摘要
为明确树脂含量对复合材料摩擦学性能的影响,采用粉末冶金法成功制备了二硫化钨(WS2)与碳化硅(SiC)协同改性增强含铜聚酰亚胺(PI)树脂基复合材料。利用X射线衍射仪、扫描电子显微镜、万能力学性能试验机、摩擦磨损试验机等手段探究了PI树脂含量对复合材料微观组织、物理力学性能、摩擦磨损性能及磨损机制的作用行为。结果表明,材料制备过程中仅存在树脂基体固化烧结,并未与增强相发生化学反应,从而确保各相充分发挥其性能。同时,发现PI树脂含量对复合材料显微组织存在显著影响,由WS2与SiC形成的“核-壳”结构从高树脂含量下较大的扁平状转变成低树脂含量下的类球状及细小扁平状结构;且复合材料的致密度及显微硬度均随PI树脂含量的降低而呈现先增大后减小的趋势,压缩强度则呈上升趋势。PI树脂基复合材料的磨损率及平均摩擦系数随PI树脂含量的降低呈现出先减少后增加的趋势,当PI树脂质量分数为50%时复合材料获得了最低的摩擦系数(0.42)和磨损率[0.89×10^(-14) cm^(3)/(N·m)]。随着PI树脂含量的减少,复合材料的磨损机制由磨粒磨损转变为疲劳磨损,最后转变为严重的磨粒磨损。
In order to clarify the influences of resin content on the tribological properties of composites,polyimide(PI)resinbased composites containing copper modified by tungsten disulfide(WS2)and silicon carbide(SiC)were successfully prepared by powder metallurgy method.The effects of PI resin content on the microstructure,physical and mechanical properties,friction and wear properties and wear mechanism of the composites were investigated by using X-ray diffraction,scanning electron microscopy,universal mechanical performance testing machine,friction and wear testing machine.The results indicate that the resin only undergoes solidification and sintering without any other chemical reactions with other reinforcement phases during the preparation process,ensuring that each phase can utilize its properties fully.Meanwhile,it is found that the resin content has a significant impact on the microstructure of its composites,the"core-shell"structure formed by WS2 and SiC transforms from a large flat structure with high resin content to a spherical and fine flat structure with low resin content.The density and hardness of the composites show a trend of first increasing and then decreasing with the decrease of PI resin content,while the compressive strength shows an upward trend.The wear rate and average friction coefficient of the PI resin matrix composites show a trend of decreasing first and then increasing with the decrease of PI resin content.When the PI resin content is 50 wt%,the friction coefficient and wear rate of the composite achieve the minimum values of 0.42 and 0.89×10^(-14) cm^(3)/(N·m),respectively.The wear mechanism of the composites changes from abrasive wear to fatigue wear and then to severe abrasive wear as the resin content decreases.
作者
王文华
黄志江
郑亚杰
杨成刚
吴集思
Wang Wenhua;Huang Zhijiang;Zheng Yajie;Yang Chenggang;Wu Jisi(Department of Welding Engineering,School of Aeronautical Manufacturing Engineering,Nanchang Aviation University,Nanchang 330063,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2023年第6期109-115,134,共8页
Engineering Plastics Application
基金
江西省重点研发一般计划项目(20202BBE53001)。
