Method for preparing powder metallurgy copper-based friction material through adhesion process

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

Active Publication Date: 2017-11-07
山东鲁银新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing powder metallurgy copper-based friction material through adhesion process
  • Method for preparing powder metallurgy copper-based friction material through adhesion process

Examples

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 through an adhesion process, and belongs to the technical field of preparation of a copper-based high-speed train brake block through a powder metallurgy process. The mass fraction of copper powder in the raw material powder is 60-75%, the grain size of the copper powder is 100-150 [mu]m, the grain size of iron powder is 10-25 [mu]m, the grain size of nickel powder is 10-25 [mu]m, the grain size of tin powder is 10-25 [mu]m, and the grain size of SiO2 is 10-25 [mu]m. Adhesion lubricating agents are added in the mixing process, double-cone spray adhesion treatment is conducted, and accordingly the surfaces of large-granularity copper powder particles are evenly wrapped with fine iron powder, the powder is mixed evenly in proportion and then subjected to cold compression molding, and after hot pressed sintering, the copper-based powder metallurgy brake block prepared by the adhesion process is obtained. Compared with a traditional brake block preparation process, the adhesion process can enhance the powder mixing uniformity, the pressure gradient on the powder in the filling process is reduced, the shrinkage uniformity of the material in the sintering process is improved, and therefore the material component and density distribution are more uniform, and the prepared powder metallurgy copper-based friction material can have the better frictional 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 Applications(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
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