| The purpose of this paper is to study the applications of different fiber-reinforced polymer composite materials(FRP)in protecting metals,to observe and analyze the micro-morphology of different FRP-protected metals and aluminum alloy friction pairs after friction,and also to analyze their friction and wear mechanisms.In addition,diatom shell was incorporated to analyze the influence of the filler effect on the performance of FRP composite materials in metal protection.In this thesis,by using high-performance thermosetting epoxy resin as resin matrix,carbon fiber,glass fiber,basalt fiber,and aramid fiber as reinforcing fibers,various FRP-protected metals have been successfully prepared and their friction and wear properties were explored..The surface morphology of the friction surface was measured with various techniques.The surface composition was measured to obtain FRP composite materials suitable for metal protection under different friction conditions.At the same time,FRP composites were modified by using diatom shell materials to prepare the corresponding metal protection samples.Through the designed experiments,the impact in protection of different FRP composite materials by diatom shells in metal was investigated.The experimental results show that different types of fibers have a great impact on the friction and wear performance of FRP composite metal protection samples.When carbon fiber is used as a reinforcing material,a solid lubricating layer can be effectively formed on the friction surface because of the multilayer structure of the composite material,which causes a relatively low average friction coefficient and wear rate.When glass fiber is used,due to its high hardness,it can conduct external force well within the load range,so that the sample performs relatively well in the high-load conditions,which makes it suitable for metal protection in high load and medium friction speed working environments.When basalt fiber is a reinforcing material,it can effectively support the friction surface layer.However,basalt fiber can not effectively block the propagation of cracks.Therefore it is suitable for those requiring high friction coefficient,high load and stable low friction speed metal protection conditions.When aramid fiber is used as a reinforcing material,its poor hardness but high toughness cause the sample to have a low friction under low friction speed and load,which can be used in a stable low load and low friction speed working environment requiring low friction coefficient.The incorporation of diatom shell can improve the surface hardness of the four kinds of FRP composite metal protection samples,strengthen the adhesion betweenFRP composite materials and metal,and improve the water absorption performance of FRP materials themselves.At the same time,the diatom shell modification has different effects on the friction performance for different composite samples.The metal protection samples with glass fiber,basalt fiber and aramid fiber show a downward trend in average friction coefficient after the diatom shell modification,while the average friction coefficient of the metal protection samples with carbon fiber shows an upward trend.It has been found that the carbon fiber cannot be exposed on the friction surface to exert self-lubricating performance.As for the wear rate,the four types of FRP composite metal protective samples all have a downward trend after the diatom shell modification. |
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