高硅氧玻璃纤维对多孔碳基复合材料力学性能的影响

为提高碳基复合材料的力学性能,采用高硅氧玻璃纤维改性酚醛泡沫,通过发泡法制备碳基复合材料前驱体,并对其进行碳化得到多孔碳基复合材料.利用悬臂梁冲击试验机、微机控制电子万能试验机对该多孔碳基复合材料的力学性能进行表征,研究高硅氧玻璃纤维的质量分数、长度及纤维直径对多孔碳基复合材料力学性能的影响.结果表明,纤维直径为6.5μm的玻璃纤维增强效果最明显,且当玻璃纤维质量分数为6%,纤维长度为6mm时,碳基复合材料的力学性能最优,此时复合材料压缩强度为0.36MPa,冲击强度为1.43kJ/m~2,弯曲强度为0.47MPa.

Effect of high silicone glass fiber on mechanical properties of porous carbon-based composites

In order to improve the mechanical properties of caron-based composities, the porous carbon-based composites were obtained by carbonized phenolic foam which was prepared by foaming after modifing with high silica glass fiber.The mechanical properties of the composites were investigated by the cantilever impact tester and the microcomputer controlled electronic universal testing machine.The effects of the mass concentration,length and fiber diameter of high silica glass fiber on the mechanical properties of porous carbon-based composites were studied.The results show that the reinforcing effect of glass fiber whose diameter is 6.5 μm is the most obvious.The mechanical properties of the composites are the best for samples with fiber mass concentration of 6% and length of 6 mm: The compressive strength is 0.36 MPa, the impact strength is 1.43 kJ/m2, and bending strength is 0.47 MPa.