漆籽壳纤维(LSSF)增强HDPE/UHMWPE复合材料摩擦学性能

Friction and wear properties of HDPE/UHMWPE composites reinforced with lacquer seed shell fiber

大多数水泵失效都是由于水泵导轴承的磨损毁坏而引起的,而水泵在含泥沙水体中的应用加重了水泵导轴承的磨损程度,因此,研制一种新的自润滑耐磨复合材料来代替传统金属材料用于水泵导轴承制造是一种趋势。以高密度聚乙烯(HDPE)、超高分子量聚乙烯(UHMWPE)为基体,漆籽壳纤维(LSSF)为填料,通过熔融共混、注射成型制备了LSSF/HDPE/UHMWPE复合材料,研究了复合材料的流动性和摩擦学性能。研究结果发现,LSSF能提高复合材料的熔体流动速率,并随着LSSF含量的增加而增加,当添加的纤维含量为20%时,熔体流动速率提高了38.4倍;LSSF增强的HDPE/UHMWPE复合材料的摩擦系数和磨损量都低于HDPE/UHMWPE复合材料,当添加的纤维含量为15%时,摩擦系数和磨损量分别降低了60%和72.9%。分析复合材料磨痕的SEM照片得出,磨粒磨损和黏着磨损是主要的磨损机理。

Lacquer seed shell fibers（LSSF） reinforced HDPE/UHMWPE composites were prepared by melt blending and injection molding technique. The effects of LSSF content on the fluidity and tribological properties of the materials were studied. The morphologies of wear surfaces were examined with the Scanning Electron Microscope （SEM）. The results showed that the LSSF could greatly decrease the melt viscosity of the composites during processing, and increase the melt flow rate. The melt flow rate was improved 38.4 times compared to the HDPE/UHMWPE composites when the content of added fiber was 20 wt%. The friction coefficients of the composites were all lower than that of HDPE/UHMWPE composites, and the wear loss was decreased.The friction coefficient and wear volume were reduced by up to 60% and 72.9% by adding the fiber content of 15%. The SEM photographs of wear scars of composites clearly indicated that the abrasive wear and adhe sive wear were the primary wear mechanisms.