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Copper alloy material and preparation method thereof

A copper alloy and alloy rod technology, which is applied in the field of copper alloy materials, can solve the problems of not meeting the development requirements and the decline of the overall performance of the alloy, and achieve the effects of good surface quality, increased softening temperature, and uniform structure

Active Publication Date: 2018-08-31
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chromium-zirconium copper used for switch contacts on the market has a high-temperature softening temperature of about 550 °C. A large number of studies have shown that the coherent fcc-Cr in the alloy plays a decisive role in the strength, high-temperature stability, and conductivity of the alloy, but at higher temperatures At this time, the coherent fcc-Cr phase in the alloy is easily transformed into the incoherent bcc-Cr phase, resulting in a decline in the overall performance of the alloy, which cannot meet the development requirements of related industries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Upward continuous casting: According to Cr: 0.40 wt.%; Zr: 0.05 wt.%; Ti: 0.05wt.%; the balance is copper for copper alloy material batching, and some pure copper is selected from 1 to 2mmd pure copper sheets , Wrap Cu-Cr, Cu-Zr intermediate alloy and pure Ti with pure copper sheet; the remaining pure copper is pure copper sheet or pure copper powder, pure copper block. Put the balance of pure Cu and sufficient dehydrated charcoal into the heating furnace, smelt in the atmosphere, heat to 1200 ℃, and then put the pure copper sheet wrapped with Cu-Cr, Cu-Zr master alloy and pure Ti into the furnace. In the copper liquid, the temperature of the alloy solution in the furnace was controlled at 1140 °C for 3 minutes, and dehydrated charcoal was added twice to further reduce the burning loss of the alloy. Then the upward continuous casting is carried out to prepare the Φ=13 mm alloy rod.

[0022] (2) Cold drawing: cold draw the alloy rod obtained in step (1) to Φ=7 mm, a...

Embodiment 2

[0029] (1) It is basically the same as step (1) of Example 1, the difference is that the temperature is heated to 1250°C, and the holding temperature is 1200°C; the ingredients of the alloy are Cr: 0.40 wt.%; Zr: 0.06 wt.%; Ti: 0.06wt .%; the balance is copper and unavoidable impurities in pure copper materials.

[0030] (2) Cold drawing: cold draw the alloy rod obtained in step (1) to Φ=7 mm, and the cold drawing process is (Φ=13mm-Φ=12 mm-Φ=10 mm-Φ=9 mm -Φ=8 mm-Φ=7 mm), the total deformation of cold drawing is 71%.

[0031] (3) Solid solution: The cold deformed alloy rod obtained in step (2) was placed in a holding furnace for solution treatment, the solution temperature was 950 °C, the treatment time was 1 h, water quenched, and the obtained alloy rod was pickled.

[0032] (4) Cold drawing: cold draw the alloy rod obtained in step (3) to Φ=4.45 mm, and the cold drawing process is (Φ=7mm-Φ=6 mm-Φ=5.5 mm-Φ=5 mm -Φ=4.7 mm-Φ=4.45 mm), the total deformation of cold drawing is ...

Embodiment 3

[0037] (1) Same as step (1) of Example 1, except that the ingredients of the alloy are Cr: 0.50 wt.%; Zr: 0.06 wt.%; Ti: 0.08 wt.%; the balance is copper and cannot be used in pure copper materials Avoid impurities.

[0038] (2) Cold drawing: The alloy rod obtained in step (1) is cold-drawn to Φ=7 mm after 5 passes, and the cold-drawing process is (Φ=13 mm-Φ=12 mm-Φ=10 mm -Φ=9 mm-Φ=8 mm-Φ=7 mm), the total deformation of cold drawing is 71%.

[0039] (3) Solid solution: The cold deformed alloy rod obtained in step (2) was placed in a holding furnace for solution treatment, the solution temperature was 950 °C, the treatment time was 1 h, water quenched, and the obtained alloy rod was pickled.

[0040] (4) Cold drawing: The alloy rod obtained in step (3) is cold drawn 5 times to Φ=4.45 mm, and the cold drawing process is (Φ=7 mm-Φ=6 mm-Φ=5.5 mm- Φ=5 mm-Φ=4.7 mm-Φ=4.45 mm), the total deformation of cold drawing is 59.6%.

[0041] (5) Aging: The alloy rods obtained in step (4) w...

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Abstract

The invention discloses a copper alloy material and a method thereof. The high-thermal-stability copper alloy consists of the following components: 0.30-0.80 wt.% of Cr, 0.04-0.20 wt.% of Zr, 0.05-0.15 wt.% of Ti, impurities contained in pure copper, and the balance Cu. The preparation method of the alloy includes several steps: upward drawing continuous casting, cold drawing, solid solution, colddrawing, aging, and cold drawing. Trace elements Cr and Zr with little influence on the electrical conductivity of the copper alloy and a Ti element with significant influence on the strength of thealloy are selectively added. The addition of the Ti element is combined with deformation heat treatment, so the coherent precipitated phase can be stabilized, the nucleation of a bcc-Cr phase in the aging process is inhibited, the material always has the microstructure characteristics of an fcc-Cr phase coherently precipitated with a matrix, and excellent comprehensive properties can be obtained.In the premise of guaranteeing slight reduction of the electrical conductivity of the copper alloy, the mechanical properties of the alloy are greatly improved, the tensile strength reaches 630-730 MPa, the electrical conductivity reaches 65-85% IACS, and the softening temperature is still remained at 610-660 DEG C.

Description

technical field [0001] The invention relates to a method for preparing a copper alloy material with high thermal stability by adding Ti element in combination with upward continuous casting and processing, which belongs to the field of copper alloy materials. Background technique [0002] Due to its excellent mechanical and electrical properties, such as good electrical and thermal conductivity, corrosion resistance, and high strength, copper alloys are widely used in aerospace, lead frames, high-speed electric locomotive wires, resistance welding electrodes, generator armature rotor wires, and nuclear power heat exchangers. Structural materials and functional materials in other fields have been widely used. With the development of modern science and technology and the improvement of equipment technology level, more stringent requirements are put forward for the performance of copper alloy. The most important of which is that it must have high strength, high conductivity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/03B22D11/14C22F1/08
CPCB22D11/004B22D11/145C22C1/03C22C9/00C22F1/08
Inventor 龚留奎彭怀超陈辉明谢伟滨汪航杨斌
Owner JIANGXI UNIV OF SCI & TECH
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