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High speed train powder metallurgy brake pad and preparation technology thereof

A powder metallurgy, high-speed train technology, applied in the field of brake pads, can solve the problems of inability to meet the braking requirements of high-speed trains, unstable friction coefficient, shortened service life, etc., achieve stable friction coefficient, low noise occurrence probability, and improve friction coefficient. Effect

Active Publication Date: 2010-09-22
SHANDONG GOLD PHOENIX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing conventional braking materials, such as semi-metal-based synthetic materials, cannot meet the needs of speed-up vehicles in terms of friction coefficient, train running stability, wear resistance, thermal conductivity, and braking distance. During the braking process of more than 200Km / h, due to frictional braking, the kinetic energy of the train is almost completely converted into frictional heat, which makes the temperature rise of the friction pair very high, resulting in unstable friction coefficient of the traditional semi-metal-based synthetic brake pads. Aging, cracking, increased wear, and shortened service life cannot meet the braking needs of high-speed trains

Method used

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  • High speed train powder metallurgy brake pad and preparation technology thereof
  • High speed train powder metallurgy brake pad and preparation technology thereof
  • High speed train powder metallurgy brake pad and preparation technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Take 180 kg of copper powder, 12 kg of tin powder, 12 kg of iron powder, 12 kg of graphite, 6 kg of silicon dioxide, 6 kg of zinc powder, 9 kg of molybdenum disulfide, and 6 kg of zircon. The raw material of the brake pad powder is put into the V-shaped mixer and mixed for 30 minutes evenly, then put into the FSP series CNC high-precision powder metallurgy forming press for pressing and forming, and under the protection of ammonia decomposition gas in the mesh belt type powder metallurgy sintering furnace Sintering at 830°C for 30 minutes, after finishing, shaping and repressing, a high-speed train brake pad with stable performance is obtained.

[0072] The physical-mechanical performance of the brake pad that table 1 embodiment 1 provides

[0073]

[0074] The friction coefficient of the brake pad provided by this embodiment is 0.19, the wear is 0.21mm, and when the speed is 300Km / h for emergency braking, the high-temperature performance is stable, the thermal fadin...

Embodiment 2

[0076] Get 210 kilograms of copper powder, 30 kilograms of tin powder, 18 kilograms of iron powder, 27 kilograms of graphite, 9 kilograms of silicon dioxide, 18 kilograms of zinc powder, 15 kilograms of molybdenum disulfide, and 18 kilograms of zircon. The purity of the above-mentioned powder raw materials is respectively Copper powder 99.85%, tin powder 99.8%, iron powder 99%, graphite 99.5%, silicon dioxide 99%, zinc powder 99.7%, molybdenum disulfide 99%, zircon 99%. The particle sizes of the above powders are copper powder 240 mesh; tin powder 350 mesh; iron powder 280 mesh; graphite 220 mesh; silicon dioxide 180 mesh; zinc powder 220 mesh; molybdenum disulfide 180 mesh; zircon 220 mesh. Put the brake pad powder raw material weighed according to the above ratio into the V-shaped mixer and mix the materials evenly for 30 minutes, then put it into the FSP series CNC high-precision powder metallurgy forming press for compression molding, and then put it into the mesh belt type...

Embodiment 3

[0081] Get 200 kilograms of copper powder, 15 kilograms of tin powder, 16 kilograms of iron powder, 20 kilograms of graphite, 7 kilograms of silicon dioxide, 12 kilograms of zinc powder, 10 kilograms of molybdenum disulfide, and 12 kilograms of zircon. The purity of the above-mentioned powder raw materials is respectively Copper powder 99.85%, tin powder 99.8%, iron powder 99%, graphite 99.5%, silicon dioxide 99%, zinc powder 99.7%, molybdenum disulfide 99%, zircon 99%. The particle sizes of the above powders are copper powder 260 mesh, tin powder 300 mesh, iron powder 320 mesh, graphite 180 mesh, silicon dioxide 220 mesh, zinc powder 180 mesh, molybdenum disulfide 220 mesh, and zircon 180 mesh. Put the brake pad powder raw material weighed according to the above ratio into the V-shaped mixer and mix the materials evenly for 30 minutes, then put it into the FSP series CNC high-precision powder metallurgy forming press for compression molding, and then put it into the mesh belt ...

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Abstract

The invention embodiment discloses a high speed train powder metallurgy brake pad. The material of the brake pad comprises the following powder raw material by weight percent: 60 to 70 copper powder, 4 to 10 tin powder, 4 to 6 ferrous powder, 4 to 9 black lead, 2 to 3 silicon dioxide, 2 to 6 zinc powder, 3 to 5 molybdenum disulfide and 2 to 6 zircon. The invention further discloses the preparation technology of the powder metallurgy brake pad. The invention has the advantages that the copper with high thermal conductivity and good plasticity is used to be matrix, tin and zinc are added and alloyed in the sintering process, the sintering temperature is reduced, the abrasion performance is improved, the silicon dioxide and the zircon are added to improve friction coefficient, the black lead and the molybdenum disulfide serve as a lubrication component to protect duality and stabilize the friction coefficient. The abrasion of the brake pad produced through the method on a dual disc is small. The invention has the advantages of stable friction coefficient, small abnormal wear and noise occurrence probability and environmental protection and the brake performance thereof can meet the requirement of the high speed train.

Description

technical field [0001] The invention relates to the technical field of brake pads, in particular to a high-speed train powder metallurgy brake pad and a preparation process thereof. Background technique [0002] Brake pads, also called brake pads, are the most critical safety parts, and the brake pads play a decisive role in the quality of all braking effects. [0003] With the rapid development of the national economy and the continuous improvement of people's living consumption level, the requirements for the convenience and comfort of transportation are also constantly increasing. High-speed trains have become an inevitable trend in the development of train transportation, and the relative safety issues have attracted more and more attention. Existing conventional braking materials, such as semi-metal-based synthetic materials, cannot meet the needs of speed-up vehicles in terms of friction coefficient, train running stability, wear resistance, thermal conductivity, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D69/02B22F3/12
Inventor 孙忠义王春雨徐伟
Owner SHANDONG GOLD PHOENIX
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