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Tungsten-copper composite material and preparation method thereof

A composite material, tungsten-copper alloy technology, applied in the field of metallurgy, can solve the problems of difficult to ensure the uniformity of tungsten distribution, reduce the thermal conductivity of the alloy, air tightness and low thermal conductivity, etc., to avoid uneven structure, composition Wide range of effects

Inactive Publication Date: 2013-04-03
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this technology is that the dimensional accuracy of the sintered parts is high. The disadvantage is that unnecessary alloy elements are introduced into the alloy, which reduces the thermal conductivity of the alloy. In addition, the tungsten-copper alloy prepared by this technology method will have micropores locally, so Air tightness and thermal conductivity are lower than infiltration method
[0006] In addition to some limitations or shortcomings mentioned above, the above two technical methods also have some common defects: (1) It is difficult to completely avoid pollution during the powder mixing and sintering process, which makes the total content of oxygen, nitrogen and other impurities in the alloy higher , which hinders its application in high vacuum environment; (2) It is difficult to ensure the uniform distribution of tungsten in the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A tungsten-copper alloy, comprising the following components and content (percentage by weight): 90% tungsten and 10% copper. The preparation method comprises the following steps:

[0031] Step 1: Select a tungsten wire with a diameter of 15 μm, pickle it with 15% hydrochloric acid, rinse it with water, and dry it; use a fiber weaving machine to weave the tungsten wire three-dimensionally, and control the weaving parameters so that the porosity of the braided body is 17-20%, at this time the apparent density of the tungsten braid is 15.5-16.0 g / cm 3 .

[0032] Step 2: Calculate the weight of copper required to completely fill the pores of the obtained tungsten braid, put a copper ingot with a calculated weight of 110% into a graphite container, and then place the tungsten wire braid on top of the copper ingot. Put the graphite container in the vacuum furnace and keep the vacuum degree in the furnace at 1×10 -3 Above Pa, the heating rate is 3-10°C / min, the infiltratio...

Embodiment 2

[0035] A tungsten-copper alloy, comprising the following components and contents (percentage by weight): 75% tungsten and 25% copper. The preparation process comprises the following steps:

[0036] Step 1: Select a tungsten wire with a diameter of 25 μm, pickle it with 15% hydrochloric acid, rinse it with water and dry it, then use a fiber weaving machine to weave the tungsten wire three-dimensionally, and control the weaving parameters so that the porosity of the braided body is 38-40%, at this time the apparent density of the tungsten braid is 11.5-12.0g / cm 3 ;

[0037] Step 2: Calculate the weight of copper required to completely fill the pores of the obtained tungsten braid, put the copper ingot with a calculated weight of 105% into the graphite container, and then place the tungsten wire braid on the copper ingot. Put the graphite container in the vacuum furnace and keep the vacuum degree in the furnace at 1×10 -3 Above Pa, the heating rate is 3-10°C / min, the infiltrat...

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Abstract

The invention relates to a tungsten-copper composite material, wherein tungsten and copper are mutually clad and through, and the tungsten-copper composite material comprises the following components in percentage by weight: 60-90 percent of tungsten and the balance of copper. A preparation method of the tungsten-copper composite material comprises the following steps of: washing a tungsten filament with acid, cleaning, and carrying out three-dimensional or two-dimensional braiding to obtain a tungsten filament braided body; placing a copper material into a graphite container, placing the obtained tungsten filament braided body on the copper material, and holding a temperature of 1200-1350 DEG C for 0.5-2h under a vacuum environment with the vacuum degree being larger than 1*10<-3>Pa; cooling to the room temperature in a furnace, and then removing redundant copper from the surface of the obtained green body to obtain the tungsten-copper composite material. The tungsten-copper composite material prepared with the preparation method has the advantages of avoiding the problem of nonuniform texture caused by nonuniform mixing of tungsten and copper alloy prepared by applying a traditional process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a preparation process of a composite material, in particular to a copper-tungsten composite material and a preparation method thereof. Background technique [0002] Tungsten-copper composite material has both high hardness and low expansion coefficient of tungsten, and high electrical and thermal conductivity of copper. Its thermal conductivity, electrical conductivity and thermal expansion coefficient can be designed by adjusting the content of tungsten and copper components, so it is widely used in microwave devices. , integrated circuit packaging materials, electrical contact materials and other fields. [0003] There are usually two methods for preparing tungsten-copper composite materials: infiltration method and liquid phase activation sintering method. [0004] Infiltration method: Press tungsten powder or a mixed powder mixed with part of copper powder into a compact, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C49/10C22C49/14C22C47/08C22C111/02
Inventor 林文松
Owner SHANGHAI UNIV OF ENG SCI
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