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Composite coating material applied to semi-metal iron-based brake pads and preparation method for composite coating material

A composite coating, brake pad technology, applied in metal material coating process, metal processing equipment, coating and other directions, can solve the problem of high price of new materials and preparation process, unstable friction performance of brake pads, and utilization of new brake pad materials. problems such as low rate, to achieve the effects of easy control of process parameters, beneficial environmental protection, and low equipment cost

Active Publication Date: 2018-06-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the action of high temperature, the brake pads are likely to cause unstable friction performance, increased wear, and high temperature failure.
Generally, the service life of the brake pad is 1 / 3 of its thickness, and the preparation of the composite coating on the surface of the brake pad can well reduce the damage and short life of the semi-metallic brake pad.
[0004] Popa et al. used different material ratios to prepare brake brake pad composite braking technology, replaced the classic material cast iron with new materials, improved the overall performance of disc brake pads and reduced noise, but the price of new materials and preparation processes in the whole process was too high. The utilization rate of new materials for brake pads is low
Patent CN 10519892 A discloses a heat-resistant powder coating with sand grain effect applied to brake pads and its preparation method. The powder coating formula is selected to prepare a film-forming material with excellent performance and the method of adding a special high-temperature-resistant inorganic pigment is used to prepare a heat-resistant powder coating. Coating solves the problem of easy softening and falling off of brake pads, and improves the safety performance of brake pads. However, the process of preparing sand grain effects is complicated, and adding heat-resistant powders are all inorganic materials, which tends to have low friction coefficient and poor braking effect.
Patent CN106591765 discloses a preparation method of an erosion-resistant and wear-resistant iron-based composite coating. The composite coating is prepared on the surface of the substrate, which has high bonding force with the substrate, good coating compactness and anti-oxidation performance. However, the preparation process requires After substrate surface treatment, mesh division, mesh cladding layer, substrate surface secondary treatment, preparation of composite coating and other processes are relatively complicated, the parameters are not well controlled, and invalid products are easy to be produced.

Method used

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  • Composite coating material applied to semi-metal iron-based brake pads and preparation method for composite coating material
  • Composite coating material applied to semi-metal iron-based brake pads and preparation method for composite coating material
  • Composite coating material applied to semi-metal iron-based brake pads and preparation method for composite coating material

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Experimental program
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Effect test

Embodiment 1

[0039] A composite coating material applied to semi-metallic iron-based brake pads, the preparation method of which comprises the following steps:

[0040] 1) Weigh nickel-chromium powder, chromium carbide cermet powder, ferrosilicon powder, vanadium-iron powder, aluminum powder and graphene as raw materials according to the mass ratio of 45:18:6:5:25:1;

[0041] 2) Place the weighed raw materials in a vibrating mixer for vibratory mixing. The vibration frequency used is 50 Hz, the vibration force is 9000 N, and the vibration time is 30 minutes. The raw materials are fully mixed, and then melted at high temperature to obtain molten Metal liquid; high-temperature melting process parameters: vacuum degree of high-temperature vacuum furnace <0.01MPa, protective gas is argon, temperature is 1800°C, holding time is 30min;

[0042] 3) The molten metal liquid obtained in step 2) is mixed and atomized with water and gas, and the diameter is controlled at 60-80 μm (as follows image 3...

Embodiment 2

[0048] A composite coating material applied to semi-metallic iron-based brake pads, the preparation method of which comprises the following steps:

[0049] 1) Weigh nickel-chromium powder, chromium carbide cermet powder, ferrosilicon powder, vanadium-iron powder, aluminum powder and graphene as raw materials according to the mass ratio of 40:16:7.5:5:30:1.5;

[0050] 2) Place the weighed raw materials in a vibrating mixer for vibratory mixing. The vibration frequency used is 50 Hz, the vibration force is 10000 N, and the vibration time is 30 minutes. The raw materials are fully mixed, and then melted at high temperature to obtain molten Metal liquid; high-temperature melting process parameters: vacuum degree of high-temperature vacuum furnace <0.01MPa, protective gas is argon, temperature is 1650°C, holding time is 40min;

[0051] 3) The molten metal liquid obtained in step 2) is mixed and atomized with water and gas, and the diameter is controlled at 70-90 μm (as follows im...

Embodiment 3

[0057] A composite coating material applied to semi-metallic iron-based brake pads, the preparation method of which comprises the following steps:

[0058] 1) Weigh nickel-chromium powder, chromium carbide cermet powder, ferrosilicon powder, vanadium-iron powder, aluminum powder and graphene as raw materials according to the mass ratio of 50:15:8:5:20:2;

[0059] 2) Place the weighed raw materials in a vibrating mixer for vibratory mixing. The vibration frequency used is 50 Hz, the vibration force is 11000 N, and the vibration time is 30 minutes. The raw materials are fully mixed and then melted at a high temperature to obtain a molten Metal liquid; high-temperature melting process parameters: vacuum degree of high-temperature vacuum furnace <0.01MPa, protective gas is argon, temperature is 1750°C, holding time is 35min;

[0060] 3) The molten metal liquid obtained in step 2) is mixed and atomized with water and gas, and the diameter is controlled at 85-100 μm (as follows im...

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Abstract

The invention discloses a composite coating material applied to semi-metal iron-based brake pads. The composite coating material is formed by nickel-chrome alloy powder, chromium carbide powder, ferrosilicon, ferrovanadium, aluminite powder and graphene being subjected to high temperature melting, water vapor mixing atomization, bonding batter-mixing brushing and laser melting. The raw materials comprise the ingredients of, in percentage by mass, 12-50% of nickel-chromium, 15-28% of chromium carbide, 6-10% of ferrosilicon, 5-8% of ferrovanadium, 20-40% of aluminum and 1-2% of graphene. By means of the composite coating material applied to the semi-metal iron-based brake pads and a preparation method for the composite coating material, a metal alloy powder coating formed on the surface of the semi-metal iron-based brake pads has good physical and mechanical performance and has good friction performance and thermal stability under high temperature conditions, and dust after friction is convenient to treat, furthermore, process parameters are easy to control in the preparation process, and the composite coating material applied to the semi-metal iron-based brake pads and the preparation method for the composite coating material are suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of friction materials and their preparation, in particular to a composite coating material applied to semi-metallic iron-based brake pads and a preparation method thereof, and belongs to the field of automobile industry. Background technique [0002] The braking system is one of the key components of the car, and the comprehensive performance of the brake pads directly affects the stability and reliability of the braking system. For brake pads, the choice of friction material basically determines the braking performance of the brake pads. The ideal brake pad friction material should have good stability, appropriate and stable friction coefficient, low wear rate, high braking reliability, low density, long brake pad service life, low noise, and the material source is environmentally friendly, green, Economic benefits and other advantages. At the same time, with the development of high-speed automobiles, mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00C23C24/10C22C30/00C22C32/00
CPCC22C19/05C22C30/00C22C32/0052C23C24/103B22F9/082B22F1/102
Inventor 史晓亮卢冠辰黄玉春刘锡尧邓骁斌闫昭章桥新
Owner WUHAN UNIV OF TECH
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