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Preparation method of copper based sliding plate material

A sliding plate, copper-based technology, applied in the field of material science, can solve the problems of high material density of pantograph sliding plates, inability to achieve one step, inconvenient practical application, etc., to achieve excellent arc resistance and mechanical properties, low cost, material composition less effect

Inactive Publication Date: 2015-09-16
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent application number: 201010580088.0, titled "A Good Preparation Method for Copper-Based Pantograph Sliding Plate Material", uses dispersion-strengthened copper powder as the matrix, copper-plated graphite as the wear-reducing material, and tin and lead metal powders It is an additive, mixed uniformly, and then hot-pressed and sintered to form a pantograph sliding plate material. The preparation process of this method is simple and easy to operate, but the obtained pantograph sliding plate material lacks reinforcing phases such as carbon nanotubes and ceramic particles, and its performance will deteriorate. It has been greatly affected; Chinese patent application number: 201110004880.6, titled "Reinforced Pantograph Sliding Plate Material and Preparation Method Using Copper-coated Carbon Nanotubes", through the introduction of surface copper-coated carbon nanotubes, Ti 3 SiC 2 、TiB 2 The powder raw material and copper are prepared in different volume ratios according to the process flow of cold pressing-sintering-secondary cold pressing-secondary sintering to prepare the pantograph sliding plate material. The volume ratio can be deduced that the obtained pantograph slide material density will be relatively high, which will bring inconvenience to practical applications; Chinese patent application number: 201210442516.2, titled "a carbon nanotube-reinforced carbon-aluminum-copper composite slide plate preparation method" , with copper and aluminum as the base material, carbon nanotubes as the reinforcing material, and carbon as the self-lubricating and wear-resistant material. It also contains barium sulfate, silicon dioxide, nickel, tin, and niobium, and is distributed according to a certain mass ratio. The pantograph slide plate material is prepared by combining cold pressing and hot pressing to reduce the resistivity, increase the compressive strength, and prolong the service life. However, the operation of cold pressing is likely to cause uneven composition. Delamination and fracture are prone to occur during heating
Separate pressurization and heating operations also have the disadvantage of cumbersome operations

Method used

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  • Preparation method of copper based sliding plate material
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  • Preparation method of copper based sliding plate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A. After carbon nanotubes, graphite, and titanium silicon carbon are pretreated by wet chemical methods, electroless copper plating is performed. Then, together with the electrolytic copper powder, it is vacuum-dried, agate-milled, and sieved through a No. 9 Pharmacopoeia inspection sieve for use. The weight percentages of raw material components are: electrolytic copper powder 65%, copper-coated carbon nanotubes 10%, copper-coated graphite 10%, copper-coated Ti 3 SiC 2 Powder 15%. Then adopt horizontal ball mill ball mill to make it mix evenly for 3 hours;

[0034] B. Put the above-mentioned uniformly mixed powder into a high-temperature and high-pressure resistant graphite mold, pressurize to a pressure of 80MPa in a vacuum hot-pressing sintering furnace, and simultaneously raise the temperature to 800°C, hold the pressure and keep the temperature for 2 hours;

[0035] C.B Step pressure holding and heat preservation are over, release the pressure immediately, and c...

Embodiment 2

[0054] The method of this example is basically the same as that of Example 1, the difference is only:

[0055] The weight percent of the material combination in the step A is: electrolytic copper powder 5%, copper-plated carbon nanotube 90%, copper-plated graphite 2.5%, copper-plated titanium silicon carbon 2.5%. The milling time is 24 hours.

[0056] The vacuum hot pressing sintering pressure in step B is 120MPa, the temperature is 200°C, and the pressure holding and holding time are 24 hours.

[0057] The heat preservation temperature after pressure relief in step C is 250° C., and the heat preservation time is 24 hours.

Embodiment 3

[0059] The method of this example is basically the same as that of Example 1, the difference is only:

[0060] The weight percent of the material combination in step A is: electrolytic copper powder 90%, copper-plated carbon nanotube 2.5%, copper-plated graphite 2.5%, copper-plated titanium silicon carbon 5%. Ball milling time is 1 hour.

[0061] The vacuum hot pressing sintering pressure in step B is 20MPa, the temperature is 1200°C, and the pressure holding and holding time are 0.5 hours.

[0062] The heat preservation temperature after pressure relief in step C is 1250° C., and the heat preservation time is 0.5 hour.

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Abstract

The invention provides a preparation method of a copper based sliding plate material, and belongs to the functional material preparation technical field. According to the method, copper is used as a base material, carbon nanotubes and titanium silicon carbide are used as reinforcing materials, graphite is used as a self-lubricating wear-resistant material, and chemical copper plating is carried out after pretreatment by a wet chemical method. The content of copper plated carbon nanotubes is 2.5-90%, the content of copper plated graphite is 2.5-90%, the content of copper plated titanium silicon carbide is 2.5-90%, and the content of an electrolytic copper powder is 5-90%. The components of the obtained four raw materials are subjected to ball milling in a ball mill according to the proportion, so as to achieve the purpose of uniform mixing; finally, the four materials are subjected to mixed hot pressing sintering into an organic whole body by adopting a vacuum hot pressing sintering furnace at high temperature and high pressure; heat preservation treatment at a certain temperature is carried out, so that the purpose of structural stability is achieved, the material has the performance of high electrical conductivity, high lubricity, high wear resistance and the like, and ultimately, the copper based sliding plate material with excellent performance is obtained. The copper based sliding plate material is mainly used for manufacture of track traffic equipment.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a preparation method of a conductive material. Background technique [0002] With the development of society, there is more and more demand for high conductivity and high wear resistance skateboard materials. Especially in recent years, China's rail transit has developed vigorously. Harmony bullet trains and high-speed rails have continuously changed people's lives, and they have been sold abroad, which has amazed the world. At the same time of continuous development, the requirements for pantograph sliding plate materials, grounding device materials and related technologies are getting higher and higher. Pantograph slide material and grounding device material are sliding or rolling contacts that conduct current from one part to the other. Its working conditions are affected by the harsh natural environment, high current, high speed, etc., so it needs to ha...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C9/00C23C18/38
Inventor 江奇蒋雪朱德贵卢晓英
Owner SOUTHWEST JIAOTONG UNIV
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