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A kind of preparation method of high thermal conductivity copper-based brake pad with orientation structure

A brake pad, high thermal conductivity technology, applied in chemical instruments and methods, friction linings, mechanical equipment, etc., can solve the problems of poor bonding force, interface defects, poor thermal conductivity of copper-based brake pads, etc., to improve the interface force , the effect of reducing defects and porosity, and improving mechanical properties

Active Publication Date: 2020-11-03
NANYANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Graphite and copper are completely non-wetting, and the bonding force between the two is relatively poor, resulting in defects in the interface, which makes the thermal conductivity of copper-based brake pads containing graphite relatively poor

Method used

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  • A kind of preparation method of high thermal conductivity copper-based brake pad with orientation structure
  • A kind of preparation method of high thermal conductivity copper-based brake pad with orientation structure
  • A kind of preparation method of high thermal conductivity copper-based brake pad with orientation structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this embodiment, the preparation method of the high thermal conductivity copper-based brake pad with an orientation structure is as follows:

[0045] (1) 18wt% of flake graphite, 3wt% of sodium carboxymethyl cellulose, and 79wt% of water were mixed uniformly, and ultrasonically dispersed after stirring;

[0046] (2) prepare the copper sulfate aqueous solution of concentration 2wt%;

[0047] (3) Using monofilament spinning equipment, the propulsion speed is 0.5ml / min, and the spinning solution in step 1 is precipitated in the coagulation solution in step 2 to prepare fibers;

[0048] (4) Dry the prepared fiber at room temperature after winding, and then place it in an oven at 80°C for 24 hours;

[0049] (5) The base material adopts 80wt% copper powder, 15wt% iron powder, 0.6wt% chromium powder, 1wt% nickel powder, 2wt% molybdenum disulfide, 1wt% silicon carbide, 0.4wt% glycerin, and mix them evenly become a paste.

[0050] (6) Take 10wt% of fibers in step 4 and 90w...

Embodiment 2

[0056] In this embodiment, the preparation method of the high thermal conductivity copper-based brake pad with an orientation structure is as follows:

[0057] (1) 18wt% of flake graphite, 5wt% of polyvinylpyrrolidone, and 77wt% of water were mixed uniformly, and ultrasonically dispersed after stirring;

[0058] (2) prepare the copper acetate ethanol solution of concentration 5wt%;

[0059] (3) Using monofilament spinning equipment, the propulsion speed is 0.5ml / min, and the spinning solution in step 1 is precipitated in the coagulation solution in step 2 to prepare fibers;

[0060] (4) Dry the prepared fiber at room temperature after winding, and then place it in an oven at 80°C for 24 hours;

[0061] (5) The base material adopts 80wt% copper powder, 15wt% iron powder, 0.6wt% chromium powder, 1wt% nickel powder, 2wt% molybdenum disulfide, 1wt% silicon carbide, 0.4wt% glycerin, and mix them evenly become a paste.

[0062] (6) Take 20wt% of fibers in step 4 and 80wt% of base...

Embodiment 3

[0068] In this embodiment, the preparation method of the high thermal conductivity copper-based brake pad with an orientation structure is as follows:

[0069] (1) Mix 18wt% of flake graphite, 1wt% of dopamine hydrochloride, and 81wt% of water, and ultrasonically disperse after stirring;

[0070] (2) prepare the copper nitrate ammonia solution of concentration 8wt%;

[0071] (3) Using monofilament spinning equipment, the propulsion speed is 0.5ml / min, and the spinning solution in step 1 is precipitated in the coagulation solution in step 2 to prepare fibers;

[0072] (4) Dry the prepared fiber at room temperature after winding, and then place it in an oven at 80°C for 24 hours;

[0073] (5) The base material adopts copper powder 85wt%, 10wt% iron powder, 1wt% chromium powder, 0.6wt% nickel powder, silicon dioxide 1wt%, aluminum oxide 2wt%, glycerin 0.4wt%, will Mix well to form a paste.

[0074] (6) Get 15wt% of fibers in step 4 and 85wt% of base paste in step 5, arrange th...

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Abstract

The invention belongs to the field of high-speed-rail braking systems and particularly relates to a preparing method for a high-heat-conduction copper-based brake pad with an orientation structure. Bymeans of the method, copper is adopted as the base body, iron and an alloy of iron are adopted as base body strengthening components, graphite and the like are adopted as lubricating components, andaluminum oxide, silicon dioxide and the like are adopted as friction components. Firstly, a polymer solution is pre-mixed with powder such as graphite to form liquid; then a spinning method is used for preparing the liquid into fibers, the powder such as graphite is dispersed, and spinning liquid flowing orientation is used for achieving orientation arrangement of the powder such as graphite; thenthe orientation structure is fixed through sizing of a solidification solution containing copper salt; and then the fibers formed by the powder such as graphite are arranged and are then mixed with base body materials such as copper powder, and a re-pressing and re-combusting technology is used for preparing the copper-based brake pad with high density, high interface bonding strength and high orientation structure. By means of the method, the heat conduction coefficient of the copper-based brake pad is improved, the shear strength is improved, the wear resistance and the stable friction coefficient are improved, and therefore the use performance of the copper-based brake pad is improved.

Description

technical field [0001] The invention belongs to the field of high-speed rail braking systems, in particular to a method for preparing a copper-based brake pad with an orientation structure and high thermal conductivity, which is suitable for braking friction materials for high-speed and heavy-duty vehicles. Background technique: [0002] The braking of high-speed trains is accomplished through the braking torque formed by the friction generated between the friction pairs. During the braking process, the frictional braking torque converts the kinetic energy of the high-speed train into heat energy, resulting in a friction surface temperature of the brake pads as high as 700°C. At present, copper-based powder metallurgy friction materials with good thermal conductivity and heat resistance are used, which can make It is well adapted to high-speed trains around 300km / h. [0003] Graphite is an anisotropic material with a thermal conductivity of up to 1000w / (mK) along its length...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D69/02C09K5/14
CPCC09K5/14F16D69/02F16D69/028F16D2200/0026F16D2200/0073F16D2200/0086
Inventor 黄亚平薛艳王莹田进军
Owner NANYANG INST OF TECH