Continuous air pressure sintering method for copper-based composite material friction block

A copper-based composite material and air pressure sintering technology, which is applied in the field of train braking systems, can solve problems such as the inability to achieve continuous sintering, and achieve the effects of facilitating the friction coefficient, overcoming fluctuations and differences, and stabilizing the friction coefficient

Active Publication Date: 2013-12-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air pressure sintering of the above ceramic materials is intermittent sintering, and the sintering pressure is usually above 20MPa, and continuous sintering cannot be realized.

Method used

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  • Continuous air pressure sintering method for copper-based composite material friction block
  • Continuous air pressure sintering method for copper-based composite material friction block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh copper powder, iron powder, flake graphite, molybdenum disulfide, alumina, and chromite according to the formula requirements, and the ratio of copper to iron is 6:1. After the ingredients are uniformly mixed and cold pressed into shape, it is ready for continuous gas pressure sintering. Adjust the operating speed of the continuous sintering equipment to 35mm / min, the sintering temperature to 780°C, and the holding time to 180min. Adjust the gas pressure in the furnace chamber to 0.5MPa, which is composed of hydrogen and nitrogen in a volume ratio of 1:2. Place the sample and the transmission device in such a way that the horizontal distance between the samples is 1.5 times the cross-sectional area of ​​the sample, and the vertical distance is 2 times the cross-sectional area of ​​the sample. The sample is sintered into the furnace with the transmission device. After passing through the preheating zone, low temperature zone, high temperature zone, and cooling zon...

Embodiment 2

[0016] Weigh copper powder, iron powder, flake graphite, molybdenum disulfide, alumina, and chromite according to the formula requirements, and the ratio of copper to iron is 6:1. After the ingredients are uniformly mixed and cold pressed into shape, it is ready for continuous gas pressure sintering. Adjust the operating speed of the continuous sintering equipment to 45mm / min, the sintering temperature to 890°C, and the holding time to 120min. Adjust the gas pressure in the furnace chamber to 1MPa, which is composed of hydrogen and nitrogen in a volume ratio of 1:4. Place the sample and the transmission device in such a way that the horizontal distance between the samples is 1.5 times the cross-sectional area of ​​the sample, and the vertical distance is 2 times the cross-sectional area of ​​the sample. The sample is sintered into the furnace with the transmission device. After passing through the preheating zone, low temperature zone, high temperature zone, and cooling zone ...

Embodiment 3

[0018] Weigh copper powder, iron powder, flake graphite, molybdenum disulfide, alumina, and chromite according to the formula requirements, and the ratio of copper to iron is 4:1. After the ingredients are uniformly mixed and cold pressed into shape, it is ready for continuous gas pressure sintering. Adjust the operating speed of the continuous sintering equipment to 80mm / min, the sintering temperature to 960°C, and the holding time to 60min. Adjust the gas pressure in the furnace chamber to 1MPa, which is composed of hydrogen and nitrogen in a volume ratio of 1:5. Place the sample and the transmission device in such a way that the horizontal distance between the samples is 1.5 times the cross-sectional area of ​​the sample, and the vertical distance is 2 times the cross-sectional area of ​​the sample. The sample is sintered into the furnace with the transmission device. After passing through the preheating zone, low temperature zone, high temperature zone, and cooling zone i...

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Abstract

The invention relates to a continuous air pressure sintering method for a copper-based composite material friction block, and belongs to the field of train braking systems. The copper-based composite material friction block is composed of copper powder, ferrous powder, flake graphite, molybdenum disulfide, aluminum oxide and chromite. All components are mixed uniformly and formed by cold-pressing; and then blanks are sintered by using continuous sintering equipment. In the sintering process, air pressure sintering is employed; a gas pressure in a furnace chamber is 0.5-3 MPa; and the gas is formed by mixing hydrogen and nitrogen. The continuous air pressure sintering method overcomes fluctuation and difference of sample performance among batches caused by conventional intermittent sintering with a bell type furnace or a hot-pressing furnace, prevents energy consumption of repeatedly heating and cooling among the bathes in the intermittent sintering. A prepared material has density uniformity and structure continuity in all directions, and is beneficial to stabilize friction performance and absorb sound and reduce noise. The performance of a product obtained by the continuous air pressure sintering method is superior to that of a product obtained by the conventional sintering method. The continuous air pressure sintering method is low in production cost and high in production efficiency and can realize large-scale production easily.

Description

technical field [0001] The invention relates to a preparation process of a copper-based composite material friction block for a high-speed train, belonging to the field of train braking systems. technical background [0002] Copper-based composite material friction block is a key component of high-speed train disc brakes. It is composed of a copper-based friction body connected to a steel back that acts as a strength support, and is connected to the assembly back plate through a steel connector with a special structure. Form a complete brake pad. The copper-based friction body is made of copper powder as the main body, and various friction adjustment components such as alloy powder, ceramic powder, and lubricating powder are added. After three main processes of mixing, molding, and sintering, it is made into a friction coefficient with high stability and thermal conductivity. Good, high heat capacity, high temperature resistance, rain and snow resistant composite material. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05
Inventor 燕青芝王晔
Owner UNIV OF SCI & TECH BEIJING
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