纤维增强石英复合材料的改性处理及性能研究

Modification treatment and properties research of fiber reinforced silicon dioxide composites

采用气相接枝方法对纤维增强石英复合材料进行改性处理,对材料的微观形貌、比表面积、介电性能、力学性能和吸湿率等进行测试和分析。结果表明,改性处理和后续热处理对材料的微观形貌和比表面积影响很小,且对材料的介电性能和力学性能没有损伤。改性处理后,材料的介电损耗随频率的变化范围从4.7×10^-3~6.8×10^-3明显降低到1.7×10^-3~2.9×10^-3,拉伸强度从48.58 MPa明显提高到63.49 MPa。改性处理的优选处理条件为(T bp+30℃)/72 h/80%M。材料的极限吸湿率在改性处理后从6.35%降低到0.32%,说明该方法具有优异的防潮效果。

The fiber reinforced quartz composites were modified by gaseous phase grafting method,and then the microcosmic pattern,specific surface area,dielectric properties,mechanic properties,moisture absorption rate and other properties of composites were measured and analyzed.The results indicate that the modification treatment and subsequent heat treatment have little influence on microcosmic pattern and specific surface area of composite,moreover no damage to dielectric properties or mechanic properties of composite occurs.After modification,the range of dielectric loss variation with frequency of composites is decreased significantly from 4.7×10^-3-6.8×10^-3 to 1.7×10^-3-2.9×10^-3,while the tensile strength of composites is increased evidently from 48.58 MPa to 63.49 MPa.The optimized processing condition of modification is(T bp+30℃)/72 h/80%M.The ultimate moisture absorption rate of the composites shows significant decrease from 6.35%to 0.32%after the modification,demonstrating the excellent moisture prevention effects of this method.