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Preparation method of copper-based friction material with uniformly-distributed ferrum phase

A friction material and uniform distribution technology, applied in chemical instruments and methods, metal processing equipment, transportation and packaging, etc., can solve the problems of limited friction performance, uneven distribution, and inability to fully exert the excellent characteristics of iron phase, etc., to achieve Excellent friction and wear properties, the effect of improving the interface bonding strength

Active Publication Date: 2017-10-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, iron is added to the copper-based friction material in the form of iron powder. The iron particles in the sintered material are relatively coarse and unevenly distributed, and are mainly distributed in the copper matrix. Pores will be generated at the junction with the copper matrix due to atomic diffusion. The improvement of the friction performance of the material is limited, and the excellent characteristics of the iron phase cannot be fully utilized

Method used

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  • Preparation method of copper-based friction material with uniformly-distributed ferrum phase

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Prepare raw materials: copper-iron alloy powder with a mass ratio of 70%, 7% tin powder, 3% nickel powder, 7% graphite powder (flaky), 5% silica powder, 1% molybdenum disulfide, 7% Mullite;

[0015] 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;

[0016] 3. The uniformly mixed powder is cold-pressed, and the pressure is 400MPa;

[0017] 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 180 minutes, and keep the hot-pressing pressure at 2MPa constant;

[0018] 5. Cool to below 100°C and take out, keep the pressure constant during the cooling process.

Embodiment 2

[0020] 1. Prepare raw materials: copper-iron alloy powder with a mass ratio of 73%, 7% tin powder, 3% nickel powder, 7% graphite powder (flaky), 2% silicon dioxide powder, 1% molybdenum disulfide, 7% Mullite;

[0021] 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;

[0022] 3. The uniformly mixed powder is cold-pressed, and the pressure is 400MPa;

[0023] 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 160 minutes, and keep the hot-press pressure at 2.3MPa, which is constant;

[0024] 5. Cool to below 100°C and take out, keep the pressure constant during the cooling process.

Embodiment 3

[0026] 1. Prepare raw materials: copper-iron alloy powder with a mass ratio of 77%, 5% tin powder, 2% nickel powder, 5% graphite powder (flaky), 3% silicon dioxide powder, 1% molybdenum disulfide, 7% Mullite;

[0027] 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;

[0028] 3. The uniformly mixed powder is cold-pressed, and the pressure is 400MPa;

[0029] 4. Sinter the cold green body in a hot-press sintering furnace, heat it to 920°C, sinter in a hydrogen-nitrogen mixed gas, keep it warm for 140 minutes, and keep the hot-press pressure at 2.7MPa, which is constant;

[0030] 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 preparation method of a copper-based friction material with uniformly-distributed ferrum phase, and belongs to the technical field of preparation of powder metallurgy copper-based friction materials. The preparation method comprises the following steps that, by mass percentage, 70-80% of copper-iron alloy powder is taken as a matrix raw material of the copper-based friction material, 5-10% of tin powder, 1-5% of nickel powder, 5-10% of scale-like graphite powder, 1-10% of silica powder, 1-5% of molybdenum disulfide and 5-15% of mullite are added into the copper-iron alloy powder, all the materials are uniformly mixed according to a certain ratio and are subjected to cold-pressing forming and hot-pressing sintering to obtain the copper-based friction material with the ferrum phase uniformly distributed on phase interfaces between the matrix and the additive components, wherein the sintering temperature is 850-950 DEG C, and the heat preservation time is 2-3 hours. The copper-iron alloy powder is prepared by adopting an argon atomization mode, and the mass fraction of the iron element is 2-4%. The copper-iron alloy powder replaces pure copper powder to be taken as the matrix raw material, the ferrum phase can be uniformly distributed on the phase interfaces, so that the interface strength is improved, and meanwhile the wettability between the copper and the graphite is improved; and the prepared copper-based powder metallurgy material for a brake pad is small in porosity, high in matrix strength and has more excellent friction and abrasion performance compared with materials used in a traditional brake pad.

Description

technical field [0001] The invention belongs to the technical field of preparation of powder metallurgy copper-based friction materials, and in particular provides a technology for preparing copper-based friction materials in which Fe phases are evenly distributed in a network shape by using atomized copper-iron alloy powder as a raw material. Background technique [0002] Copper-based friction materials use copper as the matrix, adding matrix strengthening components (Ni, Mo, Ti, Sn, Zn, P, etc.), friction components (Fe, 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 composite materials have excellent properties such as good wear resistance, high thermal conductivity, and strong anti-adhesion, and are the main materials for high-speed train brake pads. Iron acts as a friction component in the copper-based friction material, ...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C32/00C22C1/05C09K3/14
CPCC09K3/14C22C1/058C22C9/00C22C32/00B22F2999/00B22F2998/10B22F3/1007B22F2201/11B22F1/10B22F3/02
Inventor 曲选辉张鹏章林刘婷婷方智
Owner UNIV OF SCI & TECH BEIJING
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