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Heat treatment method for improving strength and conductivity of copper alloy of Cu-Cr series

A heat treatment method and conductivity technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of decreased alloy strength, decreased alloy conductivity, and low alloy conductivity, and achieve high strength and fine precipitates Effect

Inactive Publication Date: 2009-10-28
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In the aging treatment process, when the aging temperature is low, the precipitated dispersed particles are fine, the strengthening effect is good, and the alloy strength is high. However, due to the low temperature, the atomic diffusion rate is slow, and even after a long time of diffusion, there are still high concentrations in the alloy. alloy elements, the conductivity of the alloy is low; when the aging temperature is high, the atomic diffusion rate is fast, after aging treatment, the concentration of alloy elements remaining in the alloy is low, and the conductivity of the alloy is high, but due to the high temperature, the precipitation The particles are easy to grow, and the strength of the alloy decreases; when the aging temperature is too high, the solubility of the precipitated phase elements in the alloy will increase, and the conductivity of the alloy will also decrease

Method used

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  • Heat treatment method for improving strength and conductivity of copper alloy of Cu-Cr series
  • Heat treatment method for improving strength and conductivity of copper alloy of Cu-Cr series
  • Heat treatment method for improving strength and conductivity of copper alloy of Cu-Cr series

Examples

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Effect test

Embodiment 1

[0025] The mass percentage is Cu-0.22wt.%Cr-0.24wt.%Zr alloy, the diameter is 15mm alloy rod, the temperature is raised to 980 ℃ for 2h with the furnace, and then rapidly water quenched. The test on the primary aging process (aging temperature and holding time) shows that the strength of the alloy is the highest at 450°C for 20 hours, and the conductivity at 20 hours at 450°C is comparable to the highest conductivity at other holding times at 450°C. The first-stage aging process of secondary aging is 450°C for 15 hours, and then the alloy is taken out and cooled to room temperature in the air; the second-stage aging process is 480°C for 5 hours, and the alloy is put into heat treatment after the aging temperature reaches the set value. Furnace, the furnace temperature drops, after closing the furnace door, the temperature returns to the set value, and then the holding time is calculated, and after the aging is completed, take it out and air cool it. The micron-scale strengthen...

Embodiment 2

[0029] The mass percentage is Cu-0.37wt.%Cr-0.18wt.%Zr alloy, the diameter is 20mm sand casting alloy rod, the temperature is raised to 980 ℃ for 2.5h with the furnace, and then rapidly water quenched. The process test of primary aging shows that the strength of the alloy is the highest at 440°C for 20 hours, and the conductivity of the alloy is not lower than that of the other aging time at 440°C. The first-stage aging process of secondary aging is 430°C for 20 hours, and then the alloy is taken out and cooled to room temperature in the air; the second-stage aging process is 480°C for 6 hours, and the alloy is put into heat treatment after the aging temperature reaches the set value. Furnace, the furnace temperature drops, after closing the furnace door, the temperature returns to the set value, and then the holding time is calculated, and after the aging is completed, take it out and air cool it. The micron-scale strengthening phases in the alloy are Cr and Cu-Zr phases, and...

Embodiment 3

[0033] The mass percentage is Cu-0.8wt%Cr alloy, the diameter is 30mm sand casting alloy rod, the temperature is raised to 980 ℃ for 3 hours for solid solution treatment, and then rapid water quenching. The process test of primary aging shows that the strength of the alloy is the highest at 460°C for 17 hours, and the electrical conductivity is equivalent to the highest conductivity of the alloy at other aging times at 460°C. The first-stage aging process of secondary aging is 450°C for 15 hours, and then the alloy is taken out and cooled to room temperature in the air; the second-stage aging process is 500°C for 4 hours, and the alloy is put into heat treatment after the aging temperature reaches the set value. Furnace, the furnace temperature drops, after the furnace door is closed and the temperature returns to the set value, the holding time will start to be counted. In the low-magnification structure of the alloy after aging treatment, there are micron-scale spherical Cr ...

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Abstract

The invention pertains to the field of heat treatment of nonferrous metal and relates to a heat treatment technique for improving the strength and conductivity of copper alloy of Cu-Cr series. The alloy is used as lead frame materials, electrified railway contact lines and the like in the electronic industry. The invention adopts a secondary ageing heat treatment technique with two stages, which comprises the following steps: copper alloy containing supersaturation precipitated phase element Cr after solution treatment is first aged at lower temperature for a long time for leading the precipitated phase to be in a fine and dispersed distribution and the precipitation to be relatively sufficient, and laying a foundation for obtaining high strength; then the ageing temperature is properly increased to improve the diffusion velocity of atoms, thus leading the Cr elements in the residual solution in the Cu matrix to be further precipitated; as the precipitated phase exists, part of the newly precipitated Cr is precipitated on the existing Cr particles; the existing dispersed distribution of Cr is retained at the lower temperature, and the other part of Cr is also precipitated, thereby forming more dispersion-distributed nanometer particles, greatly improving the strength of the alloy, and simultaneously purifying the copper matrix and improving the conductivity.

Description

technical field [0001] The invention belongs to the field of heat treatment of nonferrous metals, and relates to a heat treatment method for improving the strength and electrical conductivity of Cu-Cr series copper alloys. Background technique [0002] Pure copper has high conductivity, but its strength cannot meet the requirements of many occasions. Copper alloys with high strength and high conductivity are an important type of copper alloy that has developed rapidly in recent years. Generally speaking, high conductivity is Thermal conductivity is also high. High-strength and high-conductivity copper alloys are widely used as lead frame materials for integrated circuits and semiconductor devices, electrified railway contact wires, contact materials, crystallizers for metallurgical continuous casting, heat exchangers for nuclear power plants, etc., as well as in high-tech and military fields. The strength and electrical conductivity are a pair of contradictions. How to grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/08C21D1/18C21D11/00
Inventor 林国标王自东张茂奎张鸿程智刚赵美
Owner UNIV OF SCI & TECH BEIJING
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