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A copper-based composite material reinforced with double-sized hard particles and its preparation method

A technology of copper-based composite materials and hard particles, which is applied in the field of copper-based composite materials, can solve the problems of poor bonding between hard particles and copper interfaces, and achieve improved mechanics and friction and wear resistance, stable friction coefficients, and easy production. Effect

Inactive Publication Date: 2020-10-02
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The second object of the present invention is to provide a method for preparing a copper-based composite material reinforced with double-sized hard particles, which has a simple process, is easy to produce, and can solve the problem of poor bonding between hard particles and copper interfaces

Method used

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  • A copper-based composite material reinforced with double-sized hard particles and its preparation method
  • A copper-based composite material reinforced with double-sized hard particles and its preparation method
  • A copper-based composite material reinforced with double-sized hard particles and its preparation method

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preparation example Construction

[0046] The present invention also provides a method for preparing a double-sized hard particle-reinforced copper-based composite material comprising the following steps:

[0047] (1) Mixing: Weigh small-sized hard particles, high-carbon ferrochrome particles, natural flake graphite and electrolytic copper powder as mixed raw material powders into a mixing tank according to the mass fraction, and add the mixing agent dropwise. Wherein, the weight ratio of the mixed raw material powder to the mixing agent is 1:0.002-0.005. Put the mixing tank into a three-dimensional swing mixer and mix for 3-4 hours; wherein, the rotation speed of the mixer is 350-450r / min; after the mixing is completed, a composite powder is obtained.

[0048] (2) Cold press forming: put the composite powder into a steel mold, and cold press form it under a hydraulic press. Wherein, the cold pressing pressure is 450-550 MPa, and the holding time is 30-60 s; the blank is obtained after cold pressing.

[0049] (...

Embodiment 1

[0051] (1) Take 3g copper-plated Si0 2 Granules (size 20μm), 8g high-carbon ferrochromium particles (size 100-300μm), 10g natural flake graphite (size 300μm), 79g electrolytic copper powder (size 35μm) into the mixing tank, drop 0.2ml of mixing agent , put the mixing tank into the three-dimensional oscillating mixer and mix the materials for 4 hours, wherein the rotation speed of the mixer is 400r / min to obtain the composite powder;

[0052] (2) Fill the composite powder with an inner diameter of In the steel mold, it is cold-formed under the hydraulic press. The cold pressing pressure is 500MPa, and the holding time is 1min. The blank is obtained after cold pressing.

[0053] (3) Put the cold-pressed billet into the inner diameter sintered in a vacuum hot-press furnace. The vacuum in the furnace is 10 -2 Pa, the heating rate in the furnace is 20°C / min, and the temperature is raised to 400°C for 2 hours, so that the mixing agent is completely volatilized from the bille...

Embodiment 2

[0055] (1) Take 1g copper-plated Si0 2 Granules (size 30μm), 6g high-carbon ferrochrome particles (size 100-300μm), 8g natural flake graphite (size 200μm), 85g electrolytic copper powder (size 35μm) are put into the mixing tank, and 0.2ml mixing agent is added dropwise , put the mixing tank into a three-dimensional oscillating mixer and mix for 3 hours, wherein the rotation speed of the mixer is 450r / min to obtain a composite powder.

[0056] (2) Fill the composite powder with an inner diameter of In the steel mold, it is cold-formed under the hydraulic press. Among them, the cold pressing pressure is 450 MPa, and the holding time is 1 min; the blank is obtained after cold pressing.

[0057] (3) Put the cold-pressed billet into the inner diameter sintered in a vacuum hot-press furnace. The vacuum in the furnace is 10 -2 Under Pa, the heating rate in the furnace is 25°C / min, and the temperature is raised to 450°C for 2 hours, so that the mixing agent is completely volati...

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Abstract

The invention discloses a copper-based composite material reinforced by double-size hard particles. The copper-based composite material is prepared from, by mass, 1%-5% of ceramic particles, 6%-12% ofhigh-carbon ferrochromium particles, 8%-12% of natural flake graphite and the balance of electrolytic copper powder, wherein the ceramic particles are one or more of copper-plated SiC particles, copper-plated B4C particles, copper-plated TiC particles, copper-plated A1203 particles, copper-plated Cr203 particles, copper-plated SiO2 particles, copper-plated Si3N4 particles and copper-plated AlN particles. The invention also provides a preparation method of the copper-based composite material reinforced by the double-size hard particles.

Description

technical field [0001] The invention belongs to the technical field of copper-based composite materials, in particular to a copper-based composite material reinforced by double-sized hard particles and a preparation method thereof. Background technique [0002] Copper-based composite materials have good processability and thermal conductivity, so they are used as braking materials for aircraft, automobiles, high-speed trains and other vehicles. Graphite is often added as a solid lubricant in copper-based composites to stabilize the friction coefficient and reduce the wear rate during sliding by forming a graphite-rich transfer layer on the friction surface. However, the addition of soft graphite will inevitably lead to a decline in the mechanical properties of copper-based composites, while greatly reducing the coefficient of friction of the material. [0003] Braking materials not only require good lubricating properties, but also require excellent mechanical properties an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/05
CPCC22C1/05C22C9/00C22C32/0084
Inventor 邹豪豪冉旭朱巍巍战思琪
Owner CHANGCHUN UNIV OF TECH
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