通过对竹纤维采用不同工艺的碱处理后，采用热压法制备改性竹纤维增强树脂基复合材料，并对竹纤维表面结构、复合材料的摩擦学性能以及磨损表面形貌进行研究。结果表明：对竹纤维进行碱处理，可有效提高纤维增强树脂基摩擦材料制动时的摩擦因数及摩擦因数稳定性。当NaOH溶液的质量浓度为200 g/L、处理时间为48 h时，该复合材料具有较好的摩擦磨损性能，平均摩擦因数由未处理时的0.21提高到0.26，总体积磨损率由2.57×10-7 cm³/(N·m)降低至1.18×10-7 cm³/(N·m)，摩擦因数偏差保持在0.08的较低水平。竹纤维经碱处理后木质素中的不同基本结构单元均发生不同程度的分解，表面变得粗糙，纤维束分裂成更小的纤维，纤维取向更接近轴向，提高了竹纤维与树脂基体界面粘结能力；同时经碱处理后的竹纤维可保持对基体和填料的强支撑作用，在高温下复合材料不易出现热衰退现象，摩擦学性能得到改善。%Different processes of alkali treatment were applied for bamboo fibers to prepare bamboo fiber reinforced resin matrix composite specimens by hot pressing. The tribological performance of the composites was tested and the surface morphologies of bamboo fibers and worn composite samples were observed. The results show that proper alkali treatment of bamboo fiber can effectively improve the friction coefficient and stability of the reinforced resin matrix friction materials. When the NaOH mass concentration is 200 g/L and treating time is 48 h, the sample has good tribological performance. Compared with the untreated sample, the average friction factor of the treated samples increases from 0.21 to 0.26, the total volume wear rate decreases from 2.57×10-7cm³·N-1·m-1 to 1.18×10-7cm³·N-1·m-1, and the deviation of friction factor maintains as low as 0.08. After treaed by alkali, the different basic structure units in lignin of bamboo fiber are decomposed in different degrees, the fiber surface becomes rough and the fiber bundles are spitted into smaller fibers which orientation is more close to the axial. As a result, the interface bonding capacity of bamboo fiber and resin matrix are improved. At the same time, the alkali treatment makes bamboo fiber supporting resin matrix and fillers better at elevated temperature, so thermal recession of composite materials is mitigated and the tribological performance is improved.
展开▼
