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Cu-NbC nanometer dispersion strengthened copper alloy and preparation method thereof

A technology for dispersion strengthening of copper and copper alloys, applied in the field of powder metallurgy materials, can solve the problems of loss of high-strength and high-conductivity properties, decrease in strength and electrical conductivity, and electrical conductivity down to 40%, etc., so as to suppress recovery recrystallization and ensure electrical conductivity. , the effect of high resistance to high temperature softening characteristics

Inactive Publication Date: 2017-02-15
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the high-strength and high-conductivity copper alloys developed and used at home and abroad are mainly divided into three categories: one is precipitation-strengthened copper alloys represented by Cu-Ni-Si, Cu-Cr-Zr, etc. b The highest can reach about 800MPa, but at this time the conductivity has dropped below 40% IACS
In addition, such alloys will lose their high-strength and high-conductivity properties when the temperature is higher than 600 °C, and their strength and electrical conductivity will drop sharply.
The second category is based on Al 2 o 3 、TiB 2 Dispersion strengthened copper alloys with ceramic particles as strengthening phase, such as Cu-Al 2 o 3 The electrical conductivity of the alloy can be maintained at 80% to 92% IACS, and the strength can reach 500 to 620MPa, but Al 2 o 3 Due to the limitation of the internal oxidation reaction conditions of the strengthening phase, the addition amount is small, which affects the further improvement of the strength
How to maintain the high electrical conductivity of copper alloy (> 50% IACS), while achieving the tensile strength of more than 1000MPa, and have good heat resistance (high temperature softening temperature> 900 ℃) is currently both in theory and technology at home and abroad. unresolved issues

Method used

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  • Cu-NbC nanometer dispersion strengthened copper alloy and preparation method thereof
  • Cu-NbC nanometer dispersion strengthened copper alloy and preparation method thereof
  • Cu-NbC nanometer dispersion strengthened copper alloy and preparation method thereof

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Embodiment 1

[0025] Such as figure 1 , 2 Shown in (a), 2 (b), the present invention discloses a kind of Cu-NbC nano-dispersion strengthened copper alloy and preparation method thereof, prepare Cu-10vol%NbC alloy, standard composition is Cu (90.51wt%), Nb ( 8.41wt%), C (1.08wt%), complete according to the following steps:

[0026] 1. Take 905.1g of pure Cu powder with a purity of ≥99.9% and an average particle size of 44-149μm and 10.8g of pure C powder with a purity of ≥99.995% and an average particle size of <74μm in a glove box in a pure argon atmosphere. The mixed powder was put into a stainless steel ball mill jar, and 13.74kg of stainless steel balls (ball-to-material ratio 15:1) were added, and the ball mill jar was sealed and taken out, and after ball milling at a speed of 400rpm for 5h on a ball mill, the nanocrystalline Cu-C composite powder was obtained. The material is taken and stored in the glove box;

[0027] 2. Put 84.1g of Nb powder with a purity ≥ 99% and an average par...

Embodiment 2

[0035] The invention discloses a Cu-NbC nanometer dispersion strengthened copper alloy and a preparation method thereof. The Cu-5vol% NbC alloy is prepared, and the standard components are Cu (95.26wt%), Nb (4.2wt%), C (0.54wt%) , complete the following steps:

[0036] 1. Take 952.6g of pure Cu powder and 5.4g of pure C powder and mix them evenly before ball milling. The ball-to-material ratio is 13:1, the rotation speed is 350rpm, and the ball milling time is 4h to obtain Cu-C composite powder; 42g of Nb powder is ball-milled, and the ball Ratio 8:1, rotating speed 250rpm, ball milling time 5h, to obtain ultrafine Nb powder; the obtained Cu-C composite powder and Nb powder were ball milled, ball-to-material ratio 18:1, rotating speed 350rpm, ball milling time 45h, prepared Cu- NbC nanocrystalline alloy powder;

[0037] 2. The Cu-NbC nanocrystalline alloy powder is subjected to reduction annealing treatment at 600°C for 1h; add amorphous boron powder accounting for 150ppm of ...

Embodiment 3

[0042] The invention discloses a Cu-NbC nanometer dispersion strengthened copper alloy and a preparation method thereof. The Cu-3vol% NbC alloy is prepared, and the standard components are Cu (97.16wt%), Nb (2.51wt%), C (0.33wt%) , complete the following steps:

[0043] 1. Take 971.6g of pure Cu powder and 3.3g of pure C powder and mix them evenly before ball milling. The ball-to-material ratio is 10:1, the rotation speed is 300rpm, and the ball milling time is 3h to obtain Cu-C composite powder; 25.1g of Nb powder is ball-milled, and the ball Ratio 5:1, rotating speed 200rpm, ball milling time 4h, to obtain ultrafine Nb powder; the obtained Cu-C composite powder and Nb powder were subjected to in-situ reaction ball milling, ball-to-material ratio 15:1, rotating speed 300rpm, ball milling time 40h, prepared Produce Cu-NbC nanocrystalline alloy powder;

[0044] 2. The Cu-NbC nanocrystalline alloy powder is subjected to reduction annealing treatment at 550°C for 1h; add amorpho...

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Abstract

The invention relates to the technical field of powder metallurgy materials, and discloses Cu-NbC nanometer dispersion strengthened copper alloy and a preparation method of the Cu-NbC nanometer dispersion strengthened copper alloy. The Cu-NbC nanometer dispersion strengthened copper alloy is prepared from, by volume, 3-10 vol% of NbC and the balance Cu. The preparation method of the alloy comprises the working procedures of in-situ synthesis of Cu-NbC alloy powder through a mechanical alloying method, hydrogen reduction, vacuum hot pressed sintering, canned hot extrusion and the like. The preparation process is simple, production equipment is common, and industrial production is promoted. The tensile strength sigma b of the prepared Cu-NbC alloy can reach 1000 MPa or more, the relative conductivity of the prepared Cu-NbC alloy is 50%-65% IACS, the annealing and softening resistance temperature reaches up to 900 DEG C or above, and the performance requirements of high-intensity magnetic field engineering fields of thermonuclear fusion, magnetically levitated trains, electromagnetic guns, microgravity devices and the like for conductive devices can be met.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy materials, in particular to a Cu-NbC nanometer dispersion strengthened copper alloy and a preparation method thereof. Background technique [0002] Fields such as life sciences, material properties research and major projects such as thermonuclear fusion, magnetic levitation trains, and electromagnetic guns all require strong magnetic field devices that can generate a magnetic induction intensity greater than 40T; and the stable operation of strong magnetic field devices requires its conductive devices (such as conductive coils) Not only must it have low resistivity to reduce thermal effects, high heat resistance to adapt to high temperature environment, but its tensile strength must be greater than 1000MPa to withstand huge Lorentz force. Although pure copper has excellent electrical conductivity, its mechanical strength (σ b =190MPa) and heat resistance (<200°C) are too low. At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/05
CPCC22C1/055C22C9/00
Inventor 雷若姗徐时清王焕平赵士龙陈广润李海麒
Owner CHINA JILIANG UNIV
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