The mechanical properties of phenol formaldehyde (phenolic novolac) and short carbon fiber T300 polymer-based nano-composites-reinforced with nano-silica and nano-clay particles have been studied experimentally. By increasing the weight percentage of the short carbon fiber in the phenol formaldehyde, the strength of the composite increases, but its plastic deformation is severely limited. Also, in the case of composite reinforced with nano-silica particles, the tensile and flexural strength of the composite with the increase in the weight percentage of the nano-silica increase by 1% to 3%, whereas with the nano-clay particles, the tensile and flexural strength of the composite decrease by 1% to 3%. It is composite with 1% weight percentage of the nano-clay particle which has the highest strength in comparison to the other samples. Regardless of the type of corrosive solution, the composite strength decreases significantly over 25 days. However, with an increase in the duration from 25 days to 45 days, a slight change has been observed. The outcomes indicate that the corrosion of PF/CF40% composites and the composite reinforced with silica nanoparticles are higher corrosion rate in acid than in salt solution. In contrast, the nano-clay composite has more corrosion in salt solution. Furthermore, the analysis of the fracture surface of samples done by SEM microscopy shows reduction of the porosity in the case of using nanoparticles.

中文翻译：

---

酚醛短碳纤维纳米二氧化硅与纳米粘土复合材料的力学性能

对苯酚甲醛（酚醛清漆）和纳米二氧化硅和纳米粘土颗粒增强的短碳纤维T300聚合物基纳米复合材料的力学性能进行了实验研究。通过增加苯酚甲醛中短碳纤维的重量百分比，复合材料的强度增加，但其塑性变形受到严重限制。此外，在纳米二氧化硅颗粒增强的复合材料的情况下，复合材料的拉伸和弯曲强度随着纳米二氧化硅重量百分比的增加而增加1％至3％，而使用纳米粘土颗粒，复合材料的拉伸和弯曲强度降低1%~3%。它与 1% 重量百分比的纳米粘土颗粒复合，与其他样品相比具有最高的强度。无论腐蚀性溶液的类型如何，复合材料强度在 25 天后都会显着下降。然而，随着持续时间从 25 天增加到 45 天，观察到了轻微的变化。结果表明，PF/CF40%复合材料和二氧化硅纳米粒子增强复合材料在酸溶液中的腐蚀速率高于盐溶液中的腐蚀速率。相比之下，纳米粘土复合材料在盐溶液中的腐蚀性更强。此外，通过 SEM 显微镜对样品断裂表面的分析表明，在使用纳米颗粒的情况下孔隙率降低。结果表明，PF/CF40%复合材料和二氧化硅纳米粒子增强复合材料在酸溶液中的腐蚀速率高于盐溶液中的腐蚀速率。相比之下，纳米粘土复合材料在盐溶液中的腐蚀性更强。此外，通过 SEM 显微镜对样品断裂表面的分析表明，在使用纳米颗粒的情况下孔隙率降低。结果表明，PF/CF40%复合材料和二氧化硅纳米粒子增强复合材料在酸溶液中的腐蚀速率高于盐溶液中的腐蚀速率。相比之下，纳米粘土复合材料在盐溶液中的腐蚀性更强。此外，通过 SEM 显微镜对样品断裂表面的分析表明，在使用纳米颗粒的情况下孔隙率降低。