| With the rapid development of science and technology,the friction properties of friction materials are required higher and higher in industry and manufacturing industry under severe conditions,and polymer wear-resistant materials have attracted more and more attention.Nylon6 material itself has well mechanical strength,wear resistance and other properties,which can be used as a daily friction material.However,under severe friction conditions,nylon 6 material is limited in the use process due to the lack of wear resistance.In view of the defects of friction and wear resistance and mechanical properties of nylon 6,this paper designs the structure of nylon 6 composite through porous structure,graphene oxide filling and basalt fiber fabric reinforcement,studies the relationship between the structural characteristics of nylon 6composite and the mechanical properties and friction and wear resistance of corresponding composite,and combines the structural characterization and performance measurement The mechanism of antifriction and wear resistance of nylon 6 composite was discussed based on the analysis of test results.The main contents of the paper are summarized as follows:?1?Porous oil immersed nylon 6?PA6?composite materials were prepared by extrusion injection molding,vacuum impregnation.The effect of the amount of pore forming agent on the pore structure,mechanical properties,friction and wear resistance of PA6 composite was investigated.The effect of different content of pore forming agent on the structure of the composite was characterized by SEM.With the increase of the content of pore forming agent,the porosity of the composite increased.The results of mechanical properties show that the impact and tensile properties of porous oil impregnated PA6 composite decrease with the increase of pore forming agent content.This is because the addition of pore forming agent will lead to the decrease of resin matrix continuity.In addition,under the condition of 50N load and0.1m/s rotating speed,when the content of pore forming agent is 30 wt%,the porous oil immersed PA6 composite has the best tribological performance.The average friction coefficient is 0.103 and the wear rate is 1.14×10-4mm3/Nm.Compared with pure nylon 6,the average friction coefficient is reduced by 86.6%and the wear rate is reduced by 74.7%.The results show that porous structure can store a certain amount of lubricating oil.Under the condition of friction,the lubricating oil transfers to the wear surface,reduces the friction coefficient,improves the friction stability,and improves the wear resistance of the composite.?2?Based on the porous oil immersed structure of nylon 6 composite,graphene oxide was introduced to realize the synergistic friction reduction and wear resistance of liquid-phase oil lubrication and solid lubricant.The structure of the composites filled with different content of GO was characterized by SEM,and it was found that the porosity of the composites would be reduced by the filling of GO.The test results of mechanical properties show that the impact strength of the porous oil immersed GO/PA6 composite increases first and then decreases with the increase of GO filling content.When it bears the stress,the two-dimensional lamellar structure of GO is evenly distributed in the matrix,which can absorb energy from the matrix and improve the impact performance of the material.With the further increase of GO content,the impact strength of the composite decreased significantly,because the high content of GO made the dispersion of go in the matrix poor,which led to the decline of mechanical properties.On the other hand,the results of friction and wear properties show that the porous oil immersed GO/PA6 composite has the best tribological properties when the content of GO is 1.0wt%,and the average friction coefficient and wear rate are 0.072 and 3.23×10-5mm3/Nm,respectively.Compared with the porous oil immersed PA6 composite,the friction coefficient and wear rate are reduced by 23.2%and 36.3%respectively,indicating that the porous oil immersed structure and go filled structure are in the composite The friction coefficient of porous oil immersed GO/PA6 composite is further reduced by GO filling,and the friction stability and wear resistance of nylon 6 composite are further improved.?3?The basalt fiber fabric/graphene oxide/nylon 6?BF/GO/PA6?composite with excellent mechanical properties and high wear resistance was prepared by using the excellent mechanical properties of basalt fiber fabric.The structure characteristics of the fiber were studied by SEM,and the fiber reinforced structure and pore structure were observed.The results of mechanical properties show that the impact strength of BF/GO/PA6 composite is 48.99KJ/m2,the flexural strength is 141.89MPa and the flexural modulus is 6366.20MPa,which shows that the addition of basalt fiber fabric can greatly improve the mechanical properties of the composite.On the other hand,under the condition of 50N load and 0.1m/s rotation speed,it is found that the wear rate of porous oil impregnated nylon 6 composite reinforced by basalt fiber fabric is reduced to3.01×10-5 mm3/Nm,which indicates that the introduction of basalt fiber fabric can improve the mechanical properties and wear resistance of porous oil immersed PA6 composite simultaneously.Based on the results of the influence of the structural design of porous oil immersed,GO filling modification and basalt fiber fabric reinforcement on the mechanical and friction and wear properties of nylon 6 composite,a new method for the optimization design of the anti-wear and mechanical properties of thermoplastic composite is proposed in this paper,which can play a certain role in the development of new high-performance thermoplastic anti friction and wear materials Hope to promote the application of polymer wear-resistant materials in industry and manufacturing. |
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