基于C/C复合材料良好导电特性,采用试样直接通电加热技术,对2D C/C复合材料在室温~2 400℃范围的压缩性能进行了试验研究,发展了C/C复合材料超高温力学性能试验方法,得到了2D C/C材料压缩强度、模量随温度的变化规律及其破坏模式。结果表明,2D C/C材料在一定温度范围内表现为线弹性、脆性破坏,压缩强度与模量随温度升高而增加,其中强度较模量增幅显著,强度在2 400℃左右达到最大;纤维束层间界面性能在2D C/C复合材料中起着重要作用,层间界面性能的改变直接影响着材料的力学性能及其破坏模式。更多还原

【Abstract】 Based on good conductive performances of 2D C / C composites,their compressive properties from room temperature to 2 400 ℃ were studied by using direct electric heating technology to specimens. The test method of mechanical properties of C / C composites at ultra-high temperature was developed,and the damage morphology and changing laws of their in-plane compressive strength and modulus with respect to temperature were obtained. The results indicate that 2D C / C composites exhibit the performance of linear elastic and brittle failure in a certain temperature range,besides,both strength and modulus increase with the temperature. Strength rises dramatically,which reaches the peak at 2 400 ℃. On the other hand,the performance of inter-laminar interface between fiber and matrix plays an important role in 2D C / C composites,and its change will influence both their mechanical properties and fracture modes directly.更多还原