半芳香族聚酰胺PA6T及其PTFE复合材料的摩擦磨损性能研究

Study on Friction and Wear Properties of Semi-aromatic Polyamide PA6T and Its PTFE Composites

对3种不同共聚结构的聚对苯二甲酰己二胺(PA6T)树脂——聚对苯二甲酰己二胺/己内酰胺(1132)、聚对苯二甲酰己二胺/己二酰己二胺(M21)和聚对苯二甲酰己二胺/己二酰己二胺(1252)以及其聚四氟乙烯(PTFE)复合材料在干摩擦条件下的摩擦磨损性能进行了研究,并使用扫描电子显微镜(SEM)对试样的磨损面进行了分析。结果表明,1252的摩擦磨损性能最好,M21次之,1132最差;PTFE的加入提高了3种树脂的摩擦磨损性能,其中对1252的摩擦磨损性能改善最大,当PTFE含量为30份(质量份,下同)时,其摩擦因数和磨损率分别降低到了0.16和1.00×10-6;磨损机理方面,1132的磨损方式主要表现为粘着磨损和疲劳磨损,而M21和1252的主要磨损方式表现为磨粒磨损;随着PTFE含量的增加,复合材料的主要磨损方式均转变为粘着磨损。

The friction and wear properties of three types of polyhexamethylene terephthalamide(PA6 T)with different copolymerization structures,including polyhexamethylene terephthalamide-co-caprolactam(1132),polyhexameth-ylene terephthalamide-co-hexamethylene adipamide(M21)and polyhexamethylene terephthalamide-co-hexameth-ylene adi-pamide(1252)were investigated under the dry sliding condition,and their worn surfaces were observed with scanning electron microscopy. The results indicated that the 1252 had the best friction and wear performance,but those of the1132 was the worst. The addition of PTFE improved the friction and wear properties of these three resins. Among them,the friction and wear properties of 1252 were improved most effectively. When the 30 phr of PTFE was incorporated,the friction coefficient and wear rate of the 1252 decreased down to 0. 16 and 1. 00×10-6,respectively. As for the wear mechanism,the wear mode of the 1132 mainly belongs to adhesive wear and fatigue wear,whereas the main wear mode of the M21 and 1252 was attributed to abrasive wear. The main wear mode of the PA6 T composites was transformed into adhesive wear with an increase in PTFE content.