A preparation method of graphene modified carbon/carbon pantograph slide plate for electric locomotive

Abstract

The invention belongs to the technical field of accessories of transportation vehicles, and relates to a preparation method for a graphene modified carbon / carbon pantograph contact strip used for an electric locomotive. According to the invention, by utilization of characteristics of high strength, high electrical conductivity and high thermal conductivity of graphene, the graphene is adopted forfunctional modification of a carbon / carbon composite material; the graphene and resin are mixed and diluted through an organic solvent; an obtained mixture is pressurized and immersed into a porous chemical-vapor-deposition-treated green body of the carbon / carbon composite material; thus, the graphene modified carbon / carbon pantograph contact strip is prepared through curing, carbonization and graphitization processes, has bending strength of no less than 270 MPa, shearing strength of no less than 120 MPa, impact toughness of no less than 2.7 J / cm<2>, electrical resistivity of no more than 11.5 [mu]omega.m and a wear rate of no more than 11.0 mm / 10000 km, and has the advantages of excellent mechanical properties, high mechanical strength, good impact toughness, low electrical resistivity,good self-lubricating properties and strong friction and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of transportation vehicle accessories, and in particular relates to a method for preparing a graphene-modified carbon / carbon pantograph slide plate for an electric locomotive. Background technique [0002] The pantograph slide plate is a key component for the electric locomotive to obtain electric energy from the power supply catenary. It is installed on the uppermost part of the pantograph and directly contacts with the catenary wire. The pantograph slide works in the natural environment, and constantly generates friction and impact with the catenary wire during operation. The relationship between the pantograph slide plate and the catenary wire constitutes a pair of special friction pairs with mechanical and electrical coupling, so there are strict requirements on the comprehensive performance of the selected materials. [0003] As the key component of the electric locomotive to input electric energy from...

AI Technical Summary

Problems solved by technology

However, the mechanical strength of metal-impregnated carbon slides, especially the impact strength, needs to be further improved.

[0005] According to data retrieval, Chinese invention patent CN1178745A discloses a carbon-carbon composite material pantograph slide plate, which uses carbon fiber reinforced carbon-based composite materials to manufacture electric locomotive pantograph slide plates, uses copper-plated carbon powder as the matrix material, and uses short fiber As a reinforcing agent, a thermosetting resin is used as a binder, and the raw materials are mixed for cold pressing and hot pressing, so that the thermosetting resin is cured and formed. This pantograph sliding plate material has good friction and wear properties, but its mechanical strength is not high.

Chinese invention patent CN101049803A adopts needle-punched quasi-three-dimensional structure prefabricated body, through chemical vapor deposition of pyrolytic carbon, resin impregnation-carbonization repeated densification treatment several times, the density of the system is ≥ 1.70g / cm 3 The electric locomotive pantograph slide plate material, although this kind of slide plate has low density, light weight and high mechanical strength, but has a large resistivity, weak self-lubricating ability, and serious wear and tear on the wires

Chinese patent CN 105152674 A mixes graphene and chopped carbon fiber to obtain a graphene-chopped carbon fiber suspension; injects the pre-dehydrated graphene-chopped carbon fiber suspension into a graphite mold, freezes below 0°C, and freezes and dries And press molding to obtain graphene-chopped carbon fiber reinforcement; the prepared graphene-chopped carbon fiber reinforcement is subjected to chemical vapor deposition pyrolytic carbon setting, followed by multiple coal tar pitch impregnation-carbonization, and finally graphitization treatment to obtain graphite Olefin-modified carbon / carbon composites, the short fibers used have low mechanical strength

Chinese patent CN 101830723A adds boron catalyst and dispersant to the resin solution with high carbon residue, then impregnates it in the carbon fiber braid, then undergoes pressure curing treatment and normal pressure carbonization treatment, and finally conducts high temperature graphitization treatment to produce Although the obtained pantograph skateboard has good friction performance and electrical conductivity, it adopts pure resin dense carbon fiber weaving body. After high temperature treatment, a large number of pores will appear due to resin shrinkage, which will reduce the overall strength of the skateboard. In addition, resin charcoal is hard charcoal. , the amount of wear on the wire is large, which is not conducive to protecting the wire

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