Method for preparing rare earth oxide dispersion strengthened copper

A technology for dispersion strengthening of copper and rare earth oxides, applied in the field of metal matrix composite materials and preparation, can solve the problems of difficult to achieve strengthening effect, small solid solubility, and insufficient strengthening effect, and achieve excellent high temperature softening performance, The effect of improving performance and life, excellent electrical conductivity

Inactive Publication Date: 2013-03-27
NANCHANG UNIV
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Problems solved by technology

[0004] However, it is precisely because of the extremely small solid solubility of rare earths in copper that the difficulties in the preparation process
Because the Y generated in the range of solid solubility 2 o 3 If the content of rare earth oxides is too small, the strengthening effect cannot be achieved; once the solid solubility is exceeded, rare earth elements such as yttrium will segregate at the grain boundaries in the form of intermetallic compounds, and the Y obtained by oxidation of these intermetallic compounds 2 o 3 The dispersion of rare earth oxides is poor, and the particles are too coarse, so the strengthening effect is difficult to achieve

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] A Cu-0.4Y (%, mass fraction, the same below) alloy sample with a thickness of 1 mm and a size of 20 mm × 70 mm was subjected to liquid phase in-situ reaction, and the process steps were as follows.

[0018] (1) Surface treatment: Polish the surface of the sample with 360# sandpaper, remove the surface oxide layer, and clean it with alcohol.

[0019] (2) Liquid phase in-situ reaction: In the atmosphere protection furnace, heat the alloy sample to the liquidus temperature of 1080°C for 2 hours, the protection gas is industrial nitrogen, and the partial pressure of oxygen in nitrogen is 10 -3 ~10 -6 Pa.

[0020] (3) Reduction: in an atmosphere protection furnace, hydrogen reduction, 600℃×1h.

[0021] (4) Flatten the sample.

[0022] Yttrium oxide dispersion strengthened copper matrix composite material was prepared through the above process, Y 2 o 3 The particles are evenly distributed on the copper substrate, the average particle size is 7nm, and the average particle...

Embodiment 2

[0024] A Cu-0.6Y alloy sample with a thickness of 1 mm and a size of 20 mm × 70 mm was subjected to liquid phase in-situ reaction, and the process steps were as follows.

[0025] (1) Surface treatment: Polish the surface of the sample with 360# sandpaper, remove the surface oxide layer, and clean it with alcohol.

[0026] (2) Liquid-phase in-situ reaction: In an atmosphere protection furnace, heat the alloy sample to the liquidus temperature of 1078°C for 3 hours, the protection gas is industrial nitrogen, and the partial pressure of oxygen in nitrogen is 10 -3 ~10 -6 Pa.

[0027] (3) Reduction: in an atmosphere protection furnace, hydrogen reduction, 600℃×1h.

[0028] (4) Flatten the sample.

[0029] The properties of yttrium oxide dispersion strengthened copper prepared through the above process are: tensile strength 618MPa, electrical conductivity 92.7%IACS, softening temperature 895°C.

Embodiment 3

[0031] A Cu-0.8Y alloy sample with a thickness of 1 mm and a size of 20 mm × 70 mm was subjected to liquid phase in-situ reaction, and the process steps were as follows.

[0032] (1) Surface treatment: Polish the surface of the sample with 360# sandpaper, remove the surface oxide layer, and clean it with alcohol.

[0033] (2) Liquid-phase in-situ reaction: In an atmosphere-protected furnace, heat the alloy sample to the liquidus temperature of 1075°C for 4 hours, the protective gas is industrial nitrogen, and the partial pressure of oxygen in nitrogen is 10 -3 ~10 -6 Pa.

[0034] (3) Reduction: in an atmosphere protection furnace, hydrogen reduction, 600℃×1h.

[0035] (4) Flatten the sample.

[0036] The properties of yttrium oxide dispersion strengthened copper prepared by the above process are: tensile strength 667MPa, electrical conductivity 90.2%IACS, softening temperature 910°C.

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Abstract

A method for preparing rare earth oxide dispersion strengthened copper comprises the following steps of: melting the alloy materials in such a ratio that the mass fraction of metal yttrium is 0.4-1% and the rest is copper and then forming an alloy bar through casting; rolling the alloy bar into an alloy sheet which is 1 mm thick; putting the alloy sheet into a tubular atmosphere furnace, wherein the atmosphere in the furnace is industrial nitrogen, the oxygen partial pressure of the industrial nitrogen is 10<-3> to 10<-6> Pa, the reaction temperature is the liquidus temperature of the alloy and the time of heat preservation is 2-5 h; after the temperature in the furnace is reduced to 500-600 DEG C, replacing the atmosphere in the furnace with reducing gas H2 and preserving heat for 1-2 h, thereby obtaining the dispersion strengthened copper-based composite material. The Y2O3 particle dispersion strengthened copper-based composite material prepared by the method provided by the invention has the tensile strength greater than 580 MPa, the electric conductivity over 90% IACS and the softening temperature higher than 900 DEG C. Besides, the copper-based composite material is high in mechanical properties, and excellent in electric conductivity and high-temperature softening resistance.

Description

technical field [0001] The invention belongs to the field of metal matrix composite material and its preparation. Background technique [0002] High-strength and high-conductivity copper alloys (composites) mainly include precipitation-strengthened copper alloys and dispersion-strengthened copper-based composites. Precipitation-strengthened copper alloys represented by Cu-Cr alloys have high strength due to dislocation cutting of strengthening particles (Cr particles) that have a coherent relationship with the copper matrix, but their resistance to high temperature softening is poor. Cu-Al 2 o 3 Dispersion strengthened copper matrix composites represented by alloys are due to Al 2 o 3 The particles have high thermodynamic stability and have excellent resistance to high temperature softening ability, but Al 2 o 3 The Orowan strengthening mechanism of particles (dislocation bypassing strengthening particles) is not as effective as the strengthening effect of dislocation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/02C22F1/08
Inventor 唐建成卓海鸥叶楠覃德清李婷
Owner NANCHANG UNIV
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