Tribological behavior of thermal- and pH-sensitive microgels under steel/CoCrMo alloy contacts  

作　　者：Kequn SUN Yuanhua HU Yinghui DONG Lulu YAO Ruhong SONG Yufu XU 

机构地区：[1]Institute of Tribology,School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China [2]School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China

出　　处：《Friction》2023年第4期602-616,共15页摩擦（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51875155)。

摘　　要：The tribological behavior of 316L stainless steel/CoCrMo alloy contacts under aqueous lubrication was investigated in this work.Three types of microgels including poly(N-isopropylacrylamide)(PNIPAM),polyacrylic acid(PAA),and poly(N-isopropylacrylamide-co-acrylic acid)(PNIPAM-co-PAA)were prepared and used as lubricant additives in aqueous solutions.Tribological tests were conducted using a ball-on-disk reciprocating tribometer,over a range of temperatures,pH,and concentrations of the microgels.The PNIPAM-co-PAA microgels were proven to have excellent anti-friction and anti-wear properties,depending on the temperature and pH values of the solutions.The maximum friction coefficient coincided with the lower critical solution temperature of the PNIPAM-co-PAA microgels at 32°C.At the same time,the friction coefficient increased with the increase in pH value of the lubricant solution with the PNIPAM-co-PAA microgels.The unique thermal-and pH-sensitive properties of the PNIPAM-co-PAA microgels provided a new strategy for controlling the friction and wear of steel/CoCrMo alloy contacts under aqueous lubrication.

关 键 词：poly(N-isopropylacrylamide-co-acrylic acid)(PNIPAM-co-PAA) MICROGEL aqueous lubrication thermal-sensitive PH-SENSITIVE 

分 类 号：TS116[轻工技术与工程—纺织材料与纺织品设计]