A kind of magnetic levitation train brake pad material and its preparation method

Abstract

The invention provides a brake pad material for a maglev train, the raw materials of which include pre-alloyed powder, MoS 2 Powder, Mo 2 o 3 powder, Cr powder, SiO 2 powder and scaly graphite, and the pre-alloyed powder is a combination of any two of Fe-Al powder, Fe-Cu powder and Cu-Al powder. The present invention also provides a preparation method of the above-mentioned magnetic levitation train brake pad material. The magnetic levitation train brake pad material of the present invention comprehensively utilizes the advantages of Fe, Al and Cu, solves the problem of high cost of the magnetic levitation train brake pad in the prior art, and the prepared brake pad material has a stable friction coefficient and wear resistance The advantages of good performance can ensure the safe braking of maglev trains.

Description

technical field [0001] The invention belongs to the technical field of brake pads, and in particular relates to a brake pad material for a magnetic levitation train and a preparation method thereof. Background technique [0002] Medium and low-speed maglev rail transit has the advantages of high environmental protection, good safety, strong climbing ability, small turning radius, low construction cost and good operating efficiency, and can be applied to urban urban areas, short-distance inter-city transportation and tourist attractions. connect. The rail processing, installation accuracy and track alignment of the train will directly affect the stability of the train running. The track of the medium and low-speed maglev train is different from the ordinary wheel rail, and the F-shaped steel guide rail is used. Taking the first medium-low speed maglev line in China with completely independent intellectual property rights - Changsha Maglev Express Line as an example, the mate...

AI Technical Summary

Problems solved by technology

Fe-based powder metallurgy materials have excellent friction properties at high temperatures and can be used in the range of 400-1000 ° C. However, Fe-based powder metallurgy materials have a considerable amount of material wear at low speeds, and due to the affinity between the material and the Fe-based dual , prone to adhesive wear, and the friction coefficient fluctuates greatly

CN102294482B discloses an iron-copper-based powder alloy brake pad and a preparation method thereof. The powder materials include copper powder, iron powder, tin powder, molybdenum powder, silicon carbide, lead powder, molybdenum disulfide and scaly graphite. Pretreatment of raw materials, batching, mixing, pressing, sintering, cooling and machining to form fan-shaped powder alloy friction parts, which are paired with heat-resistant alloy steel or wear-resistant cast iron to form a friction couple, suitable for aircraft multi-disc brakes, or Brakes and clutches for heavy vehicles, but the invention offers a higher cost of materials

The material can be pressurized and sintered in a protective atmosphere by powder metallurgy. The invention uses Cu-Ni-Ti alloy components as the connecting phase and mullite as the friction phase, which solves the dynamic and static friction of ordinary copper-based brake materials. The problem of low coefficient overcomes the problem of poor corrosion resistance of ordinary copper-based powder metallurgy brake materials in marine environments, but the cost is still high

C / C composite materials have high elastic modulus, good heat conduction and heat resistance, high power absorption per unit area, and low specific gravity. However, the current carbon fiber output is small and expensive, and the friction performance of C / C composite materials is greatly affected by environmental factors. , which also greatly limits the application of C / C composite materials. At present, the brake pads used in the Changsha Maglev Express Line are made of C / C composite materials, and the train operating costs are high.

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