Carbon-based slider material for railway vehicle and preparation method thereof

Abstract

The invention relates to a carbon-based slider material for a railway vehicle. The mixture of graphite and coke is used as the substrate of the material, wherein the contents of graphite and coke are 15-35% and 35-55% based on the total mass of all components respectively; coal pitch is used as a binder, which accounts for 25-30% of the total mass of all components; the mixture of 1-3% of sulphur powder, 1-3% of glass powder, 1-2% of alumina and 0.5-1% of molybdenum disulfide is used as a friction modifier based on the total mass of all components; the materials are completely mixed by a dry mixing method and subject to hot pressing formation of three stages; then normal-pressure carbonization is performed in atmosphere of nitrogen; and finally bronzing is performed. The method is simple in operation, has low cost and is suitable for large-scale production; the materials have high conductivity, excellent friction performance and relatively high mechanical performance and are suitable for being used as the collection friction material of a railway traffic vehicle.

Description

technical field [0001] The invention relates to a carbon-based slider material for rail vehicles and a preparation method thereof, and belongs to the technical field of carbon-based flow-receiving friction materials. Background technique [0002] The electrification and high-speed of railways have become the development trend of the world's railway transportation, and the pantograph slide is the soul part of the electric locomotive, and the quality of the slide has an important impact on the flow of the locomotive. At present, the slides used in electric locomotives mainly include copper slides, pure carbon slides, powder metallurgy slides and metal-impregnated carbon slides. Copper sliding plate has good electrical conductivity, high mechanical strength, convenient material acquisition, long service life, and low cost, but it has a large wear on catenary wires and poor arc resistance, and its use is currently restricted; pure carbon sliding plate has self-lubricating proper...

AI Technical Summary

Problems solved by technology

Copper sliding plate has good electrical conductivity, high mechanical strength, convenient material acquisition, long service life, and low cost, but it has a large wear on catenary wires and poor arc resistance, and its use is currently restricted; pure carbon sliding plate has self-lubricating properties Low, and has good contact stability, but its inherent resistance is large, low mechanical strength, brittle, prone to breakage and block loss, and is also greatly limited in the scope of use; powder metallurgy slides generally have iron base and copper There are two basic types, which have high mechanical strength and strong impact resistance, but they are not ideal materials for catenary wires. The biggest shortcoming is poor arc resistance. The arc generated when offline often burns the slide plate or The mesh wire is melted; the impregnated metal slide plate has good electrical conductivity, which basically solves the problem of low mechanical strength of the pure carbon slide plate, greatly improves the wear resistance, and can fundamentally solve the problem of excessive wear of the mesh wire, but its impact resistance Insufficient, easy to appear block phenomenon, need to be constantly shaped during use, and the preparation process is complicated, the production and maintenance costs are too high

[0003] In order to solve the deficiencies of the above-mentioned pantograph slides, in recent years, some domestic scientific research institutions have begun to use carbon-based composite materials as slide materials. Some slides use copper-plated graphite as the conductive base material or modified components. Chopped carbon fiber (less than 8cm), continuous long carbon fiber (diameter less than 20μm) and copper-coated carbon fiber are used as reinforcing materials to develop skateboard materials. Although they all have good mechanical strength and electrical conductivity, they also have excellent friction and wear properties. , but the raw material pretreatment process is complex and the production cost is high, which greatly reduces its market competitiveness

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