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天然竹纤维在增强树脂基复合材料的应用中存在与憎水性的树脂界面相容性差等问题。通过对竹纤维进行不同工艺蒸汽爆破处理,探索其对增强复合摩阻材料界面和性能影响。结果表明,竹纤维蒸爆处理使复合材料冲击强度提高10%以上,其中压力变化影响较小,而保压时间延长使材料冲击强度增大;蒸爆处理可改善材料高温摩擦系数,提高材料制动稳定性、抗热衰退性能和耐磨性。竹纤维在蒸爆压力2 MPa时保压240 s,摩阻材料具有较佳摩擦学性能。经蒸爆处理后竹纤维外表呈棉絮状,具有更明显的细小沟壑,比表面积增大,有利于提高竹纤维与树脂基体界面结合能力。未处理样磨损表面的竹纤维在高温时炭化烧蚀严重,基体在外力作用下被撕裂剥落,而蒸爆样表面仍有大量竹纤维存留并起增强作用,周围形成较稳定摩擦表面膜,保证了材料在高温下的摩擦学性能。
Natural bamboo fiber in the application of reinforced resin-based composites and hydrophobic resin interface problems such as poor compatibility. Through the different steam explosion treatment of bamboo fiber, the influence on the interface and properties of the composite friction material was explored. The results show that the impact strength of the composite is increased by more than 10% with the steamed blast treatment of bamboo fiber, of which the influence of the pressure change is small, while the impact strength of the material increases with the prolonging of the dwell time; the steam explosion treatment can improve the friction coefficient of the material at high temperature, Dynamic stability, thermal degradation resistance and wear resistance. The bamboo fiber retains 240 s at steam explosion pressure 2 MPa, and the friction material has better tribological properties. After steamed blast treatment, the appearance of bamboo fiber was cotton floss, with more obvious small gully, the specific surface area increased, which was beneficial to improve the binding ability of bamboo fiber and resin matrix interface. The bamboo fiber on the untreated wear surface was seriously burned and charred at high temperature. The substrate was torn and peeled off under the external force. However, a large amount of bamboo fiber remained on the steam explosion-like surface and played a reinforcing role, forming a relatively stable friction surface film around, To ensure that the material under high temperature tribological properties.