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Brake pad friction plate manufactured by powder metallurgy and used for high-speed train and preparation process of brake pad friction plate

A technology of powder metallurgy and high-speed trains, applied in the direction of friction linings, mechanical equipment, etc., can solve the problems of reduced friction performance, difficulty in application of instability, insufficient braking force, etc., to improve wear resistance and heat resistance, improve mechanical Strength and braking performance, effect of extending service life

Inactive Publication Date: 2012-07-25
锦州捷通铁路机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon fiber composite brake pads and ceramic composite brake pads have excellent technical potential, their high production costs and instability make it difficult to apply them to high-speed trains
[0004] Existing powder metallurgy brake pads cannot form the alloying and diversification of friction components. Excessive SiO2 is reduced and dissolved in iron, which causes the content of iron carbide to decrease, thereby reducing friction performance. Its products have insufficient braking force, poor reliability, and use Technical defects such as short service life and large damage to the brake disc are mainly suitable for ordinary speed-up trains, and the braking of high-speed trains with a speed higher than 300km / h cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The raw material composition of the brake pad friction plate (percentage by weight): 66% copper, 5% zinc, 10% iron, 7% graphite, 6% lead powder, 3% silicon dioxide, and 3% silicon carbide.

[0031] The preparation process is as follows:

[0032] 1. Raw material pretreatment, grinding copper, zinc, iron, graphite, lead powder, silicon dioxide, and silicon carbide into powder respectively, and performing drying pretreatment at a drying temperature of 100°C for 5 hours;

[0033] 2. Batching and mixing, according to the weight percentage, copper 66%, zinc 5%, iron 10%, graphite 7%, lead powder 6%, silicon dioxide 3%, silicon carbide 3%, weigh a total amount of 30kg baking powder Mix the dry ingredients evenly with a V-shaped mixer;

[0034] 3. Compression molding, the mixture is pressed into a compact with a pressing force of 380 MPa, and a steel back is made of No. 20 steel plate with a thickness of 2.5 mm, and the compact is fixed on the steel back. The steel back is mad...

Embodiment 2

[0040] The raw material composition of the brake pad friction plate (percentage by weight): 70% copper, 4% zinc, 9% iron, 7% graphite, 5% lead powder, 2% silicon dioxide, and 3% silicon carbide.

[0041] The preparation process is as follows:

[0042] 1. Raw material pretreatment, the raw material is ground into powder respectively, and then dried and pretreated, the drying temperature is 120°C, and the temperature is kept for 3 hours;

[0043] 2. For batching and mixing, take the dried raw materials with a total amount of 30kg according to the weight percentage, and mix them evenly with a V-type agitator;

[0044] 3. Compression molding, the mixture is pressed into a compact with a pressing force of 600 MPa, and a steel back is made of No. 20 steel plate with a thickness of 2.5 mm, and the compact is fixed on the steel back. The steel back is made of No. 20 steel (also low alloy steel);

[0045] 4. For sintering treatment, the normal pressure is raised to 860°C, the pressur...

Embodiment 3

[0050] The raw material composition of the brake pad friction plate (weight percentage): 68% copper, 4% zinc, 10% iron, 8% graphite, 5% lead powder, 2% silicon dioxide, and 3% silicon carbide.

[0051] The preparation process is as follows:

[0052] 1. Raw material pretreatment, the raw material is ground into powder separately, and then dried and pretreated, the drying temperature is 110°C, and the temperature is kept for 4 hours;

[0053] 2. For batching and mixing, take the dried raw materials with a total amount of 30kg according to the weight percentage, and mix them evenly with a V-type agitator;

[0054] 3. Compression molding, the mixture is pressed into a compact with a pressing force of 450 MPa, and a steel back is made of No. 20 steel plate with a thickness of 2.5mm, and the compact is fixed on the steel back. The steel back is made of No. 20 steel (also low alloy steel);

[0055] 4. For sintering treatment, the normal pressure is raised to 830°C, the pressure in ...

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Abstract

The invention discloses a brake pad friction plate manufactured by powder metallurgy and used for a high-speed train and a preparation process of the brake pad friction plate. The brake pad friction plate comprises the following components in percentage by weight: 65-70% of copper, 3-5% of zinc, 8-10% of iron, 5-8% of graphite, 2-6% of lead powder, 1-3% silicon dioxide and 1-4% of silicon carbide. The preparation process comprises the following steps: (1) preprocessing raw materials: grinding into powder, and baking; (2) preparing and mixing the materials; (3) carrying out compression moulding: compressing a mixture into a pressed shape; (4) sintering: heating the pressed shape to 800-900 DEG C at a constant pressure, holding the temperature, controlling a heat preservation pressure to be 1.3-2.0MPa, and feeding hydrogen to protect; (5) cooling: naturally cooling the pressed shape to below 100 DEG C in the hydrogen, and discharging; and (6) carrying out mechanical processing. By the brake pad friction plate provided by the invention, a friction component is led to be alloyed and diversified, so that the wear-resisting and heat-resisting performances of the friction plate are improved, therefore, not only the matrix strength of the materials is ensured, but also the friction plate has good thermophysical properties and stable friction properties, and the service life and the brake performance of the brake pad can be remarkably improved.

Description

technical field [0001] The invention relates to the field of powder metallurgy brake pads for braking, in particular to a powder metallurgy brake pad friction pad for high-speed trains and a preparation process thereof. Background technique [0002] At present, my country's commercial high-speed train powder metallurgy brake pads are purchased from foreign products, and so far no powder metallurgy brake pads for high-speed trains in my country have been put into use. In order to reduce the cost of using the braking system of high-speed trains, the Ministry of Railways proposed to accelerate the development of powder metallurgy brake pads for domestic high-speed trains. [0003] The types of brake pads mainly include synthetic brake pads, powder metallurgy brake pads, carbon fiber composite material brake pads and ceramic composite material brake pads. Since the temperature of the brake disc and the brake pad is above 500°C when the high-speed train is braking, it can reach ...

Claims

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Application Information

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IPC IPC(8): C22C9/00B22F3/16B22F5/00F16D69/02
Inventor 周素霞苗昕旺伊泽健李常金
Owner 锦州捷通铁路机械股份有限公司
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