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A method for adjusting porosity and pore structure of powder metallurgy copper-based friction material

A technology for friction materials and powder adjustment, which is applied in metal processing equipment, transportation and packaging, etc. It can solve the problems of easy falling off of copper on the surface of iron powder, increase of material porosity, decrease of matrix continuity, etc., and achieve the goal of reducing wear and strength The effect of reducing attenuation and improving uniformity

Active Publication Date: 2019-02-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, iron is directly added to the copper-based friction material in the form of iron powder. Excessive iron powder will split the copper matrix and increase the porosity of the material. Some studies have also proposed to replace iron powder with copper-clad iron powder. Copper-clad iron powder not only The production process is complicated, the cost is high, and the copper on the surface of the iron powder is easy to fall off at high temperature, all of which will reduce the continuity of the matrix, reduce the strength, and increase the wear

Method used

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  • A method for adjusting porosity and pore structure of powder metallurgy copper-based friction material
  • A method for adjusting porosity and pore structure of powder metallurgy copper-based friction material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Prepare raw materials: matrix component: mixed copper powder (35% electrolytic copper powder (45 μm) and 20% copper-iron alloy powder) with a mass ratio of 55%; friction component: 5% SiO 2 Powder (10μm), 9% mullite, 7% Fe powder; strengthening component: 7% Sn powder, 3% Ni powder; lubricating component: 5% Bi powder, 7% flake graphite (150μm), 2% di Molybdenum sulfide powder;

[0019] 2. Pour the above powder into the improved double-cone mixer. The mixing cylinder rotates continuously to turn the material. The high-pressure gas pressure is about 0.1MPa. The sprayed adhesive lubricant solution forms a mist, which is mixed with the turned material Full contact, mixing for 8 hours;

[0020] 3. The uniformly mixed powder is cold-pressed, and the pressure is 400MPa;

[0021] 4. Sinter the cold green body in a hot-press sintering furnace, heat it to 830°C, sinter in a hydrogen-nitrogen mixed gas, keep it warm for 80 minutes, and keep the hot-pressing pressure at 2MPa ...

Embodiment 2

[0024] 1. Prepare raw materials: matrix component: mixed copper powder (30% electrolytic copper powder (60 μm) and 25% copper-iron alloy powder) with a mass ratio of 55%; friction component: 5% SiO 2 Powder (10μm), 9% mullite, 7% Fe powder; strengthening component: 7% Sn powder, 3% Ni powder; lubricating component: 5% Bi powder, 7% flake graphite (150μm), 2% di Molybdenum sulfide powder;

[0025] 2. Pour the above powder into the improved double-cone mixer. The mixing cylinder rotates continuously to stir the material. The pressure of the high-pressure gas is about 0.5MPa. Full contact; mixing for 10 hours;

[0026] 3. The uniformly mixed powder is cold-pressed, and the pressure is 430MPa;

[0027] 4. Sinter the cold green body in a hot-press sintering furnace, heat it to 880°C, sinter in a hydrogen-nitrogen mixed gas, keep it warm for 100 minutes, and keep the hot-pressing pressure at 2.5MPa constant;

[0028] 5. Cool to below 100°C and take out, keep the pressure constant...

Embodiment 3

[0030] 1. Prepare raw materials: matrix component: mixed copper powder (25% electrolytic copper powder (75 μm) and 30% copper-iron alloy powder) with a mass ratio of 55%; friction component: 5% SiO 2 Powder (10μm), 9% mullite, 7% Fe powder; strengthening component: 7% Sn powder, 3% Ni powder; lubricating component: 5% Bi powder, 7% flake graphite (150μm), 2% di Molybdenum sulfide powder;

[0031] 2. Pour the above powder into the improved double-cone mixer. The mixing cylinder rotates continuously to turn the material. The high-pressure gas pressure is about 0.8MPa. Full contact, mixing for 12 hours;

[0032] 3. The uniformly mixed powder is cold-pressed, and the pressure is 470MPa;

[0033] 4. Sinter the cold green body in a hot-press sintering furnace, heat it to 930°C, sinter it in a hydrogen-nitrogen mixed gas, keep it warm for 120 minutes, and keep the hot-pressing pressure at 3MPa constant;

[0034] 5. Cool to below 100°C and take out, keep the pressure constant durin...

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Abstract

The invention provides a method for adjusting the porosity and pore structure of a powder metallurgy copper-based friction material, which belongs to the technical field of brake friction material preparation. The process is as follows: using argon atomization process Cu-Fe alloy powder to partially replace electrolytic copper powder, using the size matching of copper-iron alloy powder (10-240μm) and the improvement of wettability with other powders, through molding and hot pressing sintering A powder metallurgy copper-based friction material is obtained. The number and size of pores in the obtained powder metallurgy copper-based friction material are reduced, the shape is smoother, the pore distribution is more uniform, and a multi-level pore size distribution is formed, which makes the material have better wear resistance, thermal conductivity and more stable. coefficient of friction.

Description

technical field [0001] The invention relates to the technical field of preparation of brake friction materials, and in particular provides a method for adjusting the porosity and pore structure of powder metallurgy copper-based friction materials. Background technique [0002] In addition to the three major components of the powder metallurgy copper-based friction material, the matrix component, the friction component and the lubricating component, the porous structure is an important feature of the powder metallurgy copper-based friction material, and the pores are considered to affect the friction and wear properties of the powder metallurgy friction material. The fourth largest component, porosity, pore size, pore structure and uniformity of pore distribution are all important factors affecting the friction and wear performance of brake pads. Porosity has been regarded as an important performance index of friction materials at home and abroad. Powder metallurgy Copper-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11C22C1/05C22C9/00
CPCC22C1/05C22C9/00B22F3/1103B22F2998/10B22F1/108B22F2003/145B22F3/02
Inventor 曲选辉张鹏章林刘婷婷方智
Owner UNIV OF SCI & TECH BEIJING