Preparation and Tribological Performance of Graphene Oxide Modified Basalt Fiber/Polyimide Composites
By electrostatic self-assembly method,graphene oxide(GO)was adhered to the surface of basalt fibers grafted with silane coupling agent KH550,followed by the fabrication of GO-modified basalt fiber/polyimide composite material(GBF/PI)by hot compression molding process.The mechanical and frictional-wear properties of polyimide(PI),basalt fiber/polyimide(BF/PI),KH550-modified basalt fiber/polyimide(KBF/PI),and GBF/PI composite materials were comparative investigated.The results indicate that the Vickers hardness,compressive strength,and flexural strength of the GBF/PI composite are 66.5 HV,275.9 MPa,and 169.8 MPa,respectively.These values reveal enhancements of approximately 29.2％,45.8％,and 47.1％compared to the PI specimens,21.9％,27.0％and 28.1％compared to the BF/PI specimens,and 6.9％,20.2％and 10.2％compared to the KBF/PI specimens,respectively.In comparison with the PI,BF/PI and KBF/PI specimens,the GBF/PI composites have superior thermal stability,in which the onset decomposition temperature and mass residual rate of GBF/PI are 398.4 ℃ and 57.70％,respectively,which are significantly higher than those of the PI resins at 387.5 ℃ and 49.36％.Frictional-wear test results indicate that after 60 min of sliding against GCr15,the average friction coefficient of GBF/PI is 0.617,and the wear rate is 5.22×10-6mm3/(N·m).These values are approximately 11.4％and 47.2％lower than those of the PI specimens,7.7％and 27.0％lower than the BF/PI specimens,and 8.4％and 12.0％lower than the KBF/PI specimens.The introduction of GO facilitated the formation of dense and uniform friction layer,mitigating frictional damage to the PI-based composites and enhancing their anti-wear performance.
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