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A kind of tungsten dispersion strengthened copper matrix composite material and preparation method thereof

A technology for dispersion strengthening of copper and composite materials, applied in the field of copper-based composite material preparation, can solve the problems of electrical conductivity, low thermal conductivity, performance degradation, poor ductility, etc.

Active Publication Date: 2020-04-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China Invention Patent Grant No. CN 102041421 B reports the method of preparing tungsten-copper composite powder by sol-drying method, which proves that it is feasible to complete the preparation of tungsten-copper composite material through sol system, but they are all tungsten-based composite materials with high tungsten content. Because its matrix is ​​a tungsten skeleton, it has poor ductility, low electrical conductivity and thermal conductivity
Chinese patent application No. 94112582.3 discloses a mechanical ball milling alloying method to prepare dispersion-strengthened copper resistance welding electrode materials. This method is simple and effective, but long-term ball milling may cause impurities to enter the matrix and cause performance degradation.
Chinese patent application number 201610360623.9 discloses a method for preparing alumina dispersion-strengthened copper by internal oxidation, but the internal oxidation method is only suitable for oxide dispersion-strengthened materials, not for the preparation of tungsten dispersion-strengthened copper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Weigh copper nitrate and ammonium tungstate according to the mass ratio of copper to tungsten at 97:3, add citric acid with a molar ratio of 2:1 to copper nitrate, and dissolve them in deionized water. After evaporation to dryness, a tungsten-copper composite dry set is obtained Glue precursor. The precursor is crushed and calcined in a furnace at a calcining temperature of 350°C and a calcining time of 4h. Obtain copper oxide and copper tungstate co-oxide powder.

[0019] 2) The co-oxide powder is reduced in a hydrogen protective atmosphere at 900° C. for 0.5 h to obtain tungsten dispersion strengthened copper powder.

[0020] 3) The tungsten dispersion-strengthened copper powder is subjected to 100MPa cold isostatic pressing and sintered under hydrogen protection at 950°C for 5 hours to obtain a tungsten dispersion-strengthened copper-based composite material with a W mass fraction of 3%.

[0021] In this embodiment, the average size of tungsten dispersed phase particle...

Embodiment 2

[0023] 1) Weigh copper sulfate and ammonium paratungstate according to the mass ratio of copper to tungsten at 95:5, add citric acid with a molar ratio of 3:1 to copper sulfate, and dissolve them in deionized water. After evaporation to dryness, a tungsten-copper composite xerogel precursor is obtained body. The precursor is crushed and then calcined in a furnace, the calcining temperature is 400℃, and the calcining time is 3h. Obtain copper oxide and copper tungstate composite co-oxide powder.

[0024] 2) The co-oxide powder is reduced in a hydrogen atmosphere at 800° C. for 1 h to obtain tungsten dispersion strengthened copper powder.

[0025] 3) The tungsten dispersion-strengthened copper powder is reduced and sintered after 500 MPa compression molding, and reduced and sintered under hydrogen protection at 980° C. for 2 h to obtain a W content of 5% tungsten dispersion-strengthened copper matrix composite.

[0026] In this example, the average size of tungsten dispersed phase pa...

Embodiment 3

[0028] 1) Weigh copper chloride and ammonium metatungstate according to the mass ratio of copper to tungsten at 93:7, add citric acid with a molar ratio of 4:1 to copper chloride and dissolve them in deionized water, and evaporate to obtain tungsten-copper Composite xerogel precursor. The precursor is crushed and calcined in a furnace at a calcining temperature of 450°C and a calcining time of 2h. Obtain copper oxide and copper tungstate co-oxide powder.

[0029] 2) Reduce the co-oxide powder in a hydrogen atmosphere at 700° C. for 2 hours to obtain tungsten dispersion strengthened copper powder.

[0030] 3) The tungsten dispersion-strengthened copper powder is subjected to 200MPa cold isostatic pressing and then vacuum sintered at 1000° C. for 2 hours to obtain a W content of 7% tungsten dispersion-strengthened copper-based composite material.

[0031] In this embodiment, the average size of tungsten dispersed phase particles is 28nm, the tensile strength of the tungsten dispersio...

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Abstract

The invention provides a tungsten-dispersion strengthened copper-based composite material and a preparation method thereof, and belongs to the technical field of powder metallurgy. The tungsten-dispersion strengthened copper-based composite material is characterized in that 5-50nm tungsten-dispersion-phase particles which are uniformly distributed in a substrate are utilized for strengthening thesubstrate; the material comprises 3-10% by mass of the tungsten-dispersion strengthened material, and the balance copper. The preparation method is characterized in that soluble copper salt and soluble tungstate are used as the raw materials and are dissolved in deionized water together with citric acid; the soluble copper salt, soluble tungstate and citric acid are uniformly mixed in the deionized water and then are dried by distillation to obtain gel; the gel is roasted and reduced to obtain the tungsten-dispersion strengthened copper powder; and the tungsten-dispersion strengthened copper powder is subjected to modeling and sintering to obtain the tungsten-dispersion strengthened copper-based composite material. The tungsten-dispersion strengthened copper-based composite material is superior to ODS (Oxide Dispersion Strengthened) copper by heat and electricity conducting performances on the premise that the outstanding mechanical property is ensured; and the tungsten-dispersion strengthened copper-based composite material has a wide application prospect.

Description

Technical field [0001] The invention belongs to the technical field of copper-based composite material preparation, and relates to a tungsten dispersion strengthened copper-based composite material and a preparation method thereof. Background technique [0002] Copper alloy has excellent physical properties such as good electrical conductivity, good thermal conductivity, wear resistance, and good mechanical properties, so it is widely used in various fields. However, with the development of science and technology, the requirements for copper alloys are getting higher and higher, and it is difficult for traditional copper and copper alloys to balance mechanical properties and thermoelectric properties. Dispersion-strengthened copper is distributed in the copper matrix with a small amount of nano-sized particles, which can effectively hinder the movement of dislocations and grain boundary slippage, thereby effectively improving the mechanical properties of copper materials and main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/04B22F9/22
CPCB22F9/22C22C1/0425C22C9/00
Inventor 郭志猛陆天行陈存广杨芳郝俊杰李沛纪庆竹
Owner UNIV OF SCI & TECH BEIJING