以不同酚醛树脂制备的C/C-SiC复合材料的力学性能

选用热固性酚醛树脂A和热塑性酚醛树脂B分别与短炭纤维、石墨粉、硅粉、碳化硅按一定比例混合后，采用温压-原位反应法，制得具有不同树脂炭基体的C／C-SiC复合材料的试样1和2，并对其力学性能进行研究，以期优化该复合材料的成分配方和进一步提高其技术性能。结果显示：试样1在垂直于纤维层方向的压缩载荷及弯曲载荷作用下，未出现纤维拔出、脱粘等现象，界面结合较强，呈现脆性断裂，压缩强度σ⊥=60．7MPa，弯曲强度σb=34．5MPa；而在平行于纤维层的压缩载荷作用下，纤维与基体存在剪切作用，出现纤维脱粘，呈现韧性断裂，σ∥=52．6MPa。试样2由于纤维的分散性不好，大量聚集在一起，在压缩和弯曲载荷作用下，均存在纤维的拔出和脱粘现象，界面结合较差，材料呈现韧性断裂，强度较低，σ⊥=45．8MPa，σ∥=19．4MPa，σb=16．1MPa。

Mechanical properties of C/C-SiC composites prepared with different phenolic resin

The thermoset phenolic resin A and thermoplastic phenolic resin B were used to mix with short carbon fibre, graphite, silicon and carborundum in suitable proportion respectively, then samples 1 and 2 of C/C-SiC composite were prepared by warm moulding and in-situ reaction process; and the mechanical properties of the two C/C-SiC composite samples with different matrixes were researched for optimizing its composition coordinating and exploring further C/C-SiC braking material with high performance. The resea...