沥青基炭纤维γ-射线改性对炭/ 炭复合材料力学性能的影响

为了提高沥青基炭纤维表面活性, 采用γ-射线辐照对沥青基炭纤维表面改性。用AFM、XPS 研究了γ-射线辐照改性后沥青基炭纤维表面结构的变化, 用浸润仪测定了改性前后沥青基炭纤维表面能的变化。研究了γ-射线辐照沥青基炭纤维对炭/ 炭复合材料力学性能的影响, 并用SEM 分析了炭/ 炭复合材料断口形貌。结果表明,γ-射线辐照使炭纤维表面含氧官能团和表面粗糙度增加, 提高了沥青基炭纤维的表面能; 降低了炭/ 炭复合材料孔隙率, 提高了炭/ 炭复合材料力学性能。

Effect ofγ-ray radiation of pitch carbon f iber on mechanical properties of carbon/ carbon composites

Theγ-ray radiation was used to modify the surface activity of pitch carbon fiber to improve the interfacialadhesion between the fiber and mat rix. The surface st ructures of the unt reated and t reated pitch carbon fibers wereinvestigated by AFM and XPS , and the measurement s of contact angles were used to understand the change of thesurface energy of the pitch carbon fibers. The effect s of γ-ray radiation on mechanical properties of the carbon/ carbon composites were investigated. The result s show thatγ-ray radiation increases the carbonyl functional group andthe surface roughness , improves the impregnation of the carbon fibers , decreases the composites porosity , andenhances the mechanical properties of composites.