POM/UHMWPE共混物摩擦磨损性能研究

Study on Friction and Wear Properties of POM/UHMWPE Blend

将 3种不同的超高摩尔质量聚乙烯 (UHMWPE)和聚甲醛 (POM)共混 ,制成POM自润滑材料 ,并研究了共混物的摩擦磨损性能。结果表明 :采用自制的PP改性UHMWPE (M UHMWPE)与POM共混 ,能有效提高POM的摩擦磨损性能 ;当M UHMWPE质量分数为 5 %时 ,POM/M UHMWPE共混物的摩擦系数从纯POM的 0 3 2降低到共混物的0 16,磨痕宽度从POM的 5 0 0mm下降为 3 5 6mm ;SEM分析表明 ,在摩擦过程中 ,M UHMWPE向磨损界面转移形成磨屑 ,有效地隔离了两摩擦面的接触 ,起到了减摩耐磨剂的作用 ,明显降低了POM树脂的摩擦系数 。

Self-lubricate POM materials were prepared by blending POM with H-UHMWPE,C-UHMWPE and M-UHMWPE, and the friction and wear properties of the blends were studied. It was found that the friction and wear properties of POM/M-UHMWPE blends were greatly improved by blending POM with M-UHMWPE. When the mass fraction of M-UHMWPE was 5%, the coefficient of friction of POM/M-UHMWPE blend reduced from 0.32 of POM to 0.16, and the wear scar width of POM/M-UHMWPE blend was decreased from 5.00 mm to 3.56 mm. The SEM of the worn surface showed in the course of friction and wear, the debris formed by M-UHMWPE transferring to the worn surface exited in the contact surface, and acted as anti-friction and wear resisting agent. The friction coefficient of POM was thus reduced remarkably and the wear resistance of POM was improved greatly.