改性碳化硅晶须/聚酰亚胺树脂复合材料的摩擦磨损性能

Friction and Wear Performance of Modified Silicon Carbide Whisker/Polyimide Resin Composites

采用硅烷偶联剂KH550、KH560和KH570对碳化硅晶须(SiCw)进行表面改性,研究了不同硅烷偶联剂改性SiCw/聚酰亚胺(PI)复合材料的硬度、弯曲强度和摩擦磨损性能。结果表明:KH550和KH560表面改性能有效提高复合材料的硬度和弯曲强度,KH560的提高效果更加明显,但KH570改性复合材料的硬度和弯曲强度明显降低。与GCr15球在6~12 N对磨时,KH550和KH560表面改性能够明显提高复合材料的耐磨性能。在较低载荷下(6 N)对磨时,KH560改性复合材料的磨损率最低,但随摩擦载荷增加磨损率迅速升高。在9~12 N较高载荷下,KH550改性复合材料的耐磨性能在各对比试样中最好。KH570改性试样在各载荷下的耐磨性能均较差,不适用于SiCw/PI复合材料中SiCw的表面改性。

Silane coupling agents of KH550,KH560,and KH570 were employed for surface modification of silicon carbide whiskers(SiCw),and their effects on the hardness,flexural strength,and friction and wear performance of SiCw/polyimide(PI)composites were investigated.The results show that surface modification with KH550 and KH560 can effectively enhance the hardness and flexural strength of the composites,with KH560 showing more pronounced improvements.However,KH570 modification led to a notable reduction in hardness and flexural strength of the composites.When subjected to abrasion against GCr15 balls at loads ranging of 6~12 N,the surface modification with KH550 and KH560 significantly improves the wear resistance of the composites.Specifically,at lower loads(6 N)during abrasion,the KH560-modified composites exhibits the lowest wear rate,but as the friction load increases,the wear rate rises rapidly.Under higher loads of 9~12 N,the KH550-modified composites possesses the best wear resistance among all comparative samples.However,the wear resistance performance of KH570-modified samples is consistently poor under various loads,indicating that KH570 is not suitable for surface modification of SiCw in SiCw/PI composites.