Method for improving strength and conductivity of Cu-Cr-Nb alloy

A cu-cr-nb, alloy strength technology, applied in the direction of metal/alloy conductors, conductors, circuits, etc., to achieve the effect of enhancing the bonding force, improving the overall performance of the alloy, and increasing the surface activity

Active Publication Date: 2021-02-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above research shows that the problem of how to simultaneously improve the electrical conductivity and strength of Cu-Cr-Nb alloys has not been effectively solved.

Method used

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  • Method for improving strength and conductivity of Cu-Cr-Nb alloy
  • Method for improving strength and conductivity of Cu-Cr-Nb alloy
  • Method for improving strength and conductivity of Cu-Cr-Nb alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of copper alloy powder suitable for SLM

[0040] Put electrolytic pure copper and Cr-Nb intermediate alloy raw materials into a vacuum induction melting furnace for melting; when the raw materials are melted and completely alloyed, vacuum degassing is carried out at 1580°C for 10 minutes, and then the fully alloyed melt is melted at 3.5kg / The flow rate of min is introduced into the close-coupled gas atomization furnace through the guide tube, the atomization temperature is controlled at 1600°C, the atomization medium pressure is 3.5MPa, and high-purity argon (purity 99.99wt%) is used as the atomization medium to spray The liquid flow is broken into fine droplets, and after cooling and rapid solidification, Cu-Cr-Nb alloy powder is formed; finally, the required Cu-Cr- Nb alloy powder, vacuum, 100°C, drying for 1 hour, packaged in a reducing atmosphere with a hydrogen content of 3v% and an argon content of 97v%, the content of Cr in the alloy powder is 1....

Embodiment 2

[0049] Embodiment two: lower copper content example

[0050] (1) Preparation of copper alloy powder suitable for SLM

[0051] Put the electrolytic pure copper and Cr-Nb intermediate alloy into the vacuum induction melting furnace for melting; when the raw materials are melted and completely alloyed, carry out vacuum degassing at 1580°C for 10 minutes, and then melt the fully alloyed melt at 3.5kg / min The flow rate is introduced into the close-coupled gas atomization furnace through the guide tube, the atomization temperature is controlled at 1600°C, the atomization medium pressure is 3.5MPa, and high-purity argon (purity 99.99wt%) is used as the atomization medium to spray the molten metal The flow breaks into fine droplets, and after cooling and rapid solidification, Cu-Cr-Nb alloy powder is formed; finally, the required Cu-Cr-Nb is screened out by using a nitrogen screening device and ultrasonic vibration screening at low temperature. The alloy powder is dried in vacuum at ...

Embodiment 3

[0060] Embodiment three: higher copper content example

[0061] (1) Preparation of copper alloy powder suitable for SLM

[0062]Put the electrolytic pure copper and Cr-Nb intermediate alloy into the vacuum induction melting furnace for alloy melting; when the alloy is completely melted, carry out vacuum degassing at 1580°C for 10 minutes, and then pass the completely melted alloy through the induction furnace at a flow rate of 3.5kg / min The flow tube is introduced into a close-coupled gas atomization furnace, the atomization temperature is controlled at 1600°C, the atomization medium pressure is 3.5MPa, and high-purity argon (purity 99.99wt%) is used as the atomization medium to crush the metal liquid flow into fine droplets, after cooling and rapid solidification, Cu-Cr-Nb alloy powder is formed; finally, the required Cu-Cr-Nb alloy powder is screened out by using nitrogen sieving device and ultrasonic vibration sieving at low temperature. In vacuum, at 100°C, dry for 1 hour...

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Abstract

The invention provides a method for improving strength and conductivity of a Cu-Cr-Nb alloy. According to the method, Cu-Cr-Nb alloy powder with high sphericity degree and less satellite powder is prepared through argon atomization, nitrogen low-temperature winnowing powder screening is adopted, and packaging is conducted in the reducing atmosphere; SLM forming is conducted in the atmosphere withthe hydrogen content being 1-3% and the balance of argon gas, so that oxygen content in the alloy is effectively reduced, and conductivity of the alloy is improved; and finally, a formed part is placed in a reducing atmosphere to be subjected to two-stage aging treatment, and the Cu-Cr-Nb alloy with high strength, high plasticity and high conductivity is obtained. The room-temperature tensile strength of the Cu-Cr-Nb alloy prepared through the method is not lower than 623 MPa, the elongation is not lower than 27%, the microhardness is not lower than 217 HV, the electric conductivity reaches 84% IACS, and the 700 DEG C high-temperature tensile strength is not lower than 140 MPa. The method has important application value in the field of high-strength and high-conductivity copper alloys.

Description

technical field [0001] The invention provides a method for improving the strength and electrical conductivity of a Cu-Cr-Nb alloy, which belongs to the fields of additive manufacturing and copper alloys. Background technique [0002] The strength and electrical conductivity of copper alloys restrict each other, how to simultaneously improve their strength and electrical conductivity has always been a problem that plagues people. Cu-Cr-Nb alloy has good strength, creep performance, high thermal conductivity, low cycle fatigue performance and high temperature stability, and is an important structural functional material in the field of aerospace and nuclear energy. In recent years, extensive research has been carried out to further improve its comprehensive performance. Guo et al. (XiaoliGuo, et al. Microstructure and properties of Cu-Cr-Nballoy with high strength, high electrical conductivity and good softening resistance performance at elevated temperature. Materials Scienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08C22C9/00B22F10/28B33Y70/00B33Y10/00B22F10/64C22F1/08B33Y40/20H01B1/02
CPCB22F9/082C22C9/00B33Y70/00B33Y10/00B22F3/24C22F1/08B33Y40/20H01B1/026B22F2009/0836B22F2009/0848B22F2009/0896B22F2003/248B22F2999/00
Inventor 刘祖铭任亚科吕学谦魏冰周旭农必重卢思哲
Owner CENT SOUTH UNIV
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