陶瓷粉增强HDPE复合材料干摩擦性能

采用熔融共混注射法制备了陶瓷粉/高密度聚乙烯复合材料;研究了不同陶瓷粉加入量的复合材料在干摩擦( 50、110 N)条件下的摩擦系数及磨损率,测试了复合材料的硬度及热稳定性能,并利用扫描电镜观察了陶瓷粉与基体的界面形貌及磨损表面形貌。结果表明:陶瓷粉的加入改善了复合材料的干摩擦性能;当陶瓷粉加入量为 20%、载荷为 110 N 时,复合材料的摩擦系数比未添加陶瓷粉的高密度聚乙烯增大了 11. 5%,而磨损率降低了 38. 8%;复合材料的磨损机理由纯高密度聚乙烯的粘着磨损( 50 N)或粘着磨损和疲劳磨损共存转变为磨粒磨损( 110 N)。复合材料干摩擦性能的改善是由于陶瓷粉与基体具有良好的界面结合,陶瓷粉提高了复合材料的硬度及热稳定性。

Dry Friction Properties of High Density Polyethylene Matrix Composite Reinforced by Ceramic Powders

The polyethylene (HDPE) matrix composite with high density reinforced by ceramic powders were prepared by melt blending injection molding. The friction coefficient and wear rate of the composite with different ceramic powders amounts were studied under dry friction conditions. The hardness and thermal stability of the composite were tested. The interface morphology between ceramic powders and matrix as well as surface morphology of friction were observed by scanning electron microscopy. Results showed that the dry friction properties of the composite were improved by ceramic powders. When ceramic powder was 20% and the load was 110 N,the friction coefficient and wear rate of CPs/KH550 /HDPE composite increased by 11. 5% and reduced by 38. 8%,respectively compared with pure HDPE. The wear mechanism was changed from adhesive wear (50 N) or adhesive wear and fatigue wear coexist to wear debris by ceramic powder (110 N). The improvement of the dry friction performance of the composite may be due to the good interfacial bonding between ceramic powder and matrix,and the hardness and thermal stability of the composite were improved.