Powder metallurgy friction material for new-generation high-speed motor train unit and preparation method of powder metallurgy friction material

A technology of high-speed EMUs and powder metallurgy, which is applied in the fields of climate sustainability, railway transportation, railway transportation, etc., can solve the problems of the new generation of high-speed EMUs with a speed of 400 kilometers per hour, the abnormal wear of friction pairs, and the reduction of friction coefficients. and other problems, to avoid abnormal wear, enhance strength, improve mechanical properties and wear resistance

Pending Publication Date: 2022-08-09
BEIJING RAILWAY STAR FORTUNE HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The increase in the operating speed of the EMU puts forward more stringent requirements for its braking performance, especially in the high-speed operating state, the increase in speed will increase the braking temperature and wear of the friction material geometrically, which will easily lead to friction Due to problems such as material melting, friction coefficient reduction, and abnormal wear of friction pairs, the existing powder metallurgy friction materials for EMUs are difficult to meet the needs of a new generation of high-speed EMUs with a speed of 400 kilometers per hour. Powder metallurgy friction materials and their preparation methods for EMUs have become a key technical issue

Method used

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  • Powder metallurgy friction material for new-generation high-speed motor train unit and preparation method of powder metallurgy friction material
  • Powder metallurgy friction material for new-generation high-speed motor train unit and preparation method of powder metallurgy friction material
  • Powder metallurgy friction material for new-generation high-speed motor train unit and preparation method of powder metallurgy friction material

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Embodiment approach

[0031] (1) The low-loose ratio electrolytic copper powder is dendritic, and the bulk density is preferably 0.8-1.0g / cm 3 , the particle size is preferably not more than 75μm, and its specific surface area is preferably more than 3000cm 2 / g, while the specific surface area of ​​ordinary electrolytic copper powder is only 1000 ~ 1800cm 2 / g, therefore, the electrolytic copper powder with low bulk ratio in the present invention has good plastic deformation ability, which is favorable for cold pressing, and the high surface energy brought by the high specific surface area has a stronger sintering driving force. In practical applications, the electrolytic copper powder with low bulk ratio used in the present invention can be the electrolytic copper powder with low bulk ratio that can be purchased through commercial means in the prior art.

[0032] (2) The copper-coated reduced iron powder is spongy, the iron content is preferably 80wt% to 90wt%, and the particle size is preferably...

Embodiment 1

[0052] A powder metallurgy friction material for a new generation of high-speed EMUs is made of the following components in parts by mass: 58 parts of low-porosity electrolytic copper powder, 13 parts of copper-coated reduced iron powder, 5 parts of chromium alloy powder, and manganese sulfide ore. 1 part of powder, 5 parts of C / C-SiC abrasive powder, 2 parts of basalt fiber, 3 parts of magnesium oxide powder, 11 parts of graphite powder, and 2 parts of coke powder.

[0053] Specifically, the low-loose ratio electrolytic copper powder is dendritic, and the bulk density is 0.8-1.0g / cm 3 , the particle size is not more than 75μm, and its specific surface area exceeds 3000cm 2 / g. The copper-coated reduced iron powder is sponge-like, has an iron content of 80-90 wt%, and a particle size of 45-180 μm. The manganese sulfide ore powder adopts manganese sulfide primary ore powder, the particle size is not more than 15 microns, and the MnS weight ratio is 40% to 60%. The C / C-SiC ab...

Embodiment 2

[0061] A powder metallurgy friction material for a new generation of high-speed EMUs is made of the following components in parts by mass: 60 parts of low-porosity electrolytic copper powder, 15 parts of copper-coated reduced iron powder, 3 parts of chromium alloy powder, and manganese sulfide ore. 1 part of powder, 3 parts of C / C-SiC abrasive powder, 3 parts of basalt fiber, 2 parts of magnesium oxide powder, 10 parts of graphite powder, and 3 parts of coke powder.

[0062] Specifically, the low-loose ratio electrolytic copper powder is dendritic, and the bulk density is 0.8-1.0g / cm 3 , the particle size is not more than 75μm, and its specific surface area exceeds 3000cm 2 / g. The copper-coated reduced iron powder is sponge-like, the iron content is 80wt%-90wt%, and the particle size is 45-180μm. The manganese sulfide ore powder adopts manganese sulfide primary ore powder, the particle size is not more than 15 microns, and the MnS weight ratio is 40% to 60%. The C / C-SiC ab...

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Abstract

The invention discloses a powder metallurgy friction material for a new-generation high-speed motor train unit and a preparation method of the powder metallurgy friction material. The powder metallurgy friction material comprises, by mass, 55-65 parts of low-apparent-density electrolytic copper powder, 10-18 parts of copper-coated reduced iron powder, 3-6 parts of chromium alloy powder, 1-3 parts of manganese sulfide mineral powder, 3-6 parts of C/C-SiC abrasive dust powder, 1.5-3 parts of basalt fibers, 2-5 parts of magnesium oxide powder, 9-13 parts of graphite powder and 2-4 parts of coke powder. The preparation method comprises the steps that all the raw materials are mixed to obtain a mixture, then step-by-step cold pressing is conducted, in the first step, a biscuit internally provided with a through hole is obtained through pre-pressing forming, in the second step, the through hole is filled with copper powder for filling, and a formed pressed blank is obtained through pressing forming; and sintering the formed pressed blank. The application upper limit of the powder metallurgy friction material is improved, the friction coefficient of the powder metallurgy friction material under the high-speed working condition is stable, the abrasion loss is low, and the braking requirement of a motor train unit at the speed of 400 kilometers per hour can be fully met.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy friction materials, in particular to a powder metallurgy friction material for a new generation of high-speed EMUs and a preparation method thereof. Background technique [0002] In the new century, my country's high-speed railway has ushered in great development, and the running speed of the EMU has also increased from the initial 160km / h to the current 350km / h, and gradually formed the "Harmony" EMU introduced with technology to the independent intellectual property rights. The transition of the "Fuxing" EMU. By the end of 2020, the operating mileage of high-speed railways across the country has reached 38,000 kilometers, with 3,918 standard EMUs and 31,340 EMUs. In order to improve the efficiency of railway operation and better meet the travel needs of the people, the State Railway Group will carry out research and development of high-speed EMUs with a speed of 400 kilometers per hour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F3/10
CPCB22F3/02B22F3/1007B22F1/12C22C47/14C22C49/14C22C49/02Y02T30/00
Inventor 房冲邹鹏邹怀森
Owner BEIJING RAILWAY STAR FORTUNE HIGH TECH
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