摘要
为了改善水润滑轴承材料热塑性聚氨酯(TPU)的减振降噪性能,以TPU为基体、聚四氟乙烯(PTFE)为添加剂,通过物理共混的方式制备PTFE/TPU改性复合材料。在RTEC摩擦磨损实验机上模拟泥沙工况,对复合材料进行不同速度和载荷下的摩擦学试验,通过分析复合材料的力学性能、摩擦因数、表面形貌以及振动噪声行为,探讨其摩擦磨损规律与减振降噪性能。结果表明:复合材料的拉伸强度和邵氏硬度均随着PTFE含量的增加而先增加后降低,质量分数8%PTFE改性TPU复合材料表现出最好的力学性能;随着速度与载荷的增大,复合材料的摩擦因数逐渐增大,材料表面损伤、变形、剥落等严重损伤逐渐增多;与纯TPU相比,改性复合材料的摩擦磨损剧烈程度更低,摩擦因数的变化幅度较小且摩擦因数曲线相对光滑,材料微观表面的损伤更少;随着速度与载荷的增大,复合材料的振动响应与辐射噪声现象增大,振动与噪声信号的平均强度增大,频域上的频率分量增多,幅值分量增大,主频向高频转移;PTFE能够改善TPU的摩擦学性能,降低摩擦因数,同时赋予复合材料一定的减振降噪性能,并且效果在高速、高载荷下更为明显。
In order to improve the vibration and noise reduction performance of thermoplastic polyurethane(TPU),a water lubricated bearing material,PTFE/TPU modified composite material was prepared by physical blending using TPU as the matrix and polytetrafluoroethylene(PTFE)as an additive.By simulating sediment conditions on an RTEC friction and wear testing machine,tribological tests of PTFE/TPU modified composite material were conducted at different speeds and loads.By analyzing the mechanical properties,friction coefficient,surface morphology,and vibration noise behavior of com⁃posite materials,the friction and wear laws and vibration and noise reduction performance of composite materials were ex⁃plored.The results show that the tensile strength and Shore hardness of the composite material first increase and then decrease with the increase of PTFE content,and the TPU composite material with 8%mass fraction of PTFE exhibits the best mechanical properties.As the speed and load increase,the friction coefficient of composite materials gradually increa⁃ses,and serious damage such as surface damage,deformation,and peeling gradually increase.Compared with pure TPU,the friction and wear intensity of modified composite materials is lower,the change in friction coefficient is relatively small and the friction coefficient curve is relatively smooth,and the micro surface damage of the material is less.With the increase of speed and load,the vibration response and radiation noise phenomenon of composite materials increase,the average intensi⁃ty of vibration and noise signals increases,the frequency component in the frequency domain increases,the amplitude com⁃ponent increases,and the main frequency shifts to high frequency.PTFE can improve the tribological performance of TPU,reduce friction coefficient,and endow composite materials with certain vibration and noise reduction performance,and the effect is more obvious under high-speed and high load conditions.
作者
陈晨
董从林
张湘军
袁成清
白秀琴
CHEN Chen;DONG Conglin;ZHANG Xiangjun;YUAN Chengqing;BAI Xiuqin(Hubei Longzhong Laboratory,Xiangyang Hubei 441000,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan Hubei 430063,China;Reliability Engineering Institute,National Engineering Research Center for Water Transportation Safety,Wuhan Hubei 430063,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan Hubei 430063,China;China Classification Society Wuhan Branch,Wuhan Hubei 430000,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2023年第11期105-114,共10页
Lubrication Engineering
基金
国家自然科学基金面上基金项目(52075399)
湖北省隆中实验室自主创新项目(2022ZZ-05)。
关键词
聚四氟乙烯
聚氨酯
摩擦学特征
摩擦振动噪声
减振降噪性能
polytetrafluoroethylene
polyurethane
tribological characteristics
friction vibration noise
vibration and noise reduction performance