Preparation And Properties Of Carbon Fiber Composites For Pistons

With the development of lightweight vehicles,the use of composite materials instead of high-density metal materials,seeking composite materials with high strength and high temperature performance has become the focus of research in the automotive industry.Main research of this paper is to check a kind of carbon fiber reinforced composite material for brake piston.This material uses phenolic resin as binder,improves the material properties by perfecting the process formula and using different types of resin,and provides experimental basis for making piston products instead of metal materials.Main contents of this paper include:Carbon fiber surface treatment will be carried out.Fourier infrared test method will be used for checking treatment effect.After surface treatment,polar groups are formed on the surface.Compared with untreated carbon fiber,carbon fiber composite materials after surface treatment have higher strength due to better bonding performance with resin.The composite fabric has the best overall performance when the carbon fiber content is 3%.Different amounts of carbon fiber are added into the pison carbon fiber material,and the heat resistance,thermal conductivity and friction performance parameters of the material are studied in detail.The results prove that the properties of materials with different carbon fiber content leading to different effects:For the heat resistance of the material,heat resistance performance of the composite material will be enhanced with the increase of carbon fiber content when temperature is lower than 575“C.However,when temperature is above this degree,the results turn their head to the opposite side;Thermal conductivity of the material increases with the increase of carbon fiber content,while friction coefficient and wear of the material decreasesGraphene oxide modified phenolic resin was prepared.Transmission electron microscope confirmed that the material contained 3-6 layers of graphene.Different amounts of graphene modified resins were used to test properties of the prepared composite materials.By analyzing thermal conductivity of carbon fiber materials,it was also found that its thermal conductivity changes with the content of graphene.It increased when amount of graphene was added.The results show that the heat resistance of materials is not improved obviously by using graphene modified phenolic resin.The addition of graphene is beneficial to reduce the friction coefficient and wear rate of the material.When the amount of graphene is 2%,the friction coefficient is the lowest.Carbon fiber pison composite with bisphenol A benzoxazine resin was prepared.A piston material having good dimensional stability can be prepared by using a benzoxazine resin to cure low shrinkage characteristics.The mechanical tests on the piston material showed that the strength of the prepared material was the highest when the bisphenol A type benzoxazine resin was mixed with the two resin unmodified phenolic resin 50/50;the piston material prepared by the resin was extremely low.The water absorption is 0.25%lower than that of the unmodified phenolic resin material.A boron phenolic carbon fiber piston material is prepared.The heat distortion temperature of the load can reach 200?,which is 25? higher than that of the unmodified phenolic resin piston material;the boron phenolic piston material has good heat resistance,and the friction and wear properties of the tested materials are higher than that of the unmodified phenolic resin material.And its high temperature mass wear 1s lower than that of the unmodified phenolic resin preparation material.Through the above research and analysis,it is hoped to determine the heat resist and heat conductivity mechanism of carbon fiber composites,as well as the influence on the mechanical properties of the materials.It provides theoretical guidance for future application and development.