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A method of preparing powder metallurgy copper-based friction material by bonding process

A powder metallurgy and friction material technology, which is applied in the field of preparing copper-based high-speed train brake pads by powder metallurgy process, can solve the problems of uneven compressive stress distribution, uneven porosity distribution, unstable friction coefficient, etc. Wear properties, uniform density distribution, reduced pressure gradient effect

Active Publication Date: 2018-11-06
山东鲁银新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large difference in the physical properties of various additive components, the simple mixing method cannot make the various powders mix uniformly during the mixing process, and the compressive stress distribution of the green compact is uneven during the cold pressing process. , resulting in uneven distribution of porosity, which eventually leads to unstable friction coefficient and uneven wear amount of copper-based powder metallurgy brake pads during the friction process, which directly affects the performance of friction materials

Method used

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  • A method of preparing powder metallurgy copper-based friction material by bonding process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Prepare raw materials: the mass ratio is 60% pure electrolytic copper powder (150 μm), 7% tin powder (25 μm), 7% iron powder (25 μm), 3% nickel powder (25 μm), 5% silicon dioxide powder ( 25μm), 2% bismuth powder, 7% graphite powder, 2% molybdenum disulfide, 7% mullite;

[0018] 2. Pour the above powder into the improved double-cone mixer. The mixing cylinder rotates continuously to stir the material. The high-pressure gas pressure is 0.1MPa. The sprayed adhesive lubricant solution forms a mist, which is fully mixed with the stirred material. Contact, mixing for 5 hours;

[0019] 3. Cold press the uniformly mixed powder in a mold with a pressure of 400MPa;

[0020] 4. Sinter the cold green body in a hot-press sintering furnace, heat it to 950°C, sinter in a hydrogen-nitrogen mixed gas, keep it warm for 80 minutes, and keep the hot-pressing pressure at 2MPa constant;

[0021] 5. Cool to below 100°C and take out, keep the pressure constant during the cooling process....

Embodiment 2

[0023] 1. Prepare raw materials: the mass ratio is 65% pure electrolytic copper powder (130 μm), 7% tin powder (25 μm), 7% iron powder (25 μm), 3% nickel powder (25 μm), 2% silicon dioxide powder ( 25μm), 7% graphite powder, 2% molybdenum disulfide, 7% mullite;

[0024] 2. Pour the above powder into the improved double-cone mixer. The mixing cylinder rotates continuously to stir the material. The high-pressure gas pressure is 0.08MPa. The sprayed adhesive lubricant solution forms a mist, which is fully mixed with the stirred material. Contact, mixing for 6 hours;

[0025] 3. Cold press the uniformly mixed powder in a mold with a pressure of 400MPa;

[0026] 4. Sinter the cold green body in a hot-press sintering furnace, heat it to 900°C, sinter it in a hydrogen-nitrogen mixed gas, keep it warm for 100 minutes, and keep the hot-pressing pressure constant at 2.5MPa;

[0027] 5. Cool to below 100°C and take out, keep the pressure constant during the cooling process.

Embodiment 3

[0029] 1. Prepare raw materials: the mass ratio is 70% pure electrolytic copper powder (120 μm), 7% tin powder (18 μm), 4% iron powder (18 μm), 3% nickel powder (18 μm), 2% silicon dioxide powder ( 18μm), 7% graphite powder, 2% molybdenum disulfide, 5% mullite;

[0030] 2. Pour the above powder into the improved double-cone mixer. The mixing cylinder rotates continuously to stir the material. The high-pressure gas pressure is 0.06MPa. The sprayed adhesive lubricant solution forms a mist, which is fully mixed with the stirred material. Contact, mixing for 7 hours;

[0031] 3. The uniformly mixed powder is cold-pressed, and the pressure is 450MPa;

[0032] 4. Sinter the cold green body in a hot-press sintering furnace, heat it to 850°C, sinter it in a hydrogen-nitrogen mixed gas, keep it warm for 120 minutes, and keep the hot-pressing pressure at 3MPa constant;

[0033] 5. Cool to below 100°C and take out, keep the pressure constant during the cooling process.

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Abstract

The invention discloses a method for preparing a powder metallurgy copper-based friction material by a bonding process, which belongs to the technical field of preparing copper-based high-speed train brake pads by a powder metallurgy process. The mass fraction of copper powder in the raw material powder is 60-75%, the particle size is 100-150 μm, the particle size of iron powder is 10-25 μm, the particle size of nickel powder is 10-25 μm, the particle size of tin powder is 10-25 μm, and the particle size of SiO2 is 10 -25 μm. During the mixing process, a bonding lubricant is added, and a double-cone spray bonding treatment is carried out, so that the fine powder is evenly coated on the surface of the large-sized copper powder particles, and the powder is mixed evenly in proportion and then cold-pressed. After hot pressing and sintering, a copper-based powder metallurgy brake pad prepared by a bonding process is obtained. Compared with the traditional brake pad preparation process, the bonding process can enhance the uniformity of powder mixing, reduce the pressure gradient of the powder during the filling process, improve the uniformity of material shrinkage during the sintering process, and make the material composition , The density distribution is more uniform, and the prepared powder metallurgy copper-based friction material can have better friction and wear performance.

Description

technical field [0001] The invention belongs to the technical field of preparing copper-based high-speed train brake pads by powder metallurgy technology, and particularly provides a method for preparing powder metallurgy copper-based friction materials by bonding technology. Background technique [0002] Copper-based powder metallurgy friction materials are based on copper, adding matrix strengthening components (Fe, Ni, Mo, Ti, Sn, Zn, P, etc.), friction components (SiO 2 、A1 2 o 3 , SiC, asbestos, metal, ZrO 2 and other non-metallic oxides, carbides, nitrides) and lubricating components (graphite, MoS 2 , CaF 2 、WS 2 , B 4 C, BN, Pb, Bi, etc.) sintered materials. Copper-based powder metallurgy brake pads exhibit good comprehensive friction and wear properties in the braking process under the combined action of the above components after mixing, cold pressing and sintering, and are currently widely used high-speed train brake pad materials. However, due to the larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10
CPCC22C1/0425C22C1/05B22F2999/00B22F1/102
Inventor 曲选辉张鹏章林刘婷婷方智
Owner 山东鲁银新材料科技有限公司