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Preparation method for high-strength high-conductivity copper alloy bar

A technology of alloy rods and copper alloys, which is applied in the field of preparation of high-strength and high-conductivity copper alloy rods, can solve the problems affecting the improvement of alloy properties, small alloy thickness, and increased production costs, so as to increase cooling rate, improve alloy properties, The effect of tissue refinement

Inactive Publication Date: 2018-01-16
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Rapid solidification methods such as atomization (>10 4 K / s), spin casting method (>10 3 K / s) etc. have a high cooling rate, but there are many shortcomings at the same time, such as the small thickness of the alloy obtained by the spin casting method, and the high oxygen content of the alloy powder obtained by the atomization method.
Moreover, the alloys prepared by these two methods cannot be used directly, and further processing is required to obtain copper alloy products, which increases production costs
Moreover, the alloy prepared by powder metallurgy method is difficult to further improve its density, which affects the performance improvement of the alloy.

Method used

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  • Preparation method for high-strength high-conductivity copper alloy bar
  • Preparation method for high-strength high-conductivity copper alloy bar
  • Preparation method for high-strength high-conductivity copper alloy bar

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Put the polished Cu blocks and Nb blocks into the vacuum arc melting furnace in order from bottom to top, and vacuumize to 1×10 -3 , argon gas is used as protective gas, the current should be controlled at 250 amperes during the smelting process, and the smelting is repeated 4 times to obtain a Cu-5%Nb master alloy. The alloy with the target composition of Cu-1.2Cr-0.3Nb was prepared, and the calculated and weighed Cu-Nb master alloy, Cr grains and Cu blocks were figure 2 The filling method is placed in a crucible and evacuated to 4 × 10 -3 Pa or more, a small amount of Ar gas is charged. First, the alloy was rapidly heated to 1150°C, held for 3 minutes, then heated to 1350°C, held for 25 minutes, and then cooled to 1280°C and held for 2 minutes. The alloy liquid was slowly poured into the lower graphite mold with an outer diameter of 100 mm and an inner diameter of 5 mm with the furnace to obtain a Cu-Cr-Nb alloy rod. The obtained alloy bar is put into a heat treat...

Embodiment 2

[0039] Put the polished Cu blocks and Nb blocks into the vacuum arc melting furnace in order from bottom to top, and vacuumize to 1×10 - 3 Above Pa, argon gas is used as protective gas, the current should be controlled at 250 amperes during the smelting process, and the smelting is repeated 4 times to obtain a Cu-25%Nb master alloy. The alloy with the target composition of Cu-0.7Cr-0.1Nb was prepared, and the calculated and weighed Cu-Nb master alloy, Cr grains and Cu blocks were calculated according to figure 2 The filling method is placed in a crucible and evacuated to 4 × 10 -3 Pa or more, a small amount of Ar gas is charged. First, the alloy was rapidly heated to 1080°C, held for 4 minutes, then slowly heated to 1450°C, held for 30 minutes, and then cooled to 1200°C and held for 3 minutes. The alloy liquid is poured into a graphite mold with an outer diameter of 90 mm and an inner diameter of 15 mm with the furnace at a slow speed first and then a fast speed to obtain ...

Embodiment 3

[0041] Put the polished Cu blocks and Nb blocks into the vacuum arc melting furnace in order from bottom to top, and vacuumize to 1×10- 3 Above Pa, argon gas is used as protective gas, the current should be controlled at 250 amperes during the smelting process, and the smelting is repeated 4 times to obtain a Cu-20%Nb master alloy. The alloy with the target composition of Cu-1.5Cr-0.5Nb was prepared, and the calculated and weighed Cu-Nb master alloy, Cr grains and Cu blocks were figure 2 The filling method is placed in a crucible and evacuated to 4 × 10 -3 Pa or more, a small amount of Ar gas is charged. First, the alloy was rapidly heated to 1050°C, held for 5 minutes, then slowly heated to 1500°C, held for 18 minutes, and then cooled to 1250°C and held for 4 minutes. The alloy liquid is poured into a graphite mold with an outer diameter of 100 mm and an inner diameter of 10 mm with the furnace at a speed of first fast and then slow to obtain a Cu-Cr-Nb alloy rod. The pre...

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Abstract

The invention discloses a preparation method for a high-strength high-conductivity copper alloy bar. The preparation method comprises the following concrete steps: placing Cu-Nb intermediate alloy, Crparticles and Cu blocks in a crucible, and carrying out melting in an induction melting furnace protected by argon so as to obtain Cu-Cr-Nb alloy liquid; subjecting the Cu-Cr-Nb alloy liquid to casting and cooling in a fine-diameter graphite mold so as to obtain a Cu-Cr-Nb alloy bar; and putting the bar into a heat treatment furnace for solutionizing and aging heat treatment, and carrying out mechanical processing so as to obtain the finished Cu-Cr-Nb alloy bar. According to the invention, the Cu-Cr-Nb alloy is prepared by using a fine-diameter graphite mold casting and cooling method, so thecooling rate of the alloy is improved, the structure of the alloy is refined, and the solid solubility of elemental Cr and Nb in a Cu substrate is greatly improved; and through the aging treatment, dispersed fine second-phase particles are precipitated from the copper substrate, so the performance of the alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of copper alloy preparation, and relates to a preparation method of a high-strength and high-conductivity copper alloy rod. Background technique [0002] Cu-Cr-Nb alloy is a kind of Cr phase and high temperature resistant phase Cr 2 A dispersion-strengthened copper alloy strengthened by Nb dual phase, the alloy has high strength, electrical conductivity and good thermal stability. Laves phase Cr 2 Nb has the advantages of high melting point, low density and excellent creep resistance, but the solubility of Cr and Nb in Cu is very limited at low temperature, which affects the effect of precipitation strengthening. Rapid solidification method is often used to prepare refractory alloys and alloys with low solid solubility. The use of rapid solidification technology to prepare Cu-Cr-Nb alloy can greatly improve the solid solubility of alloying elements Cr and Nb in pure copper, so that the alloy can be greatly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C9/00C22F1/08
Inventor 杨晓红杨柳肖鹏邹军涛姜伊辉梁淑华
Owner XIAN UNIV OF TECH
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