Novel high-performance repairable electric locomotive pantograph sliding plate and preparation method thereof

Abstract

The invention relates to a novel high-performance repairable electric locomotive pantograph sliding plate and a preparation method thereof. The pantograph sliding plate is formed by a single metal sliding plate substrate and a conductive, wear-resistant, anti-corrosion and self-lubricating integrated coating. The surface coating is formed by directly conducting plasma spraying on Cu-TiO2 compositepowder of a core-shell structure on the single metal substrate; the coating is prepared from, by mass, 60%-70% of Ti4O7, 15%-25% of Cu, 10%-15% of TixO[2x-1] and 5%-10% of TiO2, wherein x is larger than or equal to 5 and smaller than and equal to 10. Accordingly, the pantograph sliding plate takes a surface multifunctional composite coating as a working layer, damage can be repaired again throughcomposite powder plasma spraying after use, and the coating size precision and service performance are recovered. By means of the pantograph sliding plate, the problems that a traditional metal sliding plate and a wire are worn due to adhesion, the service life is short, and a powder metallurgy sliding plate and a carbon sliding plate are high in cost are solved, and the sliding plate has the good economical benefit and the wide application prospect.

Description

technical field [0001] The invention relates to the field of preparation of electric locomotive pantograph slides, in particular to a high-performance, repairable pantograph slide composed of a surface conductive, wear-resistant, anti-corrosion, self-lubricating integrated coating and a single metal slide base and a preparation method thereof. Background technique [0002] Pantograph, also known as pantograph, is a general term for equipment that allows electrified railway vehicles to obtain electrical energy from overhead bare wires. The pantograph slide is an important part of the pantograph. It is fixed on the top of the bow head through conductive glue or mechanical locks, and directly contacts the catenary wire. During the operation of the electric locomotive, the pantograph slides on the catenary. It slides on the wire and obtains current from the wire to provide power for the locomotive. It is an important current-collecting component of the power source of the electr...

AI Technical Summary

Problems solved by technology

[0004] Pantograph slides are mainly divided into two categories: metal-based slides and carbon-based slides according to their materials. Metal-based slides have excellent electrical conductivity, but their materials are similar to catenary wires, have strong affinity, and are prone to adhesive wear. The wear and tear of the sliding plate is serious, and it has been eliminated at present; the powder metallurgy sliding plate is divided into two types: iron-based and copper-based. Since the base material of the powder metallurgy sliding plate is still metal, which is similar to the material of the copper-magnesium alloy catenary wire, the wear of the contact wire is very serious.

The self-lubricating performance of the carbon skateboard is good, and the wear and tear on the catenary wire is small, but the mechanical strength of the carbon skateboard is low, easy to break and break, and the inherent resistance is large, which will generate high temperature to oxidize the wire

Existing pantograph slides cannot achieve high electrical conductivity and high wear resistance at the same time. At the same time, the worn pantograph slides cannot be repaired, and only the surface wear needs to be replaced. Damaged slides are usually scrapped directly, which has a great impact on resources. huge waste

[0005] The existing pantograph slides mainly have the following problems: (1) Powder metallurgy slides are divided into copper base and iron base, both of which have good mechanical strength and electrical conductivity, but pantographs with a large amount of copper Skateboard material has a good affinity with hard copper catenary wires, which is easy to cause adhesion between the pantograph and catenary wires, causing serious wear to the catenary wires; the surface hardness of iron-based powder metallurgy skateboards is much higher than that of copper wires. Greater wear on catenary conductors even with good lubrication

(2) The mechanical strength of metal-impregnated carbon skateboards is low, and the impact toughness is relatively poor. During the high-speed operation of electric locomotives, the hard points of the wires are easily broken. In severe cases, the skateboards will break. The service life of carbon skateboards is low. Serious wear and tear during use, prone to partial strain, especially in rainy seasons and wet areas, due to increased friction, the probability of pantograph-catenary failure increases

(3) The corrosion resistance of the powder metallurgy alloy slide plate is poor. The working environment of the high-speed railway pantograph slide plate is harsh, and it is easily corroded by moisture, chemical gases and salts in the atmosphere. When the air humidity is high When the water on the surface of the skateboard will condense into a water film, the O in the atmosphere 2 , CO 2 and other gases such as H 2 S, SO 2 , Cl 2 etc. are easily dissolved in the water film to form a thin electrolyte layer. Due to the difference in the potential of the metal electrodes, electrochemical corrosion will occur

(4) The preparation of existing pantograph carbon slides requires multiple processes such as raw material mixing, cold pressing, hot pressing, pressure curing, roasting and high-temperature graphitization. The process is complex, the process steps are many, and the production process is time-consuming and laborious. , low production efficiency

(5) The production cost of the pantograph slide with good performance is relatively high

On the one hand, the complex and difficult production process makes the cost of the pantograph slide higher; on the other hand, due to the scarcity of copper resources, copper is expensive, which increases the cost of materials

(6) At present, the service life of pantograph slides is relatively low. After the slides are damaged or their performance deteriorates, replacement parts are often used for repair. Damaged pantograph slides cannot be recycled, repaired or remanufactured, causing a huge waste of resources

[0008] The above patents use different methods to improve the conductivity and impact strength of the pantograph slide, but they are still improved on the basis of the existing pantograph slide, and the metal-based slide still has serious wear on the contact wires. Carbon-based skateboards can’t solve the problem of skateboard breakage and slag falling caused by soft carbon materials, so it can’t fundamentally improve the performance of pantograph skateboards

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