原油润滑条件下含不同粒径氧化锌丁腈橡胶的摩擦磨损行为

Friction and Wear Behavior of NBR Containing Different Particle Size of Zn O under Crude Oil Lubrication

为探讨氧化锌粒径变化对丁腈橡胶(NBR)性能的影响,分别制备普通和纳米氧化锌填充NBR试样,在原油介质中考察2种试样的溶胀性能,运用往复微机控制摩擦磨损试验机,考察原油润滑条件下2种试样的摩擦磨损行为,利用扫描电子显微镜观测其磨损表面形貌。结果表明:与添加普通级化锌试样相比,添加纳米氧化锌试样耐原油溶胀性更好,且在原油润滑条件下具有更小的摩擦因数和较小的磨损量。由扫描电镜分析可见,原油润滑条件下2种试样磨损表面均出现了Schallmach斑纹,显示出典型的黏弹性材料摩擦磨损的特征,但含纳米氧化锌试样磨损程度好于含普通氧化锌试样。纳米氧化锌填充丁腈橡胶具有较高的交联程度,致密的交联网络可有效阻止外界油分子侵入橡胶基体,减轻外界机械应力对于磨损表面的破坏程度,因而表现出了优异的摩擦学性能。

In order to investigate the effect of Zinc Oxide particle size on the properties of nitrile-butadiene rubber(NBR),the samples of NBR filled with conventional ZnO(c-ZnO)and nano-ZnO(n-ZnO)were prepared,the resistance to crude oil swelling was tested,and the friction and wear behaviors were studied using computer-controlled reciprocating wear tester under crude oil lubrication.The morphology of worn surface was measured using SEM.The results show that,compared with NBR sample containing c-ZnO,the NBR sample containing n-ZnO has good resistance to crude oil swelling,smaller friction coefficient and wear volume under the crude oil lubrication.According to the SEM analysis,Schallmach pattern appears on the wear surface of the two samples under crude oil lubrication,which shows typical viscoelastic friction and wear characteristics,however,the wear degree of the sample containing n-ZnO is better than that of the sample containing c-ZnO.The NBR containing n-ZnO has a higher crosslinking density,which can prevent effectively oil molecules invading into the bulk of NBR,reduce the damage of external mechanical stress to the wear surface,thus showing excellent tribological properties.