Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of high-strength and high-conductivity copper-graphite composite material and preparation method thereof

A composite material and graphite technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of complicated process, expensive price, and limited improvement of alloy mechanical properties, and achieve the effect of simple process, improved performance and high strength

Active Publication Date: 2021-08-17
浙江杭机新型合金材料有限公司
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Under the premise of ensuring the electrical conductivity of the material, the mechanical properties of the copper alloy prepared by the traditional alloying method are limited, but the strength of the alloy material is improved by adding too much, but the electrical conductivity drops rapidly, so it is difficult to prepare a high-quality copper alloy at the same time. Strong and highly conductive copper alloy
Copper alloys prepared by the second-phase composite material method, generally, the smaller the second-phase particles, the better the strengthening effect on the metal or alloy, but the traditional method of adding nano-sized particles to the molten metal is complex and requires production process control. Very high, difficult to achieve uniform distribution of nanoparticles
However, the preparation of three-dimensional nanostructured copper and copper alloy bulk materials is very difficult.
On the one hand, the preparation of nanopowders is difficult, expensive, and easily oxidized, which is not conducive to transportation and storage
On the other hand, the grains of nanopowders will grow rapidly during the sintering process, and the grain size is extremely difficult to control
Mechanical alloying (high-energy ball milling) is one of the effective methods for preparing nano-powders, but the introduction of impurities such as iron in the ball milling process has a great impact on the material. In view of the existing shortcomings, it is necessary to develop a high-strength, high-conductivity copper -Graphite composite material and its preparation method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The invention provides a method for preparing a high-strength and high-conductivity copper-graphite composite material, comprising: step S1: weighing copper powder and graphite powder in proportion and putting them into a ball milling pot with copper as the lining of the ball milling pot and a ball milling medium, Perform high-energy ball milling to obtain nanometer powder. Wherein, the content of graphite powder is greater than 0 and less than or equal to 1wt.%, the rest is copper powder, and the content of graphite powder is preferably 0.03wt.%˜1wt.%. In the present invention, the amount of graphite added is less, and the electrical conductivity of the material decreases less. Graphite powder is added to copper powder to enhance its mechanical properties, but if the amount of graphite powder added is too much, its conductivity will decrease; if the amount of graphite powder added is too small, the strength of the material will be low, which cannot meet the requirement...

Embodiment 1

[0037] Weigh the copper powder and graphite powder and mix them into the ball mill tank. Among them, the content of graphite is 0.03wt.%, the rest is copper, the total weight is 300kg, the ratio of ball to material is 4:1, the process control agent is 500ml, the ball mill 160h. Put the ball-milled nano-powder into the high-temperature furnace, and the sintering temperature is 440°C. After preheating for 3 minutes, start to pressurize. The pressurized pressure is 200MPa, and the sintering is kept for 1 minute. Then take out the aging treatment, the treatment temperature is 205°C, and the time is 5 hours. The sample has been polished, with a relative density of 98.2%, a hardness of 85.4HRB, and an electrical conductivity of 89.2% IACS.

Embodiment 2

[0039] Weigh the copper powder and graphite powder and mix them into the ball mill tank. Among them, the graphite content is 0.05wt.%, and the rest is copper. 150h. Put the ball-milled nano-powder into the high-temperature furnace, and the sintering temperature is 440°C. After preheating for 3 minutes, start to pressurize. The pressurized pressure is 200MPa, and the sintering is kept for 1 minute. Then take out the aging treatment, the treatment temperature is 205°C, and the time is 5 hours. The sample has been polished, with a relative density of 98.2%, a hardness of 87.2HRB, and an electrical conductivity of 87.4% IACS.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of metal materials, in particular to a high-strength and high-conductivity copper-graphite composite material and a preparation method thereof. The object of the present invention is to provide a high-strength and high-conductivity copper-graphite composite material and a preparation method thereof, wherein the preparation method of the high-strength and high-conductivity copper-graphite composite material comprises: step S1: copper powder and graphite powder are ball milled with red copper Milling the tank lining and the ball milling medium into a nanopowder, wherein the content of graphite powder is greater than 0 and less than or equal to 1wt.%, and the rest is copper powder; step S2: pressing the nanopowder to obtain a green body ; Step S3: Sintering the green body at 400-480° C. to obtain a copper-graphite composite material. In the present invention, ball milling is carried out in a ball milling pot with copper as the lining of the ball milling pot and a ball milling medium, thereby obtaining a copper-graphite composite material with no iron impurities, no magnetism, high strength and high electrical conductivity, and the copper-graphite composite The preparation process is simple, without a smelting process, and achieves the effect of energy saving and environmental protection.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a high-strength and high-conductivity copper-graphite composite material and a preparation method thereof. Background technique [0002] Copper and copper alloys have excellent electrical conductivity, thermal conductivity, and corrosion resistance, and are widely used in marine ships, electronic appliances, aerospace, machinery manufacturing, metallurgy, and national defense and military industries. However, for general copper alloys, it is a pair of contradictory properties that the mechanical properties (strength, hardness, etc.) and electrical conductivity of the material cannot be combined. However, the market is in urgent need of copper with good electrical conductivity and excellent mechanical properties. At present, the development of high-hardness copper alloys is mainly focused on automotive synchronizer rings and friction materials for hydraulic pumps such as ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/05C22C1/10B22F9/04B22F1/00B22F3/02B22F3/10
CPCC22C9/00C22C1/051B22F9/04B22F3/02B22F3/10B22F2009/043B22F1/054
Inventor 于立鹏马贤锋刘建伟
Owner 浙江杭机新型合金材料有限公司