A kind of in-situ reaction preparation method of copper-carbon composite material

A composite material and in-situ reaction technology, applied in the field of powder metallurgy, can solve the problems of low density, large wetting angle, low bonding strength, etc., and achieve the effects of improving compressive strength, improving bonding strength, and excellent comprehensive performance.

Active Publication Date: 2020-04-28
CENT SOUTH UNIV
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Problems solved by technology

Due to the huge difference in density between graphite and copper, it is difficult to prepare uniformly dispersed composite powders by mechanical alloying. At the same time, carbon tends to adhere to the surface of metal particles during mechanical alloying, which makes the gap between metal and metal phase in the subsequent sintering process Without direct contact, it is difficult to improve the comprehensive performance of the material
In the conventional powder metallurgy method, copper powder and graphite powder are directly mixed and sintered to form a billet, but the product density is not high, and the bonding strength between copper and carbon is not high
The liquid phase impregnation method can prepare large-scale copper-carbon composite materials, but because the thermal expansion coefficients of copper and carbon are too different, and the wetting angle between the two is very large, the combination of the two is prone to be weak and holes will be generated during the cooling process after infiltration. defect
[0004] CN 104894424B discloses a preparation method of a self-lubricating copper-carbon pantograph composite material, which uses Gasar porous copper as a precursor, presses a mixture of binder and graphite into it, and prepares copper by die-casting and sintering processes Carbon composite materials, but the carbon content and material properties are limited by the porosity and strength of the porous copper precursor; CN 102694329A discloses a process for mixing and pressing carbon materials, adhesives and copper-coated carbon materials and then sintering, the adhesive Although the addition of the material can help the material to form, it will greatly affect the electrical conductivity and friction properties of the material, making the material high resistivity, brittle, and poor lubricity

Method used

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  • A kind of in-situ reaction preparation method of copper-carbon composite material
  • A kind of in-situ reaction preparation method of copper-carbon composite material
  • A kind of in-situ reaction preparation method of copper-carbon composite material

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Embodiment 1

[0041] Select the copper powder with a particle size range of 50-100 μm and the graphite powder with a particle size range of 30-80 μm as raw materials, prepare copper-carbon composite materials according to the following steps, (1) Copper powder oxidation: 80g copper powder is placed in a tube furnace, Introduce argon for protection, then raise the temperature to 300°C, stop argon, and inhale compressed air at an air flow rate of 1L / min, keep warm for 15 minutes, then stop inflowing air, inhale argon again for protection, and heat up to 850°C, heat preservation for 30 minutes, cooling down to obtain partially oxidized core-shell structure Cu-Cu 2 O powder (see attached figure 1 ), weight gain 2.0g; (2) mixed powder: the Cu-Cu obtained in step (1) 2 O powder is mixed with the graphite powder of 21.5g, adds the alcohol of 1.0% of total mass, carries out powder mixing in V-shape mixer or ball mill, and the time is 30 minutes; (3) vacuum hot pressing: the mixed powder of step (2...

Embodiment 2

[0048] Select copper powder with a particle size range of 50-100 μm and graphite powder with a particle size range of 30-80 μm as raw materials, and prepare copper-carbon composite materials according to the following steps. (1) Copper powder oxidation: put 80g of copper powder in a tube furnace , pass in argon for protection, then raise the temperature to 300°C, stop the argon flow, pass in compressed air, the air flow rate is 1L / min, keep warm for 15 minutes, then stop the flow of air, pass in argon again for protection, and heat up To 850 ℃, heat preservation for 30 minutes, cooling down to obtain partially oxidized core-shell structure Cu-Cu 2 O powder, weight gain 2.0g; (2) mixed powder: the Cu-Cu of step (1) gained 2 O powder is mixed with 62g graphite powder, add the alcohol of total mass 1.0%, carry out powder mixing in V-shape mixer or ball mill, the time is 30 minutes; (3) Vacuum hot pressing: the mixed powder of step (2) gained is cold-pressed After molding, put th...

Embodiment 3

[0055] Select copper powder with a particle size range of 50-100 μm and graphite powder with a particle size range of 30-80 μm as raw materials, and prepare copper-carbon composite materials according to the following steps. (1) Copper powder oxidation: put 120g of copper powder in a tube furnace , pass in argon for protection, then raise the temperature to 300°C, stop the argon flow, pass in compressed air, the air flow rate is 1L / min, keep warm for 15 minutes, then stop the flow of air, pass in argon again for protection, and heat up To 850 ℃, heat preservation for 30 minutes, cooling down to obtain partially oxidized core-shell structure Cu-Cu 2 O powder, weight gain 3.0g; (2) mixed powder: the Cu-Cu of step (1) gained 2 O powder mixes with 47.8g graphite powder, adds the alcohol of gross mass 1.0%, carries out powder mixing in V-shape mixer or ball mill, and the time is 30 minutes; (3) vacuum hot pressing: the mixed powder of step (2) gained is cooled After pressing and f...

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Abstract

A copper-carbon composite material in-situ reaction preparation method. In the method, copper powder with a core-shell structure is mixed with carbon powder to obtain a mixed powder, and the carbon-copper composite material is prepared by hot pressing and sintering at high temperature. The present invention adopts Cu-Cu with core-shell structure 2 O is mixed with graphite powder, Cu 2 An in-situ redox reaction occurs between O and graphite to achieve a firm bond between copper and graphite, minimize the influence of the two-phase interface on the electrical conductivity of the material, and greatly improve the mechanical properties of the composite material. Compared with the copper-carbon composite material obtained by direct mixing and sintering of copper powder and carbon powder, the density of the copper-carbon composite material prepared by this patent is increased by 2%-6%, and the compressive strength is increased by 20-60%. The process of the method is relatively simple, and the prepared carbon-copper composite material matrix and carbon two-phase distribution are uniform and well combined, and have excellent electrical, mechanical properties and friction and wear properties.

Description

technical field [0001] The invention discloses an in-situ reaction preparation method of a carbon-copper composite material. It belongs to the technical field of powder metallurgy. Background technique [0002] Copper-carbon composite material has the advantages of good electrical and thermal conductivity, small friction coefficient, and low wear rate. It is a new type of functional material and has been applied in the fields of electrical contact materials, friction materials, oil bearings, and mechanical parts materials. [0003] The main preparation methods of copper-carbon composite materials include the following three: mechanical alloying method, powder metallurgy method, and liquid phase impregnation method. Due to the huge difference in density between graphite and copper, it is difficult to prepare uniformly dispersed composite powders by mechanical alloying. At the same time, carbon tends to adhere to the surface of metal particles during mechanical alloying, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/14B22F1/02C22C1/05C22C9/00
CPCB22F1/0003C22C1/058C22C9/00B22F3/001B22F3/14B22F2998/10B22F1/16B22F3/02
Inventor 肖柱李周方梅龚深邱文婷黄胤杰
Owner CENT SOUTH UNIV
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